Download Final Program and Book of Abstracts in PDF format



List of Parallel Sessions

Day 1

A-1-I: Symposium on Geomaterials: Poromechanics and Failure-I

A-1-II: Symposium on Forward and Inverse Problems in Elasticity and Applied Mechanics

A-1-III: Symposium on Analytical and Computational Modeling of Advanced materials- II

A-2-I: Symposium on Geomaterials: Poromechanics and Failure-II

A-2-II: Symposium on Structural Health Monitoring-I

A-2-III: Symposium on Analytical and Computational Modeling of Advanced Materials- II

A-3-I: Geomechanics

A-3-II: Symposium on Structural Health Monitoring-II

A-3-III: Biomechanics

Day 2

B-1-I: Symposium on Boundary Element Method (BEM) and Meshless Method

B-1-II: Symposium on Fracture Mechanics for Cementitous Materials

B-1-III: Symposium on Soil-structure Interactions 

Day 3

C-1-I: Fluid Mechanics

C-1-II: Symposium on Smart Structure in Hazard Mitigation

C-1-III: Fracture and Damage I

C-2-I: Man-made and Natural Hazards

C-2-II: Structural Mechanics

C-2-III: Fracture and Damage II

C-3-I: Earthquake Engineering

C-3-II: Wind Engineering

C-3-III: Landslide and Flooding



Wednesday Morning January 7, 2015

Registration and Opening                                             08:15-08:45


(08:45-08:50)      Welcome Speech                                      Prof. Alex Wai, Vice President, PolyU

(08:50-09:00)      Welcome & Logistics                               Prof. K.T. CHAU, Chair, EMI 2015 HK



Session Keynote 1: Z.P. Bazant

(V322)    Chair: R. Ballarini                                [Wed. Jan 7] 09:00~9:40



Session Keynote 2: R.I. Borja

(V322)    Chair: T.F. Wong                               [Wed. Jan 7] 09:40~10:20




Refreshment Break (Common Area Outside Y301/Y302/Y303)



Parallel Session A-1-I: Symposium on Geomaterials: Poromechanics and Failure-I

(Y301)                                                   [Wed. Jan 7] 10:50~12:05


Chair: Prof. Wai Ching SUN (Columbia University)


(10:50-11:05)             9 - Micro-macro modeling of heterogeneous geomaterials with inclusion debonding

Jianfu Shao*, Wanqing Shen and Mingyao Li


(11:05-11:20)             18 - The stress analysis on the stress distributions within cylindrical disc with micro-inclusions under the Brazilian splitting test

Xuexia, Wei*, Jian Xiong and Xuezheng, Kong


(11:20-11:35)             53 - The fractal features of contact forces chains for crushable granular materials under confined compression

Yi Yang* and Y.M. Cheng


(11:35-11:50)             71 - Isothermal moisture transport in unsaturated concrete under pressure gradient

Sonagnon Medjigbodo, Abdelhafid Khelidj*, Ahmed Loukili and Marta Choinska


(11:50-12:05)             70 - Effect of mechanical damage and wetting/drying cycles on chloride ingress in non-saturated concrete

Amor Benfraj, Stéphanie Bonnet and Abdelhafid Khelidj*




Parallel Session A-1-II: Symposium on Forward and Inverse Problems in Elasticity and Applied Mechanics

(Y302)                                                  [Wed. Jan 7] 10:50~12:05


Chair: Prof. John Brigham (Pittsburg University)


(10:50-11:05)             92 - Mixed perfectly-matched-layers for transient simulation of elastic waves in 3D heterogeneous solid media

Boyoung Kim* , Jun Won Kang and Loukas Kallivokas


(11:05-11:20)             97 - Forward transient analysis of microwave propagation in heterogeneous unbounded domains using a mixed unsplit-field PML

Sangri Yi and Jun Won Kang*


(11:20-11:35)             113 - Detection and quantification of flaws in structures using Bayesian inference and XFEM

Gang Yan*, Hao Sun and Haim Waisman


(11:35-11:50)             125 - An inverse characterization algorithm utilizing direct inversion with Gappy POD initialization and the adjoint method for material characterization from limited partial-field response data

Mengyu Wang and John Brigham*


(11:50-12:05)             119 - Electrical contact resistance of fractal rough surfaces

Chongpu Zhai*, Yixiang Gan and Dorian Hanaor


Parallel Session A-1-III: Symposium on Analytical and Computational Modeling of Advanced Materials

(Y303)                                                  [Wed. Jan 7] 10:50~12:05


Chair: Prof. N. Rajapakse (Simon Fraser University)


(10:50-11:05)             116 - Hypersingularity and special integration issues in the boundary element implementation of strain gradient elasticity

Ney Dumont* and Daniel Huamán


(11:05-11:20)             132 - Effective properties of piezoelectric fiber-reinforced composites with imperfect interface

Rattanan Tippayaphalapholgu, Teerapong Senjuntichai and Yasothorn Sapsathiarn*


(11:20-11:35)             135 - Dynamic response of pavement-layered poroelastic system to moving loads

Teerapong Senjuntichai* and Yasothorn Sapsathiarn


(11:35-11:50)             140 - Analysis of generalized T-stress for impermeable cracks in 3D anisotropic piezoelectric media by weakly singular BIE method

Jaroon Rungamornrat, Weeraporn Phongtinnaboot* and Tripop Subsathaphol


(11:50-12:05)             141 - Integral formula for T-stresses of mode-I penny-shaped crack in transversely isotropic linear elastic solids

Matana Pinitpanich* and Jaroon Rungamornrat

Lunch Break (Communal Building 4/F)                                 12:05~13:30

Group Photo (Front entry, Fountain)                                   13:30~13:45


Wednesday Afternoon January 7, 2015                    


Parallel Session A-2-I: Symposium on Geomaterials: Poromechanics and Failure-II

(Y301)                                                   [Wed. Jan 7] 14:00~15:15


Chair: Prof. Jidong Zhao (HKUST)


(14:00-14:15)             73 - A DEM-Pore scale analysis on permeability evolution in porous rock: The roles of grains motion and pore geometries

Jianrong Lu*


(14:15-14:30)             84 - Experimental studies on the shear band formation in geomaterials

Shwetabh Yadav*, Christopher Saldana and Tejas Murthy


(14:30-14:45)             102 - A nonlocal multiscale discrete-continuum model for dynamics shear band propagations and ruptures in granular materials

Yang Liu, WaiChing Sun*, Zifeng Yuan and Jacob Fish


(14:45-15:00)             103 - Capturing the interplay among inherent anisotropy, non-coaxiality and strain localisation in granular media: A multiscale approach

Jidong Zhao* and Ning Guo


(15:00-15:15)             121 - Grain-scale mechanisms at the onsets of landslides

Thierry Faug and Yixiang Gan*  

Parallel Session A-2-II: Symposium on Structural Health Monitoring-I

(Y302)                                                   [Wed. Jan 7] 14:00~15:15


Chair: Prof. Ling Yu (Jinan University)


(14:00-14:15)             12 - Vibration-based damage detection in complicated column base joint by correlation calculation

Mengning Lyu*, Qingshan Yang and Siuseong Law


(14:15-14:30)             60 - Damage prognosis on end connector bolts of truss bridges

Ling Yu* and Jun-Hua Zhu


(14:30-14:45)             41 - An experimental study on structural damage detection using an improved modal strain energy method

Parviz Moradipour*, Tommy H.T. Chan and Chaminda Gallage


(14:45-15:00)             49 - Finite element model updating of bridges by using the virtual distortion method

Yang Liu*, Jun Ma Jueguang Nie and Shaoyi Zhang


(15:00-15:15)             52 - Evolutionary covariance-based multi-sensing damage detection method under white noise excitation

Jianfu Lin* and Youlin Xu


Parallel Session A-2-III: Symposium on Analytical and Computational Modeling of Advanced Materials- II

(Y303)                                                   [Wed. Jan 7] 14:00~15:15

Chair: Prof. Euclides Mesquita (University of Campinas - Unicamp)


(14:00-14:15)             142 - Multiscale analysis of dynamic failure in polycrystalline materials using the boundary element method

Andres Galvis* and Paulo Sollero


(14:15-14:30)             143 - Simulation of a vibration isolation strategy based on the response of plates embedded in transversely isotropic layered media

Euclides Mesquita* and Josue Labaki


(14:30-14:45)             148 - Micromechanical analysis of unidirectional fiber-reinforced composites

G. Bharat, Mayank Ajugia and Yogesh Desai*


(14:45-15:00)             150 - Atomic-scale finite element modelling of graphene with vacancy defects

Daniela Damasceno*, Nuwan Dewapriya, Nimal Rajapakse and Euclides Mesquita


(15:00-15:15)             127 - Sensitivity analysis of radiated sound power on an arbitrary closed surface around the radiator

Leilei Chen * and Haibo Chen



Refreshment Break (Common Area Outside Y301/Y302/Y303)


Session A-3-I: Geomechanics

 (Y301)                                                [Wed. Jan 7] 15:50~17:05


Chair: Prof. Jianfu Shao (University of Lille)


 (15:50-16:05)           10 - A micromechanical damage model for time-dependent behavior of quasi-brittle geomaterials

Christian Bikong, Dashnor Hoxha and Jianfu Shao*


(16:05-16:20)             134 - The method of universal meshes and its application to hydraulic fracturing simulations

Yongxing Shen*, Ramsharan Rangarajan, Maurizio M. Chiaramonte, Michael J. Hunsweck and Adrian J. Lew


(16:20-16:35)             14 - Bond strength of PCC pavement repairs using metakaolin-based geopolymer concrete

Hani Alazani and Mijia Yang*


(16:35-16:50)             16 - The analytical solution for stress distributions within hollow spheres under compression between two flat loading platens

Xuexia Wei* and Zhoumi Wang


(16:50-17:05)             17 - The stress analysis on the stress distributions within layered spheres under the diametral point load strength test

Zhoumi Wang* and Xuexia Wei 

Session A-3-II: Symposium on Structural Health Monitoring-II

 (Y302)                                                [Wed. Jan 7] 15:50~17:05


Chair: Prof. Tommy Chan (Queensland University of technology)


(15:50-16:05)             61 - Structural damage detection based on cloud computing

Ling Yu* and Jing-Chun Lin


(16:05-16:20)             89 - Parameter estimation of Bouc-Wen Hysteresis model using Extended and Unscented Kalman filtering approach

Subhamoy Sen* and Baidurya Bhattacharya


(16:20-16:35)             94 - Evaluation of self-healing in the mortar by nonlinear acoustic waves

Ismail Yousfi*, Zoubeir Lafhaj and Richard Gagne


(16:35-16:50)             146 - Correlation function based structural damage detection

Yong Xia* , Ping-he Ni and Siu-seong Law


(16:50-17:05)             57 - Effects of temperature and humidity on modal properties of a suspension bridge

Lixin Wang*, Jiajian Zhu, Hui Jiang and Xianren Zhao


Session A-3-III: Biomechanics

 (Y303)                                                [Wed. Jan 7] 15:50~17:05


Chair : Prof. Jackson Kong (City University of Hong Kong)


 (15:50-16:05)           144 - A multi-scale finite element model for the analysis of human spine: from organ to extra-cellular level

Jackson Kong*


(16:05-16:20)             26 - Effects of disc degeneration of the superior adjacent segment on the stress of the corresponding segment after lumbar fusion

Cheol-Ho Moon*, Kyoung-Tak Kang, Ho-Joong Kim and Heoung-Jae Chun


(16:20-16:35)             27 - Biomechanical analysis of fusion segment rigidity upon stress at both the fusion and adjacent segments - A comparison between unilateral and bilateral pedicle screw fixation

Kyoung-Tak Kang*, Ho-Joong Kim and Heoung-Jae Chun


(16:35-16:50)             28 - The biomechanical analysis of the association between facet joint orientation and disc stress in the fusion model

Heoung-Jae Chun*, Kyoung-Tak Kang and Ho-Joong Kim


(16:50-17:05)             39 - The effect of varus malalignment on stress of ligaments in total knee replacement using finite element analysis

Seol Baek* , Kyoung-Tak Kang, Ho-Joong Kim, and Heoung-Jae Chun


Elasticity Committee Meeting V316                                    17:30-18:30


Reception/Icebreaker                                                18:30~20:30

Chan Sui Kau and Chan Lam Moon Chun Square 陳瑞球林滿珍伉儷廣場



Thursday Morning January 8, 2015

Registration                                                          08:15-09:00



Session Keynote 3: A.H.D. Cheng

(V322)    Chair: J. Brigham                                 [Thu. Jan 8] 09:00~9:40



Session Keynote 4: R. Ghanem  

(V322)    Chair: N. Rajapakse                              [Thu. Jan 8] 09:40~10:20




Refreshment Break (Common Area Outside Y301/Y302/Y303)




Parallel Session B-1-I: Symposium on Boundary Element Method (BEM) and Meshless method

(Y301)                                                    [Thu. Jan 8] 10:50~12:05


Chair: Prof. A.H.D. Cheng (Mississippi University)


(10:50-11:05)             24 - Solving three-dimensional elasticity by Clifford valued boundary element method

Li-Wei Liu* and Hong-Ki Hong


(11:05-11:20)             111 - A quasi-convex reproducing kernel meshfree method with application to structural vibration analysis

Dongdong Wang*, Pengjie Chen and Junchao Wu


(11:20-11:35)             114 - Modified version of regularized meshless method

Seng-Wei Lin*, Ren Liu, and Kue-Hong Chen


(11:35-11:50)             118 - Singular boundary method and its application on underground engineering

Zhuojia Fu* and Wen Chen


(11:50-12:05)             158 - The dynamic analysis in an arbitrary area of saturated soil subjected to a concentrated force and numerical implementation by BEM

Boyang Ding* and Jiaqi Jiang


Parallel Session B-1-II: Symposium on Fracture Mechanics for Cementitous Materials

(Y302)                                                    [Thu. Jan 8] 10:50~12:05  


Chair: H.W. Reinhardt (University of Stuttgart)


(10:50-11:05)             13 - Progressive failure of fiber reinforced pervious concrete with inclusion of cohesive interface modeling

Lutfur Akand and Mijia Yang*


(11:05-11:20)             87 - Size effect on Double-K fracture parameters in concrete

Rena C. Yu*,  José Joaquín Ortega-Parreño and Gonzalo Ruiz


(11:20-11:35)             152 - Influence of alkalis on fracture toughness of some sensitive rocks

H.W. Reinhardt* and Oliver Mielich


(11:35-11:50)             155 - Behavior of hybrid fiber pseudo-ductile cementitious composites (PDCC) in tension, bending and shear

Jing Yu* and Christopher Leung


(11:50-12:05)             157 - Analysis of three-point bending tests of FRP-bonded notched concrete

Jian-Guo Dai*, Jian-Jun Zheng and Xing-lang Fan


Parallel Session B-1-III: Symposium on Soil-structure interactions  

(Y303)                                                    [Thu. Jan 8] 10:50~12:05 


Chair: Prof. Andy Leung (The Hong Kong Polytechnic University)


(10:50-11:05)             23 - Studies on seismic response analysis of deepwater vibration-isolated foundation

Shaolei Huo*, Xiaojuan Li, Guoliang Dai and Weiming Gong


(11:05-11:20)             30 - Elastic-plastic solutions for laterally loaded piles in multilayered soil deposits by transfer matrix method

Mingxing Zhu* and Weiming Gong


(11:20-11:35)             42 - Interaction of a rigid disc with a transversely isotropic tri-material full-space under a prescribed horizontal harmonic vibration

Ladan Mohtati*, Mohammad Rahimian and Morteza Eskandari-Ghadi


(11:35-11:50)             43 - Experimental study on caisson-pile composite foundation under horizontal load

Lei Wang*, Weiming Gong and Baogang Mu


(11:50-12:05)             76 - Failure of cast-iron tunnel in saturated soil subjected to internal blast loading

Yuzhen Han and Huabei Liu*


Lunch Break ( Staff Club, Communal Building 5/F)

Buffet                                                        12:05~14:00


Thursday Afternoon January 8, 2015  (free afternoon)




Friday Morning January 9, 2015                    


Registration                                                         08:15-09:00



Session Keynote 5: P.L.F. Liu

(V322)    Chair: A.H.D. Cheng                             [Fri. Jan 9] 09:00~9:40


Session Keynote 6: Y.L. Xu

(V322)    Chair: T. Fu                                    [Fri. Jan 9] 09:40~10:20



Refreshment Break (Common Area Outside Y301/Y302/Y303)


Parallel Session C-1-I: Fluid Mechanics

(Y301)                                                    [Fri. Jan 9] 10:50~12:05


Chair: Prof. Philip L.F. Liu (Cornell University)


(10:50-11:05)             33 - A fully dynamic Navier-Stokes numerical model to simulate the violent two-phase flows in a dropshaft

Zhiyu Shao and Scott Yost*


(11:05-11:20)             139 - A laboratory study of gradually varied flow through semi-rigid emergent blade-type vegetation

Afis Olumide Busari* and Chi Wai Li


(11:20-11:35)             145 - Large eddy simulation of open channel flows over partially-distributed submerged vegetation patch

Xufeng Yan*, Onyx Wing-hong Wai and Chi-wai Li


(11:35-11:50)             25 - Two-dimensional solute transport with varying velocity field

Mritunjay Kumar Singh*, Pintu Das and Vijay P. Singh


(11:50-12:05)             99 - Investigating solitary wave forces on coastal twin bridge decks

Guoji Xu and Chunsheng Cai*



Parallel Session C-1-II:  Symposium on Smart Structure in Hazard Mitigation

(Y302)                                                    [Fri. Jan 9] 10:50~12:05


Chair: Prof. Tat FU (University of New Hampshire)


(10:50-11:05)             11. Considerations towards the application of low-frequency locally resonant metamaterials for earthquake hazard mitigation

Alexandros Lalas, Vasilis K. Dertimanis*, Ioannis Antoniadis and Eleni Chatzi


(11:05-11:20)             34 - FBG sensor design for bridge scour monitoring

Xuan Kong* , Siu Chun Michael Ho , Gangbing Song and C. S. Cai


(11:20-11:35)             35 - Determination of optimal location of actuators and sensors for seismic control of building structures

Jia He*, You-Lin Xu , Chao-Dong Zhang and Xiao-Hua Zhang


(11:35-11:50)             47 - Passive and active control with double skin façade mass dampers

Tat Fu and Rui Zhang*


(11:50-12:05)             48 - Analyzing a damaged bridge at its pre- and post-repair states

Tat Fu*, Antonio Garcia-Palencia and Erin Bell


Parallel Session C-1-III: Fracture and Damage I

(Y303)                                                    [Fri. Jan 9] 10:50~12:05


Chair: Prof. Jie Li (Tongji University)


(10:50-11:05)             3 - Adaptive multi-grid simulation on seismic damage evolution and failure of concrete column

Bin Sun* and Zhaoxia Li


(11:05-11:20)             7 - Dynamic stress intensity factors of Mode III finite length crack in a viscoelastic medium based on fractional differential constitutive models

Runtao Zhan* and Zhaoxia Li


(11:20-11:35)             20 - A weak form quadrature element method for computation of coefficients of crack tip asymptotic fields

Minmao Liao* and An Tang


(11:35-11:50)             37 - Stable extended finite element for the modeling of localized failure in solids

Jian-Ying Wu* and Feng-Bo Li


(11:50-12:05)             51 - Damage Based Simulation of Cracking for Reinforced Concrete

Xiaodan Ren* and Jie Li


Lunch Break (Communal Building 4/F)                                 12:05~14:00


Friday Afternoon January 9, 2015                    


Parallel Session C-2-I: Man-made and Natural Hazards

(Y301)                                                   [Fri. Jan 9] 14:00~15:15


Chair: Prof. Shengzhi Wu (Lanzhou University)


(14:00-14:15)             68 - The geomechanics of frozen landfill-A new landfill remediation and resource recovery management

Walter Loo*


(14:15-14:30)             72 - Analysis and modeling of zonal disintegration around a deep excavation

Jianrong Lu*


(14:30-14:45)             104 - Detection of sinkhole formation by Brillouin time domain reflectometry (BOTDR) – A simulation study

Raphael Linker and Assaf Klar*


(14:45-15:00)             88 - Bridge scour development analysis using dynamic mesh updating technique

Wen Xiong* and C.S. Cai


(15:00-15:15)             151 - Numerical modeling of sand transport in a turbulent boundary layer

Shengzhi Wu*, Bo Yang and Ming Lei


Parallel Session C-2-II: Structural Mechanics

(Y302)                                                   [Fri. Jan 9] 14:00~15:15

Chair: Prof. Matthew Gilbert (University of Sheffield)

 (14:00-14:15)             40 - Comparison between instrumented posterior fixation system in two-segments with rigid and semi-flexible rods using finite element analysis

Beom-Chul Park*, Kyoung-Tak Kang, Ho-Joong Kim and Heoung-Jae Chun


(14:15-14:30)             45 - Systematic automation of the yield-line method of analysis for slabs and plates

Matthew Gilbert*, Linwei He, Colin Smith and Canh Le


(14:30-14:45)             46 - Rationalization of truss designs generated using layout optimization

Linwei He* and Matthew Gilbert


(14:45-15:00)             75 - Simple and accurate eight-noded solid-shell elements with explicit element stiffness matrix based on quasi-conforming element technique

Yu Wang* and Guangyu Shi


(15:00-15:15)             15 - Bridge settlement criteria based on reliability analysis of close-to-reality modeling results

Mijia Yang* and Shawn Parks




Parallel Session C-2-III: Fracture and Damage II

(Y303)                                                   [Fri. Jan 9] 14:00~15:15

Chair: Prof. Kun Zhou (Nanyang Technological University)


(14:00-14:15)             83 - A damage model for fatigue analysis of concrete

Junsong Liang and Jie Li*


(14:15-14:30)             156 - Experimental investigation on dynamic strength and fracturing properties of prismatic marble specimen containing a single flaw by SHPB

Tao Zhou*, Xibing Li and Diyuan Li


(14:30-14:45)             74 - Cohesive– frictional interface constitutive model

Jianrong Lu*


(14:45-15:00)             131 - Fracture analysis of heterogeneous materials

Rongbing Wei and Kun Zhou*


(15:00-15:15)             110 - Computational modeling of degradation by reaction-diffusion

Shawn Chester*




Refreshment Break (Common Area Outside Y301/Y302/Y303)



Session C-3-I: Earthquake Engineering

 (Y301)                                            [Fri. Jan 9] 15:50~17:05

Chair : Prof. Zengping Wen (Institute of Geophysics)


(15:50-16:05)             21 - The importance of soil liquefaction potential assessment in earthquake engineering

Muhsin Elie Rahhal*


(16:05-16:20)             90 - Nonlinear seismic analysis of a three-dimensional unsymmetrical reinforced concrete structure

Hyun-Kyu Lim*, Jun Won Kang and Ho-Seok Chi


(16:20-16:35)             107 - Dense gas from deep crust as the cause of tsunami during earthquake

Zhongqi Quentin Yue*


(16:35-16:50)             109 - Development of seismic fragility surfaces for reinforced concrete building based earthquake source, wave propagation path and site condition

Zengping Wen*, Chao Xu and K.T. Chau


(16:50-17:05)             128 - A new stochastic simulation approach for structural reliability analysis under earthquake-induced tsunamis

Sai Hung Cheung* and Zhe Shao


Session C-3-II: Wind Engineering

 (Y302)                                            [Fri. Jan 9] 15:50~17:05   

Chair : Prof. C.W. Li (Hong Kong Polytechnic University)


(15:50-16:05)             8 - Self-starting performance of vertical axis wind turbines using variable pitch angle technique

Yixin Peng* and You-Lin Xu


(16:05-16:20)             38 - Simulation of aerodynamic forces of vehicles in cross wind

Jiexuan Hu*, C.S. Cai and Yan Han


(16:20-16:35)             82 - Reliability analysis of tall steel buildings subject to wind-induced serviceability criteria

Xiaokang Zou*, Adia Bodden and Qian Wang


Session C-3-III: Landslide and Flooding

 (Y303)                                            [Fri. Jan 9] 15:50~17:05   

Chair : Prof. Xuexia Wei (Beijing Institute of Technology)


(15:50-16:05)             106 - Dense gas from deep traps as the cause of large rapid and long-runout landslides

Zhongqi Quentin Yue*


(16:05-16:20)             2 - Slope stability analysis under saturated or unsaturated seepage flow

Zongyuan Ma*, Zhenhua Wang and Faning Dang


(16:20-16:35)             105 - Experimental and numerical study of fluid-particle flow

Lu Jing*, Fiona C.Y. Kwok, Andy Y.F. Leung and Yung-ming Cheng


(16:35-16:50)             130 - A new hybrid neural network for downstream daily river discharge forecasting

Xiao Yun Chen*, Kwok Wing Chau and Wen Chuan Wang


(16:50-17:05)             79 - Evaluation of dynamic soil properties effects on a landslide

Muhsin Elie Rahhal*, Akram Ghossoub and Anthony Fayad


* presenter


EMI Review Meeting V316                                         17:30-18:30


Banquet                                                          18:30~20:30

Colour Crystal Restaurant (Tsim Sha Tsim East) (To be Confirmed)



Confirmed keynote lecturers are

Title of keynote:  Why fracking works and how to optimize it

Prof. Zdenek Bazant
McCormick Institute Professor, Walter P. Murphy Professor of Civil and Environmental Engineering, Mechanical Engineering and Material Science and Engineering, Northwestern University, USA

Abstract: The astonishing success of the U.S. industry with horizontal drilling and hydraulic fracturing, aka fracking, drastically improves the energy prospects. Many aspects of fracking, including the propagation of a single fluid-pressurized crack, are well understood by now. However, the geometry and evolution of the crack system still remains an enigma and mechanicians wonder: Why fracking works? The answer must be sought in the stability of interacting hydraulic cracks. Based on the known gas permeability of shale, on the known percentage of gas extraction from shale stratum and on two key features of the measured gas outflow which are 1) the time to peak flux and 2) the halftime of flux decay, it is shown that the crack spacing must be only about 10 cm. Attainment of such a small spacing requires preventing localization in parallel crack systems. This is a stability problem analogous to a system of parallel cooling or shrinkage cracks studied long ago. Formulated is a hydro-thermal analogy which makes it possible to transfer solutions from cooling to hydraulic cracks. From this analogy, and from new numerical solutions of stability of a system of pressurized circular equidistant vertical cracks, it is concluded that the localization instability can be avoided if the hydraulic pressure profile along the cracks can be made almost uniform. Whether it can depends on the rate and history of pumping of the fracking water. Of course, the proppants, gellants and acids in the fracking water play a role, too. Preventing localization in a vast system of fluid-filled pressurized cracks and open joints is, from the fracture mechanics viewpoint, what makes fracking work. Since currently only <15% of gas gets recovered from the shale strata, the localization is being prevented only partially. More extensive suppression of localization will be one way to increase the gas extraction percentage. This will also reduce the amount of fracking water per unit amount of extracted gas and thus mitigate the environmental footprint of fracking.

Reference:    Bažant, Z.P., Salviato, M., Chau, Viet T., Viswanathan, H. and Zubelewicz, A. (2014). "Why fracking works." ASME J. of Applied Mechanics 81 (Oct.), 101010-1---101010-10.  p.14) and 64, 236--248.

Bio: Born and educated in Prague (Ph.D. 1963), Bažant joined Northwestern in 1969, where he has been W.P. Murphy Professor since 1990 and simultaneously McCormick Institute Professor since 2002; and Director of Center for Geomaterials (1981-87).  He was inducted to NAS, NAE and Am. Acad. of Arts & Sci.; to the national academies of Italy, Austria, Spain, Czech Rep. and Lombardy; to Academia Europaea and Eur. Acad. of Sci. & Arts. Honorary Member: ASCE, ASME, ACI. Received 7 honorary doctorates (Prague, Karlsruhe, UC Boulder, Milan, Lyon, Vienna, Ohio State); Honors: ASME Timoshenko, Nadai and Warner Medals; ASCE von Karman, Newmark, Biot and Croes Medals and Lifetime Achievement Award; SES Prager Medal; RILEM L'Hermite Medal; Exner Medal (Austria); Torroja Medal (Madrid); etc.  He is Illinois Registered Structural Engineer. Authored six books: Scaling of Structural Strength, Inelastic Analysis, Fracture and Size Effect, Stability of Structures, Concrete at High Temperatures, and Concrete Creep. Citations: 39,600 (on Google, Aug 2014, minus ~10% self-cit.), H-index: 96, i10 index: 464. He is one of the original top 100 ISI Highly Cited Scientists in Engineering (of all fields); www.ISIhighlycited.com. Home: http://cee.northwestern.edu/people/bazant/.   

Title of keynote:  Multiscale poromechanics accommodating double porosity and shear band

Prof. Ronaldo I. Borja
Professor, Stanford University, USA

Abstract:  Geomaterials with aggregated structure or containing fissures often exhibit a bimodal pore size distribution that can be viewed as two coexisting pore regions of different scales. The concept of double porosity enables continuum modeling of such materials by considering two interacting pore scales satisfying relevant conservation laws. When these materials deform, they undergo localized deformation and develop a shear band, which may be accompanied by either compaction (compactive shear band) or dilation (dilative shear band) depending on the stress state and current density of the material. The resulting mode of deformation may be characterized as a combination of a coarse-scale field and a fine-scale field. In this work, we develop a thermodynamically consistent framework for hydromechanical modeling of unsaturated flow at multiple scales. With an explicit treatment of the two pore scales, conservation laws are formulated incorporating an effective stress tensor that is energy-conjugate to the rate of deformation tensor of the solid matrix. A constitutive framework is developed based on energy-conjugate pairs identified in the first law of thermodynamics, which is then incorporated into a three-field mixed finite element formulation. 

Bio: Ronaldo Borja works in theoretical and computational solid mechanics, geomechanics, and geosciences. At Stanford University, he teaches an undergraduate course in geotechnical engineering, a graduate course in mechanics and the finite element method, and two doctoral level courses in computational plasticity and computational poromechanics. His research includes the development of multi-scale discontinuity framework for crack and fracture propagation utilizing the strong discontinuity and extended finite element methods; solution techniques for multi-physical processes such as coupled solid deformation-fluid diffusion in saturated and unsaturated porous media; stabilized finite element methods for solid/fluid interaction and nonlinear contact mechanics; and nanometer-scale characterization of the inelastic deformation and fracture properties of shales. Ronaldo Borja is the author of a textbook entitled Plasticity Modeling and Computation published by Springer. He serves as co-editor of two leading journals in his field, the International Journal for Numerical and Analytical Methods in Geomechanics and Acta Geotechnica, and as co-editor of a book series, the Springer Series in Geomechanics and Geoengineering.

Title of keynote: Poroelasticity: A physically based, variational energy approach for coupled mechanical, hydraulic, thermal, viscoelastic, dynamic, and chemical effects

Prof. Alexander H.D. Cheng
Professor and Dean, University of Mississippi, USA

Abstract: Porous materials are found in nature as inanimate bodies such as sand, soil, and rock, in living bodies such as plant and animal tissue, or as man-made materials. These materials can look much different in their appearances due to their origin, but the underlying physical principles governing their mechanical behaviors can be the same. This talk covers the mechanics of porous materials infiltrated with a fluid (poromechanics), with a focus on the linear theory (poroelasticity). The theory is presented both from an intuitive, phenomenological approach at the bulk continuum level, and a thermodynamics based variational energy approach at the micromechanical level. The physical mechanisms covered extend from the quasi-static theory of poroelasticity to poroelastodynamics, poroviscoelasticity, porothermoelasticity, and porochemoelasticity.

Bio: Alexander Cheng’s research interest covers poromechanics, groundwater, saltwater intrusion, boundary element method, meshless collocation method, and nanomechanics. He has authored 4 books, including one on ‘Modeling Groundwater Flow and Contaminant Transport” with Jacob Bear, and more than 150 journal articles on these subjects. He had previously served as the President of Engineering Mechanics Institute, ASCE, and Vice President of Academic Affairs of American Institute of Hydrology. He is the Editor-in-Chief of Engineering Analysis with Boundary Elements (Elsevier), Associate Editor of Transport in Porous Media (Springer), International Associate Editor of Journal of Mechanics (Cambridge Univ. Press), and previously Associate Editor for Journal of Engineering Mechanics and Journal of Nanomechanics and Micromechanics (ASCE). He was the recipient of the Maurice A. Biot Medal and the Walter L. Huber Civil Engineering Research Prize of ASCE, and twice the Basic Research Award of the U.S. National Committee for Rock Mechanics. He obtained his Ph.D. from Cornell University, and is currently Dean of Engineering and Professor of Civil Engineering at the University of Mississippi.

Title of keynote: Risk Assessment for Complex Systems

Prof. Roger Ghanem
Gordon S. Marshall Professor of Engineering Technology
University of Southern California, USA

Abstract: A hallmark of modern society is the inter-dependence between many of its constituents and the complexity of its failure modes. In many instances, such as encountered following the Deepwater Horizon oil spill, or the Fukushima Daiichi nuclear accident, a complex interplay between natural, man-made, and societal factors augmented the event itself with socio-economic and political factors on a global scale. A cursory look at the current grand challenges facing today's global society indicates a rising trend in this class of problems at the interface of science, technology, nature, and human well-being. Understanding and characterizing extreme events in such settings requires added attention as the complexity of interactions is likely to yield emergent phenomena and non-convex safety sets. Furthermore, in such situations, it is typical that relevant data is acquired using several modalities to which different levels of credibility may be attached. Even knowledge about various components of these complex system is often accumulated along different logical paths which may include causality, functional dependence or correlational studies with longitudinal or cross-sectional surveys.

A new way of characterizing the weight of evidence in observations, and a new way of transporting that evidence into inference and action is needed to simultaneously address the severe implications of failure and the limitation of resources typical in these problems.

This talk will address the development of predictions that are sufficiently credible for complex failure mechanisms. The challenge is one of understanding the constraints provided by the system, its interfaces and its observers while providing representations of data and of uncertainty that are robust enough to capture these constraints. These developments will be described using case studies that pertain to some of the applications discussed above.

Roger Ghanem works on uncertainty quantification and probabilistic modeling. He received his PhD in Civil Engineering at Rice University and is currently Professor in the Departments of Civil & Environmental Engineering and Aerospace & Mechanical Engineering at USC. Ghanem is Past President and current member of the Board of Governors of EMI. He is founding chair of the Uncertainty Quantification (UQ) committee in USACM and a founding officer of the UQ SIAG in SIAM. Ghanem has published widely on various issues in UQ including modeling, theory, algorithms, and applications. He serves on the editorial board of several international journal


Title of keynote: Water Waves through Coastal Aquatic Forest Areas

Prof. Philip L.-F. Liu
The Class of 1912 Professor, Cornell University, USA

Abstract: In this talk a semi-analytical theory of water wave propagation through aquatic vegetation is presented to examine the cases where the vegetated area has a finite extent. A mathematical model for small-amplitude periodic waves propagating through a lattice-like array of vertical cylinders within a finite region is developed. Assuming periodic lattice configuration and strong contrast between the cylinder spacing and the typical wavelength, the multi-scale perturbation theory of homogenization is employed to derive the effective equations governing the macro-scale wave dynamics and the boundary-value problem of micro-scale flows within a unit cell. The constitutive coefficients in the macro-scale effective equations are computed from the solution of the micro-scale boundary-value problem, which is driven by the macro-scale pressure gradients. Furthermore, a bulk eddy viscosity is determined by balancing the time-averaged rate of dissipation and the rate of work done by wave forces on the forest, integrated over the entire forest. The wave forces are modeled by the Morison-type formula, in which the drag coefficient formula is constructed based on experimental data by Hu et al. (2014). The theory was checked with the experimental data from Hu et al. (2014) for wave decay through a forest strip, in which waves are of normal incidence. The agreement between the theory and experiment is very good. To further check the theory, a new set of experiments for periodic waves propagating through a circular shape forest was conducted. The Reynolds numbers for these experiments are in the same range as those of Hu et al. (2014). Because of the circular shape, analytical solutions of the macro-scale problem can be obtained. Again, good agreement between the theory and experimental data is observed. No additional fitting coefficient is needed in the theory/experiment comparison. Finally, a general solution approach is developed for the cases where the vegetated areas have arbitrary shape. 

Bio: Prof. Philip L.-F. Liu is a Professor at Cornell University and is affiliated with the School of Civil and Environmental Engineering (CEE), the Center of Applied Mathematics and the field of Computational Sciences. Currently Dr. Liu is also the holder of the Kwoh-Ting Lee Chair Professorship at the National Central University, Taiwan, where he is affiliated with the Institute of Hydrological and Oceanic Sciences.  Prof. Liou got his PhD from Massachusetts Institute of Technology. Liu has been the Director of the School of CEE since July 1, 2009.  Liu is an internationally-recognised, front-line researcher in the fields of water wave theory, tsunami dynamics, wave-breaking processes, sediment transport and the interaction of waves with structures. Since the 1990s, he has pioneered the development of a unified mathematical model of wave behaviour that covers a wide range of nonlinearity and frequency dispersion. His eminence in the field of nonlinear waves was recognised by his co-option to the US National Science Foundation (NSF) Task Force formed to assess the causes and consequences of the 2004 Asian tsunami and to the National Research Council (NRC) Committee to review the Louisiana Coastal Protection and Restoration (LACPR) Program. Liu has ppubl;ished 200 plus papers and co-authored one book and co-edited more than 10 books. Liu is a Fellow of the American Geophysical Union (AGU) and the American Society of Civil Engineers (ASCE). He has received many academic awards, including the prestigious ASCE Walter L. Huber Civil Engineering Research Prize (1978), the J. S. Guggenheim Fellowship (1980), the ASCE John G. Maffatt & Frank N. Nichol Harbor and Coastal Engineering Award (1997), the International Coastal Engineering Award ASCE (2004) and the Alexander von Humboldt Research Award (2009).


Title of keynote: SHMS-based prognosis for fatigue damage of a suspension bridge

Prof. You-lin Xu
Chair Professor, The Hon
g Kong Polytechnic University, Hong Kong, CHINA

Abstract: Many innovative long-span suspension steel bridges have been built around the world. When these bridges are constructed in wind-prone regions, they suffer considerable buffeting-induced vibration. The frequent occurrence of such a buffeting response at relatively large amplitude may cause fatigue damage to steel members and their connections. Long-span suspension bridges also carry highway and/or railway loadings, and these dynamic loadings affect the fatigue life of the bridge. The fatigue damage prognosis (FDP) of the bridges under multiple fatigue loadings is therefore necessary for bridge maintenance and safety, but it is a challenging task due to the complexity of structural systems, randomness in fatigue loadings and complicated mechanisms of fatigue damage.    

Long-term structural health monitoring systems (SHMS) have been developed in recent years to measure the dynamic loadings and structural responses of long-span suspension bridges, and to assess their functionality and safety while tracking the symptoms of operational incidents and potential damage. SHM technology thus provides a promising means of tackling challenging FDP issues. However, current research has tended to separate the SHM and FDP of long-span suspension bridges, even though their integration has been advocated in other fields to achieve a reliable and robust FDP.

This paper takes the Tsing Ma suspension bridge in Hong Kong as an example to manifest how to conduct the fatigue prognosis for the bridge based on the information recorded by the SHMS. The SHMS installed in the Tsing Ma Bridge is briefly introduced first. How to use the SHMS for investigating highway loading, railway loading, and wind characteristics is then presented. To undertake the fatigue analysis of the multi-loading long-span suspension bridge, a dynamic stress analysis of the bridge under multiple types of dynamic loads shall be conducted. A comprehensive framework based on the finite element method is therefore developed to fulfill this task. The SHMS-based prognosis for fatigue damage of the bridge under combined highway, railway and wind loadings is finally discussed. The results from the case study indicate that the proposed bridge fatigue prognosis method is feasible and can be used in practice for long-span suspension bridges with SHMS.The results also indicate that it is necessary to consider the combined effect of multi-loads in the fatigue analysis of long-span suspension bridges.

Bio: Professor You-Lin Xu received his PhD degree from University of Sydney, Australia. He is Chair Professor of Structural Engineering, Founding Director of Research Centre for Urban Hazards Mitigation, and Dean of Faculty of Construction and Environment of The Hong Kong Polytechnic University. He has conducted research and consulting in structural engineering over three decades with special interests in wind engineering, structural health monitoring, and structural vibration control. He has been engaged in many high-level projects, including the projects on the Tsing Ma Bridge and the Stonecutters Bridge in Hong Kong, the CCTV Tower in Beijing and Shanghai Tower in Shanghai. He has published over 200 SCI journal papers and served in various capacities in several international associations and international journals, including Associate Editors of Journal of Bridge Engineering, ASCE, and Journal of Civil Structural Health Monitoring. He has received several prestigious awards, including the 2006 Croucher Senior Research Fellowship, the 2010 Qian Ling Xi Computational Mechanics Award, and the 2012 Robert H. Scanlan Award in recognition of his outstanding research achievements. He wrote two books “Structural Health Monitoring of Long-Span Suspension Bridges” and “Wind Effects on Cable-Supported Bridges” published by Taylor & Francis and John Wiley & Sons respectively. He is Fellow of The Hong Kong Institution of Engineers, Fellow of American Society of Civil Engineers, Fellow of Engineering Mechanics Institute of USA, and Fellow of Institution of Structural Engineers of UK.



Key Dates


Contact Information

  • Mini-Symposium Proposal
    Deadline: May 15, 2014
  • Abstract Submission (revised)
    Deadline: August 31, 2014
  • Notification of Abstract Acceptance (revised)
    Deadline: September 21, 2014
  • Early Bird Registration
    Deadline: September 31, 2014
  • Online Registration
    Deadline: December 7, 2014

Chair: Professor KT Chau

Department of Civil & Environmental Engineering

The Hong Kong Polytechnic University, Yok Choi Road, Hung Hom, Kowloon, Hong Kong, China

Telephone: (852) 2766-6015
E-mail: 1st-int.emi2015@connect.polyu.hk