降雨入渗条件下无限边坡的稳定性分析

用Iverson解析解描述降雨入渗,并采用Mohr-Coulomb强度准则,对降雨过程中平移模式下无限均质边坡的水平位移进行弹塑性计算,据此分析边坡安全系数和滑坡前坡面水平位移的关系,并探讨土坡的抗剪强度参数、降雨强度和初始应力状态对边坡安全系数和水平位移的影响.结果表明,对于抗剪强度参数较小的无限边坡,在较大的降雨强度作用时,滑坡很快就会发生,且滑坡前的水平位移较小,但初始应力状态对滑坡发生的时间没有影响.

Stability Analysis of Infinite Slopes Under Rainfall Infiltration

This paper gives an analysis of the horizontal displacements that take place in an infinite and homogeneous slope,consisting of an elastic-plastic Mohr-Coulomb material,with the translational slide due to the rainfall infiltration using the Iverson model.An attempt is made to establish a relationship between the horizontal displacement before failure and the slope safety factor.The influences of the initial state of stress,the shear strength of soil and the rain intensity on the slope safety factor and the horizontal displacements are investigated.It is illustrated that,for an infinite slope consisting of the soil with the less shear strength under the greater rainfall intensity,the sliding failure befalls soon and the horizontal displacement before failure is relatively small,while the time of slope sliding failure is not influenced by the initial state of stress.