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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。
In view of the safety problems such as instability of slope caused by the variation of groundwater table, the influence of different seepage of groundwater table on safety factor, displacement and effective normal stress of slope is studied by nonlinear dynamic time history analysis method based on finite element model. The results show that when the groundwater level is low, the increase of groundwater has little effect on the safety factor of the slope, and the impact on the slope stability is obvious when the change of the groundwater level reaches a certain level. With the increase of groundwater level, The maximum horizontal displacement is transferred from the upper part of the slope to the slope of the slope, and the maximum horizontal displacement spreads from the slope to the slope, indicating that the increase of groundwater level not only increases the slope deformation but also makes the slope slide facing The internal movement of the slope increased the sliding scale. The effective normal stress of the slope showed a decreasing-increasing-decreasing trend with the increase of the groundwater level, and the maximum value was produced at the foot of the slope, indicating that at the influence of the groundwater level Downhill foot slope is the most likely to damage the location of slope engineering safety protection design and calculation of guidance.