地下排水对滑坡稳定性影响动态研究

提出了考虑孔隙水压力的滑坡稳定性计算方法，对工程中常用的不平衡推力法进行改进。以某个水电工程滑坡为例，采用FLAC3D进行三维数值分析，对滑坡在地下隧洞排水过程中的孔隙水压、水位及流量等变化进行了模拟。利用FLAC3D计算结果，并使用FISH语言编程，得到改进后的不平衡推力法的所需数据，对滑坡的稳定性变化进行了动态研究。计算结果表明，上述方法很好地反映了地下排水过程中稳定性增长过程，同时表明常规的计算方法低估了地下排水在提高滑坡稳定性和降低剩余下滑力方面的作用。

Dynamic effect of underground drainage on stability of landslide

The method of the stability calculation of landslide with pore pressure is presented and an amelioration for the imbalance force method is done. A three-dimensional numerical simulation with FLAC3d has been carried out for a landslide of a hydropower station to study the pore pressure, phreatic level and flow discharge, which affected by the subhorizontal drainage holes, during the drainage period. The research of the stability change of the landslide is accomplished by the amelioration imbalance force method with the data achieved from the simulation results of FLAC3d with a program written by FISH language. The results indicate that the procedure of the stability expansion is represented properly by the amelioration method. The degrees of increased stability and the decreased imbalance force are underestimated with normal methods during the drainage period.