水位快速变动下边坡稳定性分析

针对库区水位快速变动引起坡体内渗流场的变化、应力场变化,滑带的抗剪强度参数的降低、坡体稳定性变化。在考虑水土共同作用和水位波动速度情况下,通过FLAC3D软件进行了水位变化过程坡体渗流场数值模拟。结果表明:上升过程中安全系数随时间的变化表现为上升下降型,随水位的变化表现为下降上升型;下降过程中安全系数随时间的变化、随水位的变化都呈现为下降上升型。水位下降工况对边坡稳定影响最不利,在坝堤设计时应充分予以重视。

Analysis of Slope Stability Based on Interaction Between Water and Soil

According to the seepage field varying in landslide body,the shear strength index of soil,the stress field,the safety factors and so on and considering the interaction between water and soil and the velocity of water level variation,the numerical simulation is carried out by using the finite difference software FLAC3D.The results show that the safety factor changes with time is the increase-down type and the safety factor changes with water level is embodied in the down-increase type during water level rising,and all behave as the down-increase type during water level dropping down.The condition of water level dropping down is the most adverse factor to slope stability,and should be paid attention to fully in the design of dams.