水位快速变动下边坡稳定性分析

Analysis of Slope Stability on the Condition of Rapid Fluctuation of Water Level

水位快速变动的库区边坡内渗流场的变化是引起边坡失稳滑动的一个重要因素。渗流场的变化一方面降低了滑带的抗剪强度参数,另一方面影响其应力场,从而导致滑坡破坏。取一理想边坡,通过FLAC3D数值模拟软件,计算得到: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、水位的变化都呈现为下降上升型,下降工况对边坡稳定影响最不利。

An important factor of the landslide is the change of seepage field in slope.On the one hand,the shear strength index of soil is reduced by the seepage field change;on the other hand,the stress field in slope is also directly impacted by the seepage field change,so the landslide is induced.The numerical simulation is established by using the software of FLAC-3Dand the results show that：the safety factor change with time is increase-down type and the safety factor change with water level is down-increase type during water level rising,and all change is down-increase type during water level dropping down.The dropping down condition of water level is the most adverse factor to slope stability.