Challenges and Innovations in Geomechanics

Name: Challenges and Innovations in Geomechanics | Proceedings of the 16th International Conference of IACMAG - Volume 1
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Proceedings of the 16th International Conference of IACMAG - Volume 1

Marco Barla Alice Di Donna Donatella Sterpi(Editor)

Springer (Publisher)

1st Edition

Published on 14. January 2021

XX, 1023 pages

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Content

Intro
Preface
Organisation
IACMAG Board Officers
Local Organising Committee
Executive Board
Members
International Scientific Committee
Contents
Keynote Lectures
Coupling Continuum Damage Mechanics and Discrete Fracture Models: A Geomechanics Perspective
Abstract
1 Introduction
2 Meso-macro Governing Hydro-Mechanical Equations
3 Weak Formulation
4 Transition Between Continuum and Discrete
4.1 Finite Element Method (FEM) and Cohesive Zone (CZ) Elements
4.2 EXtended Finite Element Method (XFEM) and CZ Segments
5 Calibration
5.1 Finite Element Method (FEM) and Cohesive Zone (CZ) Elements
5.2 EXtended Finite Element Method (XFEM) and CZ Segments
6 Conclusions
Acknowledgements
References
Liquefaction as Microstructural Instability and Validations: The Disturbed State Concept
Abstract
1 Introduction
1.1 Mechanisms in Instabilities
2 Other Approaches for Liquefaction
2.1 Conventional Approaches
2.2 Energy Approaches
3 Disturbed State Concept (DSC)
3.1 Hierarchical Single Surface (HISS) Plasticity
3.2 Disturbance
3.3 Mathematical Expression for D
3.4 DSC Equations
3.5 Interfaces and Joints
3.6 Liquefaction Using Disturbed State Concept
4 Validations and Applications
4.1 Liquefaction in the Field During Kobe Earthquake
4.2 Liquefaction in Shake Table Test
4.3 Liquefaction in Rough Interfaces
4.4 Liquefaction in Saturated Korean Sand
4.5 Liquefaction: Piles Under Dynamic Lateral Loading
5 Conclusions
References
Nonlinear Seismic Response of Ground-Structure Systems: Developments and Challenges
Abstract
1 Introduction
2 Soil Constitutive Models
2.1 PressureIndependMultiYieldSoftening Material
2.2 PressureDependMultiYield03 Material
2.3 LadeDuncanMultiYield Material
3 Large-Scale Numerical Modeling of 3D Soil-Structure Interaction
3.1 Bridge-Ground Seismic Response Due to Liquefaction
3.2 Spreading-Induced Damage to Short-Span Bridge
3.3 Pile-Supported Wharf Seismic Response
4 OpenSeesPL and Pile/Pile Group Analyses
5 Performance-Based Earthquake Engineering (PBEE) for Bridge Systems and MSBridge
6 Meshfree Framework for Seismic Response of Earth Systems
7 Conclusions
Acknowledgements
References
Development of Cellular Automata Software for Engineering Rockmass Fracturing Processes
Abstract
1 Introduction
2 Brief Introduction to CASRock
2.1 Cellular Automaton Updating Rules
2.2 Mechanical Models
2.3 Engineering Stability Evaluation
3 Software Package
3.1 Application Areas
3.2 Software Functions
4 Typical Applications
4.1 Failure Process of Heterogeneous Rock Under Complex Stress Conditions
4.2 Tunnel Excavation-Induced Failure Mechanism of China Jingping Laboratory Phase II
4.3 Rockburst Characteristics of a Tunnel Based on the LERR
4.4 Modelling Excavation-Induced Dynamic Responses in Rockmass
4.5 Modelling Coupled THM Processes in Bentonite
4.6 Modelling the Rock Cracking Process from Continuity to Discontinuity
4.7 Large-Scale Parallel Simulation of Engineering Rockmass Stability
5 Conclusions
Acknowledgements
References
Energy Geoscience and Engineering
Abstract
1 Introduction
2 Energy Geoscience and Engineering - Scope
3 Geoscience and Engineering to Address Energy Challenges
3.1 Stretching Scales
3.2 Geo-Materials
3.3 Processes and Generalized Constitutive Models
3.4 Dimensionless Ratios
4 Computational Methods in Energy Geo-Engineering
5 Closing Thoughts
Acknowledgements
Appendix A: Energy Resources - Summary Tables
Appendix B: Storage
Appendix C: Conservation and Efficiency
References
Solving Dynamic Soil Deformation-Fluid Flow Coupling Problems Using Material Point Method
Abstract
1 Introduction
2 Theory and MPM Formulation
2.1 Governing Equations
2.2 Fractional Step Algorithm
2.3 Material Point Calculation
3 Examples
3.1 One Dimensional Consolidation
3.2 Wave Propagation in Two-Dimensional Soil Model
4 Conclusions
References
New Advances in Strain Localization Analysis: Application to Seismic Faulting and Compaction Banding
Abstract
1 Introduction
2 Strain Localization Analysis
2.1 The Classical Shear Band Model
2.2 Post-localization Analysis and Ill-Posedness
3 Strain Localization During Seismic Slip
3.1 Weakening Mechanisms in Faults During Seismic Slip
3.2 Strain Localization in a Rock Layer Under Undrained Adiabatic Shearing with Cosserat Microstructure
3.3 Modelling Grain Cataclasis During Strain Localization
4 Effect of Porosity Heterogeneity on Compaction Banding
5 Conclusions
Acknowledgements
References
Special Lectures
A Continuum Viscous-Elastic-Brittle, Finite Element DG Model for the Fracture and Drift of Sea Ice
Abstract
1 Introduction
2 A Visco-elasto-Brittle Framework for the Small and Large Deformations of Sea Ice
2.1 The MEB Rheology
2.2 Implementation in the Context of Sea Ice Modeling
3 Treating Large Deformations
3.1 Tests on Advection and Diffusion: Rigid Body Rotation
3.2 Tests on Advection and Diffusion: Channel Simulations
4 Conclusions
Acknowledgements
References
Modelling Failure in Layered Geological Formations - FDEM: A Micro-mechanical Approach that Bridges Across Scales
Abstract
1 Introduction
2 Finite-Discrete Element Method (FDEM) Concept
3 Bridging Scales
3.1 Microscopic Scale
3.2 Macroscopic Scale
4 Numerical Model
4.1 Laboratory-Scale Simulations
4.2 Field Scale Simulations
5 Results and Discussions
5.1 Laboratory-Scale Simulations
5.2 Field Scale Simulations
5.3 Hydro-Mechanical Simulations
6 Conclusions
Acknowledgements
References
11th Mercer Lecture on Geosynthetics for Construction on Soft Foundation Soils: An Extended Abstract
Abstract
1 Introduction
2 Embankments on Soils Where Reinforcement is Most Critical During Construction
3 Rate Sensitive Soils and Reinforcement
4 Column/Pile-Supported Embankments
Acknowledgements
References
Numerical Simulation of CPT with the Clay and Sand Model (CASM) Including Effects of Bonding
Abstract
1 Introduction
2 Numerical Model
2.1 G-PFEM
2.2 Clay and Sand Model
2.3 Clay and Sand Model with Bonding
2.4 Geometry for CPT Simulation
3 Influence of Shape of Yield Surface (CASM)
4 Influence of Bonding and Destructuration
5 Conclusion
References
Multiphasic Approaches for Estimating THM Properties of Heterogeneous Rocks
Abstract
1 Introduction
2 Thermo-Hydro-Mechanical Modelling
3 The Permeability of the Cobourg Limestone
4 The Biot Coefficient
5 The Thermal Conductivity
6 Conclusions
Acknowledgements
References
Clay Micromechanics: An Analysis of Elementary Mechanisms of Clay Particle Interactions to Gain Insight into Compression Behaviour of Clay
Abstract
1 Introduction
2 Surface Charges on Kaolinite
2.1 Traditional Model (Pedrotti's Model)
2.2 Utah Model
3 Interaction of Double-Layer Generated by Two (Infinite) Plane Parallel Sheets of Constant Charge
3.1 Single Flat Double Layer
3.1.1 Solution of Governing Equation
3.1.2 Effect of Pore-Chemistry and Temperature
3.2 Interacting Flat Double Layers (at Constant Charge)
3.2.1 Solution of Governing Equation
3.2.2 Interaction Pressure
4 Interaction of Square Particles in Absence of Electrolytes
4.1 Face-to-Face Interaction
4.2 Edge-to-Face Interaction
5 Discussion
5.1 Face-to-Face Interaction
5.2 Edge-to-Face Interaction
6 Conclusions
Acknowledgements
References
Methods and Tools - Laboratory Testing, Field Testing and Monitoring
Use of Sand-Rubber Mixture (SRM)-Filled Trenches for Pile Driving Induced Vibration Screening
Abstract
1 Introduction
2 Field Study
2.1 Site Description and Piling Details
2.2 In-Filled Trench with Sand Rubber Mixtures
2.3 Vibration Monitoring
2.4 Results and Discussion
3 Conclusions
Acknowledgments
References
Effectiveness of Using Polymer-Modified Asphalt Binders in Enhancing Fatigue Life of Asphalt Mixes Containing RAS and RAP
Abstract
1 Introduction
2 Objectives
3 Materials and Methods
4 Results and Discussion
5 Conclusions
Acknowledgements
References
Multi-scale Study of Grain Crushing in Granular Soils
Abstract
1 Introduction
2 Material
3 Experimental Evidences
4 Compressibility Model
5 Model Prediction Against Experimental Data
6 Conclusion
References
Can LS-DEM be Used to Simulate Cyclic Behavior of Sand?
Abstract
1 Introduction
2 LS-DEM
3 Digital Twin of a Specimen of Hostun Sand
3.1 Hostun Sand
3.2 Digital Twin
3.3 Analyses
4 Results and Interpretations
4.1 Oedometer Test
4.2 Drained Cyclic Triaxial Test
4.3 Undrained Cyclic Triaxial Test
5 Conclusions
References
Cyclic Shear Behaviour of High Plasticity Cohesive Soil Subjected to Variation of Frequency and Amplitude
Abstract
1 Introduction
2 Material Properties, Specimen Preparation
3 Experimental Program
4 Results and Discussion
4.1 Hysteresis Behaviour
4.2 Equivalent Pore Pressure Response
4.3 Dynamic Properties
4.4 Stiffness Degradation
4.5 Cumulative Energy Dissipation
5 Conclusions
References
Water Migration Influence on Changes of Physical and Mechanical Characteristics a Clay Soil Under Triaxial Loading
Abstract
1 Introduction
2 Research and Results
2.1 Experimental Research
2.2 Theoretical Research
3 Conclusions
References
Experimental and Numerical Investigation of One-Dimensional Infiltration into Unsaturated Soil
Abstract
1 Introduction
2 Column Design and Characteristics
3 Material Characteristics and Placement
4 Testing and Results
4.1 Soil Water Characteristic Curve
4.2 Soil Permeability Function
5 Discussion on Experimental Testing
6 Numerical Infiltration Study
7 Conclusions
Acknowledgments
References
Back-Calculation of Stresses and Pore Pressures Around a Penetrating Cone in Silt
Abstract
1 Introduction
2 Experimental Work
3 Numerical Analyses
4 Results and Discussion
5 Conclusions
Acknowledgements
References
Application of Intelligent Compaction (IC) as a Quality Control Tool: An Oklahoma Experience
Abstract
1 Introduction
2 Site Descriptions, Approach of the Analysis
2.1 Site Description
2.2 Data Filtering and Cleaning
2.3 Inconsistent Project Boundary
2.4 File Naming Inconsistency
3 Results and Discussion
3.1 Coverage, Temperature, Roller Speed and Frequency
3.2 Compliance and Missing Data
4 Conclusions
Acknowledgements
References
Investigation of Uncertainty in Strength Parameter Identification
Abstract
1 Introduction
2 Triaxial Compression Tests
3 Numerical Simulations
4 Conclusions
Acknowledgements
References
Measurement and Study of Steel Pipe Jacking Force in Silty Sand Stratum
Abstract
1 Introduction
2 Project Background
2.1 Pipe Jacking Project
2.2 Site Condition
2.3 Design and Construction Schemes
2.4 The Installation of Stress Sensors
3 Monitoring Results
3.1 Stress Analysis of Test Pipe
3.2 The Monitoring of Jacking Force
4 Numerical Analysis for the Test Steel Pipes
4.1 Finite Element Meshes for the Test Steel Pipe
4.2 Calculation of Jacking Forces
4.3 Stress Distributions on the Pipes
5 Back Analysis of Face Resistance and Friction Resistance
5.1 The Model for Calculating the Face Resistance and the Friction Resistance
5.2 The Per Unit Length Frictional Resistance UFs
5.3 The Face Resistance F0
6 Conclusions
Acknowledgements
References
Numerical Investigation on the Effect of Grain Crushing Process on Critical State on Rockfill Material
Abstract
1 Introduction
2 Method
3 Results
4 Conclusion
Acknowledgements
References
Experimental and DEM Study of Two Dimensional Simple Shear
Abstract
1 Introduction
2 Methodology
3 Simple Shear Results and Analyses
4 Conclusions
Acknowledgements
References
Effects of Contamination and Dry Density on Dielectric Properties of Soils with Different Specific Surface Area
Abstract
1 Introduction
1.1 Soil Dielectric Permittivity
1.2 Effects of Soil Parameters on Dielectric Permittivity
1.3 Mixture Model
2 Materials and Method
3 Results and Discussion
3.1 Effects of Pore Fluid on Soil Dielectric Constant
3.2 Dependence of the Geometrical Parameter on Pore Fluid and Dry Density
4 Conclusion
References
Methods and Tools - Probabilistic Site Characterization and Data Analytics
Online Geological Anomaly Detection Using Machine Learning in Mechanized Tunneling
Abstract
1 Introduction
2 Methodology
3 Application Example: Wehrhahn-Linie Metro Project
3.1 Data Processing
3.2 Experiments
4 Conclusions
Acknowledgements
References
Assessing Transformation Models Using a Geo-Database of Site Investigation Data for the Kathmandu Valley, Nepal
Abstract
1 Introduction
2 Soil Variability in the Kathmandu Valley, Nepal
3 Methodology
4 Statistical Analysis
4.1 N versus Vs Pairing Approaches
4.2 Correlations with Geotechnical Parameters
5 Summary and Conclusions
Acknowledgements
References
Quantification of Non-stationary Non-Gaussian Geotechnical Spatial Variability in a Specific Site from Sparse Measurements
Abstract
1 Introduction
2 Bayesian Compressive Sampling-Karhunen-Loève Random Field Generator
3 Simulated Example
3.1 RFS Generation of Non-stationary and Non-Gaussian Spatial Variability from Sparse Measurements
3.2 Effect of Measurement Interval
3.3 Effect of Number of Soundings
4 Conclusions
Acknowledgements
References
Estimating Spatial Correlation Statistics from CPT Field Data, Using Convolutional Neural Networks and Random Fields
Abstract
1 Introduction
2 Description of Approaches
2.1 Autocorrelation Fitting Method
2.2 Convolutional Neural Network Method
3 CNN Training Data and Procedure
4 Results and Comparison
5 Practical Implementation
6 Conclusions
References
Methods and Tools - Constitutive Modelling
On Inception of Instabilities in Granular Media Across Length-Scales with Flexible Boundaries
Abstract
1 Introduction
2 Instability Onset Within a "Continuum" Framework
3 Peeking into the "Discontinuum" World: A Granular Perspective of Instabilities
4 Macro to Micro: Biaxial "Element" Tests in FB-PS Device
5 Conclusions
References
Application of Barodesy - Extended by the Intergranular Strain Concept
Abstract
1 Introduction
2 Barodesy
3 Extension to Small-Strain Behaviour
4 Numerical Implementation
4.1 Basic Intergranular Strain Concept
4.2 Reduction of Overshooting Effects
4.3 Strength Reduction Procedure
5 Simulations
6 Conclusions
Acknowledgements
References
Finite Element Simulations of Clayey Soil Ground with a Three-Dimensional Nonlinear Elastic Viscoplastic Model
Abstract
1 Introduction
2 Equations and Numerical Implementation of the EVP Model
2.1 The 3-D Elastic Viscoplastic Model Based on Creep Equations
2.2 Algorithm scheme of implementation in Plaxis for the EVP model.
3 Simulations on Berthierville Embankment Using the EVP Model
3.1 Simulated Settlements and Excess Pore Pressure of the Berthierville Clay
3.2 The Parametric Study on the Creep Strain Limit
4 Conclusions
Acknowledgements
References
Modelling the Stress-Strain Behaviour of a Soft Soil Improved with an Environmentally Friendly Binder
Abstract
1 Introduction
2 Laboratory Test Results
3 Model Calibration
4 Simulation Results
5 Conclusion
Acknowledgments
References
A Viscoelastic, Viscoplastic, and Viscodamage Constitutive Model of Salt Rock
Abstract
1 Introduction
2 Theoretical Equations of Constitutive Model
2.1 Viscoelasticity Constitutive Equations
2.2 Viscoplasticity Constitutive Equations
2.3 Viscodamage Constitutive Equations
2.4 Coupling of Viscodamage, Viscoelastic, and Viscoplastic Models
3 Calibration Method of Constitutive Model
4 Verification and Discussion of Constitutive Model
5 Long-Term Time-Dependent Deformation and Failure Analysis of Underground Energy Storage Cavern
6 Conclusions
Acknowledgements
References
A Generalized Constitutive Relationship for Undrained Soil Structure Interaction Problems
Abstract
1 Introduction
2 Numerical Analyses
3 Upscaled Constitutive Relationship
4 Conclusions
References
Numerical Modelling of Soil-Pile Interface Response
Abstract
1 Introduction
2 Soil-Structure Interface Modelling
2.1 Interface Model Description
2.1.1 Elastic Part
2.1.2 Plastic Part
2.2 Simulation of Direct Shear Tests
2.2.1 Description of the Model in FLAC3D
2.2.2 Case Study
3 Conclusion
Acknowledgements
References
Hypoplastic Model for Clays with Stiffness Anisotropy
Abstract
1 Introduction
2 Brief Description of the ISA Model
3 Description of Test Material and Experiments
4 Model Calibration and Numerical Implementation
5 Simulation of Element Tests
6 Conclusions
Acknowledgements
References
On the Numerical Implementation of a Thermomechanical Hyperplasticity Model for Fine-Grained Soils
Abstract
1 Introduction
2 Constitutive Equations
3 Implicit Implementation of Constitutive Equations
3.1 Stress Integration
3.2 Tangent Operator Stiffness Matrix
4 Numerical Simulations
5 Conclusions
Acknowledgements
References
A Visco-Elastic DEM Model of Rock Under Different Loading Rates
Abstract
1 Introduction
2 Dynamic Constitutive Model Based on Discrete Element Method
2.1 Visco-Elastic Constitutive Model Based on Discrete Element Method
2.2 Visco-Elastic Force Displacement Law of Flat-Joint Model
2.3 Dynamic Fracture Criterion
3 Development of Visco-Elastic Flat-Joint Model
4 Impact of Visco-Elastic Parameters
5 Conclusion
References
Prediction of Strength-Band of Methane Hydrate-Bearing Sand by Elastoplastic Constitutive Model Considering Microstructure of Gas Hydrates
Abstract
1 Introduction
2 Elastoplastic Constitutive Model
2.1 Definition of Total Hydrate Saturation and Morphology Ratio
2.2 Yield Function
2.3 Hardening Parameters
3 Conditions of Model Analysis
4 Simulation Results
5 Conclusions
References
Measuring and Modelling Cyclic Response of Dense Sand Under Partially Drained Conditions
Abstract
1 Introduction
2 The Partially Drained Cyclic Triaxial Tests
2.1 Sand and Setup
2.2 Test Results
3 Back-Calculations of the Tests
4 Conclusions
Acknowledgements
References
The Strength Reduction Method in Clay Hypoplasticity
Abstract
1 Hypoplastic Clay Model
2 Strength Reduction in Clay Hypoplasticity
2.1 Reduction of Deviatoric Stress {{\varvec s}}
2.2 Selection of the Correct Solution
3 A Study on the Strength Reduction
4 Conclusions
Acknowledgements
References
Simulation of Viscoplastic Material Behavior in Numerical Models
Abstract
1 Introduction
2 Viscoplastic Material Behavior of Granular Rock Salt
2.1 Basics
2.2 Time Variant Deformation and Velocity Variant Fracture Behavior
3 Numerical Simulation of Viscoplastic Material Behavior
3.1 Constitutive Law
3.2 Implementation and Verification
4 Conclusions
References
Constitutive Modelling of the Deformation and Degradation of Railway Ballast Using Multi-laminate Framework
Abstract
1 Introduction
1.1 Stress Notations
2 Mathematical Description of Multi-laminate Framework
3 Influence of Particle Breakage
4 Constitutive Equations
5 Model Predictions
5.1 Validation Under Triaxial Compression Stress Paths \left( {{\varvec \alpha}= 0} \right)
5.2 Influence of Principal Stress Rotation ( {\varvec \alpha}\gt 0)
6 Conclusions
Acknowledgements
References
Constitutive Behaviour of Brittle Layered Rocks Using a 3D Anisotropic Hoek and Brown Model
Abstract
1 Introduction
2 Constitutive Equations
2.1 Model Parameters
3 Model Performance
4 Shear Bands Modeling in Plane Strain Compression Tests
5 Conclusions
References
A New Constitutive Approach for Simulating Solid- to Fluid-like Phase Transition in Dry and Saturated Granular Media
Abstract
1 Introduction
2 The Constitutive Approach
3 Model Predictions, DEM Results and µ-e-I Rheology Comparison
3.1 Dry Conditions
3.2 Saturated Conditions
4 Conclusions
Acknowledgements
References
Plane Strain Failure for Different Constitutive Models
Abstract
1 Introduction
2 Constitutive Models
3 Investigations in the Deviatoric Plane
4 Strength Reduction Analysis
5 Conclusions
Acknowledgements
References
An Image Point Identification Rule for 3D Bounding Surface Plasticity Models
Abstract
1 Introduction
2 Plasticity Model
2.1 Bounding, Loading and Plastic Potential Surfaces
2.2 Hardening Modulus and Mapping Rule
3 A Numerical Framework for Identification of the Current Stress Point
4 Numerical Results
5 Conclusions
References
An Anisotropic Clay Plasticity Model for the Cyclic Resistance
Abstract
1 Introduction
2 The Reference SANICLAY Model
3 Performance of Different Degradation Mechanisms
4 A Degradation Theory for the Cyclic Resistance
5 Model Validation
5 Model Validation
6 Conclusions
Acknowledgements
References
Effect of Claystone Small-Scale Characteristics on the Variability of Micromechanical Response and on Microcracking Modelling
Abstract
1 Introduction
2 Clay Rock Microstructure
3 Microscale Model
4 Modelling of Clay Rock Behaviour
5 Conclusions
References
A Thermodynamics-Based Formulation for Coupled Hydro-Mechanical Behaviour of Unsaturated Soils
Abstract
1 Introduction
2 A Generic Thermodynamics-Based Formulation
3 A Critical State Model for Unsaturated Soils Based on Thermodynamics
4 Validation with Experiments
4.1 Drained Tests
4.2 Undrained Tests
5 Conclusions
Acknowledgements
References
Numerical Manifold Method for Simulating of Multi-crack Propagation in Rock Mass
Abstract
1 Introduction
2 Expansion of Numerical Manifold Method
2.1 Expansion of Finite Cover System
2.2 Expansion of Element Matrix
2.3 Simplex Integration
2.4 Calculation of Stress Intensity Factor by J-Integral
3 Multi-crack Propagation Method
3.1 Hypothesis-Modified Multi-crack Propagation Algorithm
3.2 Crack intersection
4 Example Verification of Expanded NMM
5 Multi-crack Propagation Simulation
6 Conclusions
Acknowledgements
References
Three-Dimensional Constitutive Model for Dry Granular Materials Under Different Flow Regimes
Abstract
1 Introduction
2 DEM Model
3 Constitutive Model
4 Comparison Between Constitutive Model and DEM Results
4.1 Influence of Lode Angle
4.2 Influence of Strain Rate
5 Conclusions
Acknowledgements
References
Elasto-Plastic Coupling in Soils: A Thermodynamic-Based Approach
Abstract
1 Introduction
2 Elasto-Plastic Coupling Within the Framework of Hyperplasticity
3 One-Dimensional Example
4 Isotropic Elasto-Plastic Coupling
5 Anisotropic Elasto-Plastic Coupling
6 Conclusions
References
Calibration of an Advanced Constitutive Model Through Direct Shear Test Results
Abstract
1 Introduction
2 Direct Shear Tests: Constant Normal Load and Constant Normal Stiffness
2.1 Shear Band Thickness
3 Calibration of the Constitutive Model
4 Boundary Value Problem: Shaft Bearing Capacity of Bored Piles
5 Conclusions
References
Improved Contact Bond Model of Discrete Element Method for Simulating Strain Rate Effect of Rock Materials
Abstract
1 Introduction
2 The Contact Bond Model Considering Crack Propagation
2.1 Theory
2.2 The Test of Improved Contact Bond Model
3 The SHPB Simulation with Improved Contact Bond Model
3.1 The Model of Simulation Experiment
3.2 The Result of Numerical Simulation
4 Conclusions
References
Compression Model of Crushable Granular Materials Considering Particle Size Effect
Abstract
1 Introduction
2 Comparison of Existing Compression Models
3 Proposed Model
3.1 Model Description
3.2 Evaluation of Input Parameters
4 Model Verification
5 Conclusions
Acknowledgments
References
Methods and Tools - Coupled and Multiphase Modelling
Numerical Methods for Simulation of Coupled Hydro-Mechanical Processes in Fractured Porous Media
Abstract
1 Introduction
2 Continua with Fractures - Deformation and Flow
3 Numerical Solution of the Generalized Biot System
4 Solution of a Model Problem
5 Conclusions
Acknowledgements
References
Hydro-Mechanical Modelling of Multiphase Flow in Coalbed by Computational Homogenization
Abstract
1 Introduction
2 Hydro-Mechanical Model
2.1 Decomposition of the Microkinematics
2.2 Periodic Boundary Conditions
2.3 Separation of Scales
2.4 Microscale Balance Equations
2.5 Microscale Constitutive Laws
2.5.1 Matrix
2.5.2 Cleats
2.6 Microscale Numerical Solution
2.6.1 Mechanical Part
2.6.2 Hydraulic Part
2.7 Homogenized Macroscale Response
3 Reservoir Modelling
4 Conclusions
Acknowledgements
References
A Critical Review of the Effect of Temperature on Clay Inter-particle Forces and Its Effect on Macroscopic Thermal Behaviour of Clay
Abstract
1 Introduction
2 Temperature Effects on Clay Minerals
3 Temperature Effects on Clay Water
4 Effect of Temperature on Inter-particle Forces
4.1 Face to Face Interaction
4.2 Edge to Face Interaction
5 Conclusions
Acknowledgements
References
Mathematical Modeling of Water Infiltration in Unsaturated Latosol Samples
Abstract
1 Unsaturated Transient Vertical Flow
2 Materials and Methods
3 Results and Discussion
3.1 Case 1: Variation of Volumetric Moisture Content with Time at Constant Z
3.2 Analysis of Confidence Intervals- Case 1 Adjustment
3.3 Case 2: Variation of Volumetric Moisture Content with Time at Variable Z
3.4 Analysis of Confidence Intervals -Case 2 Adjustment
4 Conclusions
Acknowledgements
References
3-D Particle Simulation Model for Weathering Processes of Geomaterials Under a Wet-Dry Cyclic Condition
Abstract
1 Introduction
2 Outline of Simulation Model
2.1 Model of Swelling and Shrinking
2.2 Model of Cohesion
3 Simulation of Mudstone Subjected to Wetting and Drying
3.1 One Specimen
3.2 Multi Specimens
4 Conclusions
Acknowledgements
References
Consolidation of Saturated Soils through a Different Prism
Abstract
1 Introduction
2 Revised 3-D Formulation of Soil Consolidation
3 Derivation of 1-D Revised Consolidation Equations
4 Solution of the Revised 1-D Consolidation Equations
5 Concluding Remarks
Acknowledgements
References
Molecular Origin of Compressibility and Shear Strength of Swelling Clays
Abstract
1 Introduction
2 Molecular Model Construction
3 Compressibility of Clay Interlayer with Various Fluid Polarities
4 Shear Response of Clay Interlayer with Various Fluid Polarities
5 Conclusions
Acknowledgements
An Elasto-Plastic Framework for the Chemo-Mechanical Behavior of Low to Medium Activity Clays
Abstract
1 Introduction
2 Chemo-Mechanical Model
3 The Role of Yield Surface Evolution with Osmotic Suction
4 Comparison with Experimental Data
5 Conclusions
References
A Robust Implementation of Dynamic Evolution of Fluid-Driven Fractures
Abstract
1 Introduction
2 Problem Statement
3 Numerical Simulations
3.1 Hydraulic Fracturing in a Cemented Naturally Fractured Domain
4 Conclusions
References
Creep Effects on the Thermo-Hydro-Mechanical Responses of Callovo-Oxfordian Claystone
Abstract
1 Introduction
2 Constitutive Models
2.1 Coupled Mohr-Coulomb-Power/Norton Models
2.2 Advanced Approach
3 Modeling of HLW Repository
4 Conclusions
References
Investigation of Parameter Influence on Damage Evolution via PD-FEM Coupling Method
Abstract
1 Introduction
2 PD-FEM Coupling Method
3 Numerical Investigation
3.1 Crack Propagation Analysis
3.2 Parameter Influence Investigation
4 Conclusions
Acknowledgements
References
Integrated Modeling of Fully Coupled Two-Phase Surface and Subsurface Flow
Abstract
1 Introduction
2 Integrated Model of Fully Coupled Two-Phase Surface and Subsurface Flow
3 Validation of the Integrated Model of Fully Coupled Two-Phase Surface and Subsurface Flow
4 Wide Area Runoff and Infiltration Analysis
5 Conclusions
Acknowledgements
References
Methods and Tools - Advanced Constitutive Modeling of Soils in Practical Applications
Evolving Elastic and Plastic Fabric Anisotropy in Granular Materials: Theoretical and Applied Implications
Abstract
1 Introduction
2 Constitutive Assumptions
3 Calibration and Model Performance
4 Conclusions
References
Discrete Numerical Modelling of a Cohesive Soil Layer Reinforced by Geosynthetic Sheet Using an Advanced Constitutive Law
Abstract
1 Introduction
2 Numerical Simulation of the Physical Model
3 The Constitutive Model of Mohr Coulomb
4 Investigation of a New Constitutive Model
5 Conclusions
Acknowledgements
References
Evolution of Undrained Strength Under a Test Embankment
Abstract
1 Introduction
2 Research Methodology
3 Haarajoki Test Embankment
4 Numerical Model
5 Results
6 Conclusions and Discussion
Acknowledgements
References
Effects of Pore Pressure on Wandering in Structural Natural Frequency
Abstract
1 Introduction
2 Methodology
2.1 Numerical Model
2.2 Soil Constitutive Model
2.3 Dynamic System Identification
2.4 Case Study: The Hotel VN7SH in Pasadena, California
3 Validation of the Soil Constitutive Model
4 Results
5 Discussion and Conclusions
References
On Validation of a Two-Surface Plasticity Model for Soil Liquefaction Analysis
Abstract
1 Introduction
2 Calibration of the Constitutive Model
3 Simulation of Lateral Spreading
4 Stochastic Simulations
5 Conclusions
Acknowledgements
References
Importance of Sand Fabric Anisotropy on Fault Rupture-Foundation Interaction
Abstract
1 Introduction
2 Numerical Methodology
3 Normal Fault Rupturing Under Free-Field Conditions
4 Normal Fault - Foundation Interaction
5 Conclusions
Acknowledgements
References
Importance of Sand Fabric Anisotropy on the Bearing Capacity of Footings
Abstract
1 Introduction
2 Numerical Methodology
3 Simulation of Load-Settlement Response of Strip Footings
4 Importance of Neglecting Evolving Fabric Effects
5 Conclusions
Acknowledgements
References
Parallelized Numerical Optimization for Parameter Fitting of an Advanced Elasto-Viscoplastic Model with an Open Source Implementation
Abstract
1 Introduction
2 A Benchmark of Optimization Schemes for a Consolidation Problem
2.1 Optimization Algorithms Considered
2.2 Benchmark Set-up: Fitting to a Model Solution
2.3 Benchmark Results
3 Parallelized Optimizations
4 Conclusion
References
Evaluation of Seismic Response of Rectangular Underground Structures in Liquefiable Soils
Abstract
1 Introduction
2 Numerical Modeling
3 Typical Calculation Results
4 Analysis of Soil-Structure Interaction
5 Conclusions
Acknowledgements
References
Methods and Tools - Material Point Method in Computational Geomechanics
Analysis of Cone Penetration Using the Material Point Method
Abstract
1 Introduction
2 MPM Implementation
3 Simulation
4 Conclusions
References
Overcoming Volumetric Locking in Three-Dimensional Material Point Analysis
Abstract
1 Introduction
2 Material Point Continuum Formulation
3 Numerical Implementation
4 Numerical Examples
5 Conclusions
Acknowledgements
References
Large Deformation Analysis of Embankments Considering Liquefaction Using Material Point Method
Abstract
1 Introduction
2 Material Point Method for Multi-phase Geomaterials
3 Numerical Simulation of Large Deformation of Embankment Considering Liquefaction
3.1 Problem Setting
3.2 Results and Discussions
4 Conclusions
Acknowledgements
References
Multiscale Modeling of Anchor Pull-Out in Sand
Abstract
1 Introduction
2 Model Setup
3 Result and Discussion
3.1 Anchor Resistance
3.2 Failure Pattern
3.3 Local Analysis
4 Conclusions
Acknowledgements
References
A Coupled MPM-SPH Numerical Simulation for Fully Saturated Soil
Abstract
1 Introduction
2 MPM-SPH Formulation
2.1 Governing Equations
2.2 Numerical Implementation
2.3 Boundary Conditions
3 Numerical Demonstrations
3.1 Terzaghi's Consolidation Problem
3.2 Mandel-Cryer Consolidation Problem
4 Conclusion
References
Insights into Suction Caisson Installation Utilising the Material Point Method
Abstract
1 Introduction
2 Axisymmetric MPM
3 Numerical Model
4 Results and Discussion
5 Concluding Remarks
Acknowledgements
References
Numerical Modelling and Simulation of the Wheel Rotation Problems by the Material Point Method
Abstract
1 Introduction
2 Wheel Rotation Model
3 MPM Algorithm of Wheel-Soil Contact Detection
4 MPM Simulation Results
5 Conclusions
Acknowledgements
References
Development of a Robust Coupled Material Point Method
Abstract
1 Introduction
2 Governing Equations for Fully Saturated Porous Soils
3 Alleviating Volumetric Locking in the Coupled MPM
4 Numerical Implementation of GC-SRI-patch
5 Numerical Examples
5.1 1D Consolidation Under Small Deformation Analysis
5.2 1D Consolidation Under Large deformation Analysis
6 Conclusions
Acknowledgements
References
Methods and Tools - Quantification and Reduction of Uncertainty in Geomechanical Numerical Models
Geogenic Arsenic Release by Iron-Oxides Reductive Dissolution in Aquifer Systems
Abstract
1 Introduction
2 Fe-Oxides Reductive Dissolution Modeling
3 Model Implementation and Global Sensitivity Analysis
4 Results and Discussion
5 Conclusions
Acknowledgements
References
Bayesian Uncertainty Quantification for Geomechanical Models at Micro and Macro Scales
Abstract
1 Introduction
2 Iterative Bayesian Filtering
3 Uncertainty Quantification for the DEM Model
4 Uncertain Quantification for the NorSand Model
5 Uncertainty Propagation Between Micro and Macro Parameters
6 Conclusions
References
Efficient Implementation of the Bayesian Inversion by MCMC with Acceleration of Posterior Sampling Using Surrogate Models
Abstract
1 Introduction
2 Metropolis-Hastings Based Sampling Algorithms
3 Surrogate Model Constructed Using MCMC Samples
4 Surrogate Model Updates During the Sampling Process
5 Application to Geo-Engineering Model Problems
6 Conclusions
Acknowledgements
References
A Discrete Fracture Network Approach to Rock Mass Classification
Abstract
1 Introduction
2 Rock Mass Classification Systems
3 Rock Mass Classification Using DFN
4 Scale Effects and Variability of Rock Mass Behaviour
5 Conclusions
Acknowledgements
References
Integration of Data Assimilation Techniques in Geomechanical Modelling: Ensemble Smoother with Multiple Data Assimilation Analysis
Abstract
1 Introduction
2 Ensemble Smoother with Multiple Data Assimilation
3 Application of MDA-ES to a Synthetic Test Case
3.1 Synthetic Test Case
3.2 Constant Inflation Coefficients
3.3 Variable Inflation Coefficients
3.4 Fixed Inflation Coefficients
4 Conclusions
References
Validation of Numerical Analysis for Deformation of Clay Ground Based on Uncertainty Quantification
Abstract
1 Introduction
2 Centrifugal Experiment
2.1 Model Preparation
2.2 Centrifugal Conditions
2.3 Experimental Results
3 Triaxial Tests
3.1 Test Conditions
3.2 Test Results
4 Numerical Simulations
4.1 Numerical Conditions
4.2 Material Parameters
4.3 Numerical Results and Validation
5 Conclusions
Acknowledgements
References
Prediction of Frictional Jacking Forces Using Bayesian Inference
Abstract
1 Introduction
2 Bayesian Inference
2.1 Bayes' Rule
3 Markov Chain Monte Carlo (MCMC) Simulation
3.1 Metropolis-Hastings (MH) Algorithm
4 Proposed Bayesian Framework
4.1 Empirical Jacking Force Model
4.2 Probabilistic Model for Bayesian Inference
5 Implementation Procedure
6 Application to Case Study
7 Conclusions
References
Application of an HMC Based Approximate Method for Combined Identification of Hydraulic Conductivity and Piping Region Interface
Abstract
1 Introduction
2 Governing and Observation Equations
3 Approximate Parameter Update
3.1 Hamiltonian Monte Carlo
3.2 Reversible Mesh Moving Proposal
3.3 Gradient Computation
4 Seepage Flow in a Domain Consisting a Predefined Piping Region
5 Results and Discussions
6 Conclusions
References
Numerical Investigation of the Strength Variability of Rock Using DEM
Abstract
1 Introduction
2 Numerical Model
2.1 Discrete Element Method - YADE Framework
2.2 Microscopic Parameters
3 Specimen Preparation
3.1 Sample Generation
3.2 Strength Variability
4 Numerical Results
4.1 Direct Tensile Tests
4.2 Uniaxial Compressive Strength Tests
4.3 Discussion
5 Conclusion
Acknowledgements
References
Uncertainty and Sensitivity Analysis of Soil Parameters for Tunneling in Urban Area
Abstract
1 Introduction
2 General Concepts on Variance-Based Sensitivity Indices for Independent Inputs
3 Global Review on Fourier Amplitude Sensitivity Test
3.1 The Classical FAST
3.2 The Random Balanced Design FAST
3.3 The Extended FAST
4 Application to an Excavation of Tunnel in a Multilayer Soil in Urban Area
4.1 Problem Description
4.2 Sensitivity Analysis: Deformation Modulus as Variable (E)
4.3 Sensitivity Analysis: Deformation Modulus and Cohesion as Variables
4.4 Sensitivity Analysis: Frictional Angle and Cohesion as Variables
5 Conclusion and Discussion
References
Advances in the Study of Micromechanical Behaviour for Granular Materials Using Micro-CT Scanner and 3D Printing
Abstract
1 Background
2 Influence of Particle Geometry on Shear Strength
3 Limitations in Discrete Element Modelling (DEM)
4 Realistic Particle Geometry Using Micro-CT Scan
5 3D Printed Synthetic Particles
6 Printing Process of Synthetic Particles
7 Future Works and Recommendations
8 Conclusions
Acknowledgements
References
Reducing Uncertainty in Soil Excavations by Assimilating Direct and Indirect Soil Measurements
Abstract
1 Introduction
2 The (Conditional) Random Finite Element Method
3 Soil Excavation
4 Results and Discussion
4.1 Assimilating Direct Information (Conditional Simulation via Kriging)
4.2 Assimilating Indirect Information (Conditional Simulation via EnKF)
4.3 Assimilating Both Direct and Indirect Information (Conditional Simulation via Both Kriging and EnKF)
5 Conclusions
References
SODA: A Serial Fortran Library for Adaptation of Structured Meshes
Abstract
1 Introduction
2 Mesh Data Structure
3 Routines
4 Example Problem
5 Conclusions
References
Numerical Modelling of Dynamic Compaction of Soils
Abstract
1 Introduction
2 Governing Equations and Numerical Solutions
3 Constitutive and Soil-Water Retention Model
4 Validation
5 Mechanical Response to Dynamic Compaction
6 Conclusion and Future Work
Acknowledgements
References
A Surrogate Model for Fast Land Subsidence Prediction and Uncertainty Quantification
Abstract
1 Introduction
2 Forward Model and Parametrization
3 gPC Approximation
4 ES and gPC-ES
5 Results
5.1 Model Set-up
5.2 Uncertainty Propagation
5.3 ES vs gPC-ES
5.4 gPC-ES vs gPC-MCMC Update
6 Conclusions
References
Methods and Tools - Reliability and Risk Analysis
Influence of Heterogeneity on the Elastic Contact Problems in Geotechnical Engineering
Abstract
1 Introduction
2 Method for Elastic Contact Problems
3 Radom Field Generation
4 Illustrative Example
5 Conclusions
Acknowledgements
References
A Numerical Study on Controlling Parameters for Runout Distance of Landslides
Abstract
1 Introduction
2 Numerical Experiment
2.1 Numerical Model and Parameters
2.2 Methodology
2.3 Numerical Results and Analysis
3 Conclusions
Acknowledgements
References
Finite Element Analysis for Deep Mixing Column Considering Statistical Uncertainty
Abstract
1 Introduction
2 Approach
2.1 Probability Distribution of Strength
2.2 Inference of Statistical Uncertainty
2.3 Generation of Random Field
2.4 Finite Element Analysis
3 Application Analysis
3.1 Inference of Statistical Uncertainty
3.2 Finite Element Analysis with Random Theory
3.3 Finite Element Analysis Result
4 Conclusions
Acknowledgements
References
The Geological Model Reliability in Tunnelling and Its Influence on the Geomechanical Model: A Quantification Attempt
Abstract
1 Introduction
2 Interplays Between Geological and Geotechnical Characterization
3 How to Quantify the Geological Model Reliability?
4 Conclusions
References
Bayesian Analysis, Multilinear Regression and Modern Machine Learning Algorithms Applied for Soil Probabilistic Characterization
Abstract
1 Introduction
2 Analysis Workflow
3 Exploratory Data Analysis (EDA)
3.1 Description of Available Data
4 Machine Learning Algorithms
4.1 Frequentist Linear Regression
4.2 Classifiers Models
4.3 Bayesian Regression
5 Preparation of Data
6 Results
6.1 Frequentist Methods and Machine Learning Algorithms Results
6.2 Bayesian Models
7 Conclusions
References
Random Field-Based Numerical Modeling of Deep Excavation in Soft Soils for Adjacent Building Damage Probability Assessment
Abstract
1 Introduction
2 Methods
2.1 Base Information
2.2 Statistical Analysis and Random Field Simulation
2.3 Numerical Modeling
2.4 Damage Probability Assessment
3 Results
4 Conclusions
Acknowledgments
References
Reliability Analysis of Earth Slopes Using Direct Coupling
Abstract
1 Introduction
2 Problem Setting
2.1 Performance Function
2.2 First Order Second Moment (FORM)
3 Methodology
3.1 Steps of the Probabilistic Modeling
3.2 Application of the Problem and Boundary Conditions
4 Analysis and Results
4.1 Initial Results
4.2 Variation of the Slope Angle (i)
4.3 Sensitivity of Variables
4.4 Determination of the Critical Slip Surface
5 Conclusions
Acknowledgements
References
Failure Analysis for Geo-Hydrologic Design
Abstract
1 Introduction
2 Probabilistic Procedure
3 Verification Test
4 Field Application
5 Conclusions
Acknowledgements
References
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