1st Edition
Rainfall-Induced Soil Slope Failure Stability Analysis and Probabilistic Assessment
Rainfall-induced landslides are common around the world. With global climate change, their frequency is increasing and the consequences are becoming greater. Previous studies assess them mostly from the perspective of a single discipline—correlating landslides with rainstorms, geomorphology and hydrology in order to establish a threshold prediction value for rainfall-induced landslides; analyzing the slope’s stability using a geomechanical approach; or assessing the risk from field records.
Rainfall Induced Soil Slope Failure: Stability Analysis and Probabilistic Assessment
integrates probabilistic approaches with the geotechnical modeling of slope failures under rainfall conditions with unsaturated soil. It covers theoretical models of rainfall infiltration and stability analysis, reliability analysis based on coupled hydro-mechanical modelling, stability of slopes with cracks, gravels and spatial heterogenous soils, and probabilistic model calibration based on measurement. It focuses on the uncertainties involved with rainfall-induced landslides and presents state-of-the art techniques and methods which characterize the uncertainties and quantify the probabilities and risk of rainfall-induced landslide hazards.Additionally, the authors cover:
- The failure mechanisms of rainfall-induced slope failure
- Commonly used infiltration and stability methods
- The infiltration and stability of natural soil slopes with cracks and colluvium materials
- Stability evaluation methods based on probabilistic approaches
- The effect of spatial variability on unsaturated soil slopes and more
Introduction
Slope Failures under Rainfall and Failure Mechanisms
Recent Advances and Hot Research Topics
Outline of the Book
References
Infiltration and Seepage Analysis in Soil Slopes
Introduction
Estimation of Infiltration Rate Based on Conceptual Model
Seepage Analysis in Unsaturated Soil Slopes Based on Physical Governing Equation
Analytical Solutions of the Richards Equation
Numerical Analysis of the Richards Equation
Typical Pore-Water Pressure Profiles under Rainfall Condition
Soil Conditions under Which Matric Suction Can Be Maintained
References
Stability Analysis of Slope Under Rainfall Infiltration Based on Limit Equilibrium
Introduction
Infinite-Slope Stability Analysis Based on 1D Infiltration Profile
Slope Stability Analysis Based on Limit Equilibrium Methods
Controlling Factors for Rainfall-Induced Landslides
Spatially Distributed Model of Hazard Assessment of Rainfall-Induced Landslides
References
Coupled Hydromechanical Analysis for Unsaturated Soil Slope
Introduction
Modeling of Unsaturated Soil Based on Continuity Mechanics
Slope Stability Analysis Based on Coupled Modeling
Illustrative Examples
References
Stability of Soil Slope with Cracks
Introduction
Prediction of Unsaturated Hydraulic Functions of Cracked Soil
Example
Stability of Soil Slope with Cracks
References
Stability Analysis of Colluvium Slopes upon a Rainstorm
Introduction
Hydraulic Properties of Colluvial Soils
Shear Strength of Colluvial Soils
An Example
References
Reliability Analysis of Slope under Rainfall
Introduction
Fundamental Concept of Reliability
Reliability Methods and Applications on Slope Stability
Uncertainties of Soil Properties
Effects of Uncertainty of Hydraulic Properties on Infiltration and Slope Stability
Reliability Analysis of Rainfall-Induced Slope Failure: An Example of the Sau Mau Ping Landslide
Quantitative Risk Assessment of Landslide and Risk Acceptance Criteria
References
Probabilistic Assessment of Random Heterogeneous Soil Slopes
Spatial Variability of Soils
Random Field Theory
Modeling of Random Field
Seepage and Stability of a Random Heterogeneous Slope under Rainfall Infiltration
References
Probabilistic Model Calibration
Introduction
Probabilistic Model Calibration within Bayesian Framework
Markov Chain Monte Carlo Simulation Method
Procedures for Probabilistic Model Calibration and Prediction
Example 1: A Cut Slope Failure
Example 2: Lai Ping Road Landslide
Example 3: An Instrumented Site of Natural Terrain in Hong Kong
References
Biography
Lulu Zhang Lulu is a professor at Shanghai Jiaotong University, China.
Jinhui Li
is an associate professor at Harbin Institute of Technology, China.Xu Li
is an associate professor at Beijing Jiaotong University, China.Jie Zhang
is an associate professor at Tongji University, China.Hong Zhu
is a research assistant at Hong Kong University of Science and Technology."The authors are to be commended for bringing together the many components related to rainfall induced landslides. I foresee that this book will be well-received by practicing engineers and researchers, and I believe that the book will form a reference book that is in demand in university libraries. I am sure that the book will be in demand and meet an important need."
—Delwyn G. Fredlund, Professor Emeritus, University of Saskatchewan, Canada"This book concisely presents the fundamental mechanics behind rain-induced soil slope failures: rainfall infiltration in soil slopes, slope stability under rainfall infiltration, and hydro-mechanical coupled deformation. The concepts and analyses are presented clearly from the first principle with a strong physical sense. Some advanced topics, such as hydro-mechanical coupled numerical analysis in unsaturated soils, are approached in a plain manner with hand-on tutorials. The analysis of the stability of slopes with cracks is an excellent addition—practitioners are aware of the vital importance of cracks but few have the knowhow to quantify cracks and their effects. The book is therefore an excellent text for graduate students and a good reference for geologists and engineers."
—Limin Zhang, Hong Kong University of Science and Technology"The book is an important contribution to unsaturated soil mechanics and slope stability analysis... The authors present state-of-the art techniques in analysis and provide an exhaustive bibliography."
--Wei Wu, Acta Geotechnica
