有限元强度折减法对逐级开挖高边坡的稳定性分析

Stability analysis of finite element strength reduction method on stepwise excavating high slope

对常用的两种边坡稳定性评价方法进行了分析阐释。并利用有限元强度折减法对逐级开挖高边坡进行稳定性分析，发现在逐级开挖后安全系数之间都会增大。前四级平台开挖后安全系数增长较慢，仅为0．01～0．02，最后一级平台开挖对稳定性的影响最大，增加了0．04。同时，前四级平台开挖后滑带位置基本不变，后两级平台开挖后滑带位置发生明显变化。利用GEO-SLOPE对同等条件的工况进行安全系数的计算，发现计算结果与有限元强度折减法得到的结果近似，从而验证了有限元强度折减法应用的合理性。

The commonly used two methods of slope stability evaluation are interpreted. Using finite element strength reduction method,the high slope stability which is excavated stepwise is analyzed. It is found that the safety factors increase after it is excavated stepwise. The first four class platforms after excavation show that the safety factors increase slowly by 0. 02 at most,but after the last class platform is excavated,the safety factors increase sharply by 0. 04. Also,the slip zone's position basically remains unchanged after the first four class platforms' excavation,while the slip zone's position changes obviously after the last two class platforms' excavation. Finally,the safety factors calculated by GEO-SLOPE is similar to that calculated by the finite element strength reduction method. The results show the application of the finite element strength reduction method is reasonable.