地震作用前后极限平衡法和强度折减法的边坡稳定分析对比

Before and After Earthquake Actions of Slope Stability Analysis with Limiting Equilibrium Method and Strength Reduction Method

分别运用极限平衡法和ANSYS强度折减法对国内某边坡地震作用前后稳定性进行了分析,考虑地震作用时采用了拟静力法施加水平和垂直两个方向的地震力。根据地震作用前后两种方法得到的边坡稳定系数、滑动面、滑动体的对比分析发现,两种方法得出的安全系数、滑动面相差不大,说明了强度折减法运用到边坡稳定分析中是合理的。强度折减法得出安全系数均比极限平衡法略大,这是由于强度折减法考虑了土体的应力-应变关系,使得计算结果更符合实际。通过地震作用前后边坡的水平位移图的对比,总结了一些规律,为地震区边坡的锚固提出相应的建议。

Respectively comparative study on limiting equilibrium method and ANSYS strength reduction method for the slope stability analysis under the earthquake action. Consider the role of the earthquake in the pseudo-static method applied vertical and hori- zontal directions of the earthquake force. According to before and after the earthquake action the two methods for slope stability coeffi- cient, sliding surface and sliding body contrast analysis draw some conclusion. Two methods of safety factor and sliding surface that dif- fers little, it is indicated that the strength reduction method applied to the slope stability analysis is reasonable. The strength reduction method that safety coefficient are slightly larger than the limit equilibrium method, this is due to the strength reduction method consid- ering the relationship between the stress and the strain of soil, making the calculation results accord well with practice even more. Through the contrast of horizontal displacement diagram before and after the earthquake action can be found that regular, put forward the corresponding suggestions for earthquake zones of the slope anchor.