基于有限元重度增加法的涉水岸坡稳定性分析研究

Research on the stability of wading bank slope based on finite element method of heavy added

本文以西藏某强风化岸坡为例,基于有限元软件PLAXIS,提出采用有限元重度增加法分析边坡在不同蓄水位时的岩土体应力应变特征,同时定量计算不同工况时该边坡的稳定性大小。结果表明:不同蓄水位时涉水岸坡的剪应力分布差别很小,但坡体内部剪应变分布区别相差较大,蓄水位越高,剪应变分布量越大;当山体内部处于稳定渗流状态时,蓄水位越高,边坡的稳定性越差;三种水位时的边坡滑裂面完全相同,均起于边坡临空面顶部,止于坡面中下部。研究成果对类似涉水岸坡的稳定性评估具有一定的参考价值。

In this paper,a highly weathered bank slope in Tibe was taken as an example.Based on the finite element software PLAXIS,the stress-strain characteristics of rock and soil mass under different storage levels were analyzed by using the method of finite element heavy added.Meanwhile,the stability of the slope under different conditions was calculated quantitatively.The results show that:the shear stress distribution difference of the wading bank slope under different storage levels is very small,but the shear strain distribution difference inside the slope is very lager,and the higher the storage level is,the larger the shear strain distribution is;when the mountain is in a stable seepage state,the higher the storage level is,the worse the stability of the slope is;the slope sliding surfaces at the three storage levels are identical,both start from the top of the free surface of the slope and end at the middle and lower part of the slope.The research results have certain reference value for the stability evaluation of similar wading bank slope.