降雨条件下非饱和土边坡稳定耦合数值模拟  

Numerical Simulation of Unsaturated Soil Slope Stability Coupling under Rainfall

作　　者：王志成[1] 王鹏[1] 周威[1] 

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430056

出　　处：《路基工程》2010年第2期26-28,共3页Subgrade Engineering

摘　　要：降雨是影响边坡稳定的主要因素之一。降雨入渗,土体饱和度会发生变化,进而影响孔隙水压力与介质渗透系数。文章根据岩土饱和-非饱和渗流理论,考虑降雨入渗的影响,基于非饱和水土二相介质耦合,运用有限元强度折减法,对持续降雨条件下土质边坡进行了数值模拟。在不同时刻与不同降雨强度下,分析了降雨过程中边坡位移、孔隙压力和安全系数的变化规律。Rainfall is one of the main factors that influence the stability of slope. Rainfall infiltration will cause soil Saturation changing and further influence pore water pressure and medium permeability coefficient. Considering the influence of rainfall infiltration, and based on two-phase medium coupling of unsaturated water and soil, this paper carries out numerical simulation on soil slope under constant rainfall with strength reduction finite element method according to rock soil saturated-unsaturated infiltration theory. It also analyzes the changing rule of slope displacement, pore pressure and safety factor during rainfall at different period of time and different rainfall intensity.

关 键 词：非饱和土边坡 降雨入渗 耦合分析 强度折减 数值模拟 

分 类 号：U416.14[交通运输工程—道路与铁道工程]