Numerical Models in Geomechanics : Proceedings of the 8th International Symposium Numog VIII, Rome, Italy, 10-12 April 2002 Book

	Preface	XIII
1.	Constitutive Models for Geomaterials
1.1	Mathematical formulation
	On the incremental behaviour of granular soils	3
	Micromechanical model for softening and dilatation of rock joints	11
	On failure criteria incorporating a scalar anisotropy parameter	19
	A new macroscopic approach for brittle damage: anisotropy and unilateral effect	27
	A constitutive model for North Sea Chalk: application to reservoir compaction and waterflooding	33
	Modelling principal stress rotation effects with multilaminate type constitutive models for clay	41
	A 3-D micromechanical modeling of anisotropic damage: microcracks closure effects and coupling with friction	49
	Equivalence between incremental and hypoplastic constitutive laws: pertinence of theoretical results with regard to experimental ones	55
	Stress-induced anisotropy in random assemblies of oval granules	61
	An advanced multilaminate model for clay	67
	A constitutive model of anisotropic behavior of soft sedimentary rock	75
	A constitutive model for anisotropic and strain-softening clay	79
	A critical review of the State Boundary Surface concept in light of advanced constitutive modelling	85
1.2	Experimental verification and validation
	Experimental investigation of plane strain behavior of Georgia kaolin	93
	Anisotropy of reconstituted POKO clay	99
	Calibration of soil models by inverse analysis	107
	Comparison of two approaches for modelling anisotropy of soft clays	115
	Numerical implementation of a constitutive model based on interpolation between experimental data	123
	Prediction of soil parameters using MLPBP artificial neural network	129
	Importance of principal deviatoric strain increment ratios of sand	135
	Enhancement of data for training neural network based constitutive models for geomaterials	141
2.	Modelling of Instability and Strain Localization in Geomaterials
	Effect of slenderness ratio on shear banding in true triaxial tests on sand	149
	Continuous and discrete analyses of failure in granular media	155
	The application of a strong-discontinuity FEM to the analysis of strain localization induced by underground openings	163
	Bifurcation analysis for boundary value problems involving a second gradient model	171
	Application of localization concepts to discontinuous water content patterns in unsaturated media	179
	Instability and strain localization analysis of elasto-viscoplastic normally and overconsolidated clays	185
	Evolution of shear localization in earth pressure problems	191
	Numerical analysis of toppling failures in jointed rock slopes	197
3.	Numerical Algorithms: Formulation and Performance
	Real-time soil modeling for machine-medium interaction in virtual reality	207
	Numerical integration of elastoplastic constitutive equations for geomaterials with extended hardening rules	213
	Parallel finite element analysis of coupled problems	219
	Performance of different finite element families in plastic limit analyses	227
	Simulation of the behaviour of deep geological repositories--some computational challenges	235
	Finite elements with artificial intelligence	241
	Simulating the 3D stress-strain response of Canadian river sand via dynamic neuro-mechanistic approach	247
	Modelling of a footing behaviour using an Adaptive Neuro-Fuzzy Inference System	253
	Study of the influence of finite element mesh refinement on the calculated bearing behaviour of a piled raft	259
	A study of common simplifications used in three dimensional finite element analyses	265
	Computational aspects of a unified critical state model for clay and sand	271
	An implicit integration algorithm for elastoplasticity of interface element	279
	Adaptive neuro-fuzzy inference models for geotechnical problems	285
4.	Modelling of Transient, Coupled and Dynamic Problems
	Numerical modeling of hydro-mechanical fracture behavior	293
	A coupled erosion-stress deformation model for sand production using streamline upwind finite elements	301
	A multiple-porosity model of contaminant transport in fractured soils	311
	Thermo-elastic consolidation of non-homogeneous soils by boundary elements	317
	Modeling of elastoplastic damage in unsaturated concrete	323
	Viscous boundary for transient analyses in porous media	329
	A stochastic approach with BEM for geotechnical analysis in earthquake engineerin	337
	Dynamic fracturing of hard rocks by blasting	345
	Computation of ground waves due to vibro-driving of piles	353
5.	Application of Numerical Techniques to Practical Problems
5.1	Tunnels and underground structures
	On a smart use of 3D-FEM in tunnelling	361
	Analysis of the hydration of a bentonite seal in a deep radioactive waste repository	367
	Fuzzy inference system for the safety evaluation and the reinforcement design of tunnel excavation	373
	Numerical and analytical studies of the effects of compensation grouting	379
	Liquefaction and dynamic FE analysis of an immersed tunnel case	385
	The prediction of ultimate lateral soil pressure on shallow pipelines in trench cohesive backfill	393
	Numerical modelling of underground structures taking into account the viscoplastic behaviour and rock damage	399
5.2	Foundations, piles and anchors
	Weathering induced subsidence of a circular foundation	407
	Ultimate loads on square footings	415
	On spatial averaging in reliability computations of shallow foundations	419
	FEM modeling of embedded foundation-influence of depth on the settlement and the bearing capacity	425
	The undrained inclined load capacity of shallow foundations after consolidation under vertical loads	431
	Three-dimensional finite element analysis of combined loading of skirted foundations on non-homogeneous clay	439
	Finite element limit analysis of strip footings under inclined loading	445
	Behaviour of a footing on a partially saturated soil	451
	A failure surface for the bearing capacity of circular footings on saturated clays	457
	Dynamic soil stiffnesses for partially embedded foundations: formulation with simplified boundary differential equations	463
	Bearing capacity analysis of anisotropic and strain-softening clays	469
	Sensitivity analysis of nonlinear behaviour of laterally loaded piles	475
	Investigation of pile group in soft clay subjected to horizontal loading--sensitivity analysis	481
	Numerical analyses of a piled retaining wall--a case history	487
	Semi-analytical solutions for vertically loaded piles in clay/weak rocks	493
	Displacements of the anchored diaphragm walls during consolidation process	501
	Pullout capacity of circular plate anchor in clay--FE analysis	507
5.3	Excavations, slopes and embankments
	Systematic update of a numerical model of a deep excavation using field performance data	517
	Numerical simulation and stress path analyses of creep behaviour in excavation problems	523
	Numerical analysis of deep excavations reinforced by piles	529
	Influence of anisotropic spatial variability on slope reliability	535
	SPH numerical simulation of debris flows and avalanches	541
	Reliability analysis of rock slopes using theory of fuzzy sets	547
	The effect of a kinematic yield surface on the predicted behaviour of an embankment	553
	Stability analysis for embankments prone to uplift induced failure	561
	A comparison between observed and predicted deformations of Winscar dam	565
	3-D SFEM based reliability analysis of a gravity dam on layered rock	573
	Comparison of the measured and computed performance of a propped diaphragm retaining wall in Egypt	579
5.4	Simulation of laboratory/field tests
	Numerical modelling of scale effects in bender-based pulse tests	589
	Numerical interpretation of continuously cycled bender element tests	595
	Effect of in-situ soil properties on piezocone penetration test measurements	601
	Hypoplastic analysis of cone penetration in sands	607
	Equations of pressuremeter curve with an elastic strain-softening plastic model	613
	Permeability effect on pressuremeter test results	619
	Importance of modelling degree of saturation: The pressuremeter test	627
5.5	Other applications
	Analysis of soil-structure interaction of towers under cyclic loading	637
	Seismic analysis of brick masonry walls of a power substation building	643
	Application of the CANAsand constitutive model to the solution of arching in cohesionless granular media	649
	Injection of a micro-fine cement into a porous medium: Modelling and experimentation	655
	Nonlinear FE-modeling of road base material	661
	Modeling earthquake response in deep soil deposits	667
6.	Miscellaneous Topics
	Influence of fuzzy variability on the estimation of hydraulic conductivity of transversely isotropic geomaterials	675
	Settlement risk assessment: Integrating FEM and GIS	681
	Dependency law for thermal evolution of preconsolidation pressure	687
	Infiltration with density-dependent water retention and conductivity: Saturated vs. unsaturated conditions	693
	Modelling of interaction between a snow mantel and a flexible structure using a discrete element method	699
	Drying and cracking of soils: Numerical modeling	705
	Author index	713