地震诱发黄土滑坡稳定性评价中的不平衡推力法

The Imbalance Thrust Force Method in Stability Evaluation of Earthquake Induced loess landslide

以不平衡推力法为基础,同时考虑不同烈度、不同地震力作用方向条件下黄土滑坡的稳定性评价,以宁夏西吉回回川滑坡为例,进行了滑坡稳定系数K与地震系数KS,与地震作用角度β的关系及滑坡稳定性敏感性分析。结果表明地震最危险作用方向与水平方向有一定夹角倾向坡外,且随地震系数增大而增大。黄土滑坡稳定性评价中应该考虑地震最危险作用方向。

Based on the imbalance thrust force method, taking into account different seismic intensity and different direction of seismic force , taking Hui Huichuan loess landslide as an example, the relationship between stability factor and seismic coefficient as well as the 13 angle of seismic action has been discussed for analyzing the stability sensitivity. The results show that the critical direction of seismic force is with a certain angle of horizontal direction directing outwards the slope, and increases with seismic coefficient. The critical direction of seismic force should be considered in loess landslide stability analysis.