强度折减法在滑坡稳定性分析中的应用

Strength reduction FEM applied to landslide stability analysis

沁水县侯村煤矿边坡处治后,I^III段使用良好,IV段抗滑挡墙失效。本文采用有限元强度折减法计算,强度指标比原定的降低了1.29倍。同时,在折减过程中,通过计算分析剪应力集中部位,确定滑面是在老滑面的基础上发展的部分新滑面,形成新的剪出口。利用折减后强度参数,计算对比新滑面与次级滑面的滑坡推力,认为挡墙破坏为新滑面推力过大所致,与原设的“次级滑面为最危险滑面”情况不符,计算结果与实际情况较吻合。

As reinforceing, the Houcun slope in Qingshui County, Shanxi Province,Ⅰ-Ⅲ segment projects was worked well while the restaining wall in the Ⅳ segment was broken down. Using strength reduction FEM, the calculated C, ψ value is 1.29 times less than the tested value. In the reduction, a new slide surface is produced on the concentration of shearing stress and this new slide surface is calculated as a new shear outlets. The thrusting force is compared between the new slide surface and the old one. It is calculated that the restaining wall is broken because of the new thrusting force . The calculation results is consistent with the real condition.