渗流-应力耦合及降雨入渗作用下的边坡稳定性分析

Slope Stability Analysis under Seepage-Stress Coupling and Rainfall Infiltration

为了探究地下水和降雨入渗对边坡稳定性的影响,在分析强度折减法原理和渗流-应力耦合机理的基础上,建立了渗流-应力耦合数学模型;运用有限元数值模拟软件ABAQUS,计算出无地下水、有地下水以及地下水和降雨入渗共同作用三种工况下的边坡安全系数,并探讨了不同粘聚力、内摩擦角、弹性模量、泊松比、渗透系数、水头高度、降雨时间和降雨强度对边坡稳定性的影响。计算结果表明:地下水和降雨入渗会对边坡稳定性产生较大不利影响;边坡安全系数随粘聚力和内摩擦角的增大而增大,随水头高度、降雨时间和降雨强度增大而减小;而弹性模量、泊松比、各向同性的渗透系数对边坡安全系数几乎没有影响。

In order to explore the influence of groundwater and rainfall infiltration on slope stability,the mathematical model of seepage-stress coupling mechanism is established by analyzing the principle of strength reduction and seepage-stress coupling mechanism.Using the finite element numerical simulation software ABAQUS,slope safety factor is calculated under three working conditions of no water, groundwater and the interaction of groundwater and rainfall infiltration.And the influence of different cohesive force,internal friction angle,elasticity modulus, Poisson ratio,permeability coefficient,water head height, rainfall duration and rainfall intensity on the slope stability is discussed.The results show that ground water and rainfall infiltration will affect the slope stability adversely.Slope safety factor increases with the increase of cohesive force and internal friction angle,and it is inversely proportional to water head height, rainfall duration and rainfall intensity.However,the elasticity modulus,Poisson ratio and the isotropic permeability coefficient have little influence on slope safety factor.