本书分析了降雨入渗过程中降雨入渗与部分饱和土坡变形的耦合作用。利用极限平衡条件和部分饱和土的抗剪强度关系，建立了计算降雨入渗引起的无限部分饱和边坡稳定性的解析解。解析解可以考虑耦合效应对边坡稳定性的影响。讨论了影响无限范围部分饱和边坡安全性的因素。研究了降雨对土质边坡的渗流、空气迁移、变形和稳定性的影响。湿润锋受孔隙空气运移和土体变形的影响，结果表明，降雨入渗与变形的孔-机械耦合对非饱和边坡的稳定性有重要影响。各向异性对孔隙水压力的影响与非饱和土边坡的深度和位置有关。

1 Background
1.1 Physical Properties of Unsaturated Infiltration
1.1.1 Basic Physical Properties
1.1.2 Soil Suction
1.1.3 Unsaturated Hydraulic Conductivity
1.1.4 Total Head
1.1.5 Soil-Water Characteristic Curve
1.2 Governing Equation of Water Infiltration
1.2.1 Richards' Equation
1.3 Shear Strength and Slope Stability
1.3.1 Unsaturated Shear Strength
1.3.2 Slope Stability
References
2 Analytical Solution to 1D Coupled Infiltration and Deformation
in Unsaturated Porous Media
2.1 Introduction
2.2 Effect of Rainfall Pattern
2.2.1 Governing Equations for Coupled Seepage and Deformation
2.2.2 Analytical Solutions to 1D Coupled Infiltration Problems Before and After Ponding
2.2.3 Examples and Analysis Results
2.2.4 Conclusions
2.3 Effect of Boundary Condition
2.3.1 Coupled Infiltration Equations
2.3.2 Solution for Infiltration into Deformable Soils
2.3.3 Example
2.3.4 Conclusions
2.4 Effect of Layered Structure
2.4.1 Governing Equations
2.4.2 Parametric Study
2.4.3 Conclusions
Appendix
References
3 Effects of Gravity and Hysteresis on 1D Unsaturated Infiltration
3.1 Introduction
3.2 Effect of Gravity
3.2.1 Governing Equation
3.2.2 Boundary and Initial Conditions
3.2.3 The Analytical Solutions for Transient Unsaturated Infiltration
3.2.4 The Analytical Solution for Steady Unsaturated Infiltration
3.2.5 Case Study and Analysis
3.2.6 Summary
3.3 Effect of Hysteresis
3.3.1 Brief Review of Hysteretic Soil-Water Characteristic Models
3.3.2 Mathematical Formulations for Hysteresis
3.3.3 Analytical Solutions Considering Hysteresis
3.3.4 Analysis Examples
3.3.5 Conclusions
3.4 Effect of Semi-infinite Region
3.4.1 Governing Equation
3.4.2 Parametric Study
3.4.3 Conclusions
References
4 2D Infiltration in Unsaturated Porous Media
4.1 Introduction
4.2 Analytical Solution to Finite Domain
4.2.1 Governing Equation of Coupled Infiltration Problems
4.2.2 Formulation of the Initial Value Problem
4.2.3 Analytical Solutions to Two-Dimensional Coupled Infiltration
4.2.4 Numerical Results
4.2.5 Conclusions
4.3 Numerical Solution to Water Table Rise
4.3.1 Governing Equations for the Hydromechanical Processes Involved in Water Table Change
4.3.2 Computational Modeling
4.3.3 Examples of Water Infiltration
4.3.4 Discussion and Conclusions
4.4 Surface Infiltration in Semi-infinite Extent
4.4.1 Governing Equations for Coupled Seepage and Deformation in Unsaturated Soils
4.4.2 Analytical Solution to the Coupled Infiltration in a Semi-infinite Region
4.4.3 Computational Modeling of Water Infiltration in a Semi-infinite Unsaturated Region
4.5 Conclusions
References
5 Physical Simulation of Rainfall Infiltration into Unsaturated
Slopes
5.1 Introduction
5.2 Physical Testing of Rainfall-Induced Loose Deposit Slope Failures
5.2.1 Model Design
5.2.2 Analysis of the Slope Model Experiments
5.2.3 Conclusions
5.3 Laboratory Simulation of Rainfall-Induced Loess Slope Failure
5.3.1 Methods
5.3.2 Results and Analysis
5.3.3 Numerical Analysis
5.3.4 Conclusions
5.4 Model Test for Rainfall-Induced Shallow Landslides in Red-Bed Area
5.4.1 Geographic and Geologic Setting
5.4.2 Theoretical Modeling of Rainfall-Induced Shallow Landslides
5.4.3 Laboratory Model Testing of Rainfall-Induced Landslides
5.4.4 Verification of the Infiltration Analysis Model
5.4.5 Comparative Analysis of the Shallow Landslide Model
5.4.6 Conclusions
References
6 Slope Stability Analysis Based on Coupled Approach
6.1 Introduction
6.2 Hydromechanical Process of Soil Slope Under Rainfall
6.2.1 Equations Governing Coupled