针对地下水位变化易引发边坡失稳破坏等安全问题,基于有限元模型采用非线性动力时程分析方法研究不同地下水位渗流作用对边坡安全系数、位移和有效正应力的影响规律.研究表明:当地下水位较低时,地下水的升高对边坡安全系数影响不大,当地下水位变化达到一定高度后则对边坡稳定性影响较明显;随着地下水位的增加,边坡最大水平位移位置由边坡坡面中上部向边坡坡脚转移,且最大水平位移范围由边坡坡面向坡内扩散,表明地下水位升高不仅增加了边坡变形,还使边坡滑动面向边坡内部移动,增加了滑动规模;边坡坡面有效正应力随地下水位增加表现出减小-增大-减小的趋势,并在边坡坡脚处产生最大值,表明在地下水位影响下坡脚是边坡最容易破坏的位置,对边坡工程安全防护设计与计算具有指导意义.%Amid at the change of groundwater level,it is easy to cause some safety problems of instability and failure of slope.Based on the finite element model,by using the method of nonlinear dynamic time history analysis,the influence laws on the slope safety factor,displacement and effective normal stress by different groundwater seepage are studied.The research results show that when the groundwater level is low,the influence to the slope safety factor by the rising of groundwater level is less.When the change of groundwater level reaches a height,the rising of the groundwater level will have a significantly effect on the slope stability.With the increasing of groundwater levels,the maximum horizontal displacement position of slope extends from the middle-upper part to the toe,and the maximum horizontal displacement spreads from the slope surface to the inside of slope.The rising of groundwater level not only increase the slope deformation but also makes the slope sliding face to the inside of slope,it increases the sliding scale.The effective normal stress along the slope shows a decreasing-increasing-decreasing trend with the increasing of groundwater level,and the maximum value appears at the slope toe,which shows that the slope toe is the most easily to be destroyed by groundwater level,which provides guiding significance for the design and calculation of safety protection of slope engineering.
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