Format:
1 Online-Ressource (230 pages)
ISBN:
9789811046278
Content:
Preface -- Acknowledgements -- Contents -- Nomenclature -- 1 Introduction to Landslides -- 1.1 Background -- 1.2 Terrestrial Landslides -- 1.2.1 Classification and Characteristics -- 1.2.2 Major Research on Terrestrial Landslides -- 1.3 Submerged Landslides -- 1.3.1 Classification and Characteristics -- 1.3.2 Major Research on Submerged Landslides -- 1.4 Model Testing-Granular Column Collapse -- 1.5 Numerical Investigations -- 1.5.1 The Finite Element Method -- 1.5.2 The Smoothed Particle Hydrodynamics -- 1.5.3 The Discrete Element Method -- 1.5.4 The DEM-CFD Coupling Method -- 2 Introduction to Discrete Element Method -- 2.1 The Discrete Element Method -- 2.1.1 Particle Motion -- 2.1.2 The Particle-Particle Contact Model -- 2.1.3 The Calculation of Stress in the DEM -- 2.1.4 Coordination Number -- 2.2 Model Validation -- 2.2.1 Input Parameters of the DEM Model -- 2.2.2 Determination of Numerical Time Step -- 2.2.3 Numerical Simulation of Triaxial Tests -- 2.2.3.1 Model Configuration -- 2.2.3.2 Results -- 2.2.4 Material Angle of Repose -- 2.2.4.1 Results -- 2.3 Conclusions -- 3 Investigation of Dry Granular Flows -- 3.1 The Granular Column Collapse Model -- 3.2 Dimensional Analysis -- 3.3 Numerical Simulations -- 3.3.1 Deformation of the Granular Assembly -- 3.3.2 Influence of Initial Column Aspect Ratio -- 3.3.3 Influence of Model Size Ratio -- 3.3.4 Influence of Column Characteristic Strain -- 3.3.5 Influence of Material Internal Friction Angle -- 3.4 Mechanical Analyses -- 3.4.1 Evolution of Granular Velocity -- 3.4.2 Granular Energy -- 3.4.3 Linear Momentum -- 3.4.4 Flux of Kinetic Energy -- 3.4.5 Distribution of Kinetic Energy and Linear Momentum -- 3.4.6 Evolution of Force Chains -- 3.4.7 Distribution of Stress -- 3.4.8 Distribution of Coordination Number -- 3.4.9 Destination of Surface Grains -- 3.4.10 Influence of Air Viscous Force
Content:
3.5 Conclusions -- 4 Introduction to the DEM-CFD Coupling Model -- 4.1 Fluid-Solid Interaction -- 4.2 Governing Equations of Fluid Flow -- 4.2.1 Fluid Mass Conservation Law -- 4.2.2 Fluid Momentum Conservation Law -- 4.3 The Viscous Shear Stress -- 4.3.1 Laminar Flow Regime -- 4.3.2 Turbulent Flow Regime -- 4.3.3 Near-Wall Treatment -- 4.3.4 Initial Conditions -- 4.4 The MPI Implementation and Data Exchange -- 4.5 Fluid Flow Through a Porous Soil Sample -- 4.5.1 Analytical Solution of Soil Permeability -- 4.5.2 Numerical Model Configuration -- 4.5.3 Laminar Flow -- 4.5.4 Turbulent Flow -- 4.6 Numerical Investigation of Granular Sedimentation -- 4.6.1 The Settling of a Single Particle -- 4.6.2 Batch Granular Sedimentation -- 4.6.2.1 Segregation of Grains -- 4.6.2.2 Density Profile of the Suspension -- 4.6.2.3 Excess Pore Water Pressure and Effective Stress -- 4.6.2.4 Energy of Solid Grains in the System -- 4.6.2.5 Force Chain of the Sediments -- 4.7 Conclusions -- 5 Investigation of Submerged Debris Flows -- 5.1 Model Configuration -- 5.2 Physical Properties of Sediments -- 5.3 Dimensional Analysis -- 5.3.1 Discussion of the Dimensionless Groups -- 5.3.2 Summary of the Dimensionless Groups -- 5.4 Modelling of Small-Scale Submerged Debris Flows -- 5.4.1 Deformation of the Granular Assembly -- 5.4.2 Influence of Initial Column Aspect Ratio -- 5.4.3 Influence of Model Size Ratio -- 5.4.4 Influence of Characteristic Strain and Reynolds Number -- 5.4.5 Influence of Material Internal Friction Angle -- 5.5 Mechanical and Hydrodynamic Analyses -- 5.5.1 Evolution of Particle Velocity Field -- 5.5.2 Fluid Velocity Field -- 5.5.3 Relative Velocity Between Particle and Water -- 5.5.4 Distribution of Excess Pore Water Pressure -- 5.5.5 Evolution of Force Chains -- 5.5.6 Distribution of Effective Stress -- 5.5.7 Distribution of Bulk Coordination Number
Content:
5.5.8 Evolution of the Run-out Distance and Deposit Height -- 5.6 Modelling of Large-Scale Landslides -- 5.6.1 Determination of Numerical Time Step -- 5.6.2 The Mobility of Large-Scale Submerged Landslides -- 5.6.3 Mechanical and Hydraulic Behaviour of Loose Sample -- 5.6.3.1 Evolution of Particle Velocity Field -- 5.6.3.2 Evolution of Fluid Velocity Field -- 5.6.3.3 Relative Velocity Between Particle and Water -- 5.6.3.4 Evolution of Excess Pore Water Pressure -- 5.6.3.5 Evolution of Effective Stress -- 5.6.3.6 Evolution of Bulk Coordination Number -- 5.6.4 Mechanical and Hydraulic Behaviour of Dense Sample -- 5.6.4.1 Evolution of Particle Velocity Field -- 5.6.4.2 Evolution of Fluid Velocity Field -- 5.6.4.3 Relative Velocity Between Particle and Water -- 5.6.4.4 Evolution of Excess Pore Water Pressure -- 5.6.4.5 Evolution of Effective Stress -- 5.6.4.6 Evolution of Bulk Coordination Number -- 5.7 Conclusions -- 6 Conclusions and Recommendations for Future Work -- 6.1 Summary and Conclusions -- 6.2 Recommendations for Future Work -- Appendix A: Summary of the Selected Landslides -- Appendix B: Calculation of Porosity -- Appendix C: Input Parameters for Simulations -- References
Additional Edition:
9789811046261
Additional Edition:
Erscheint auch als Druck-Ausgabe Zhao, Tao Coupled DEM-CFD Analyses of Landslide-Induced Debris Flows Singapore : Springer Singapore,c2017 9789811046261
Language:
English
URL:
Volltext
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