库水位变化对库岸滑坡稳定性影响的预测研究

摘要

Landslide stability affected by long-term reservoir water level fluctuation is predicted by finite equilibrium method considering the coupling between seepage field and stress field. Shaiwangba landslide in the Three Gorges Reservoir area is taken as a case study. Through numerical calculation, the stability factor considering the displacement incremental variable and pore water pressure incremental variable is acquired. By analyzing the stability factor during the decrease of reservoir water level in 5 hydrological years, the nonlinear fitted curve of minimum stability factor is obtained. Results show that the stability factor tends to be steady at 1. 172, and the landslide phreat-ic line tends to be constant with the variation of reservoir water level. It' s concluded that deformation will take place at the Shaiwangba landslide during the first 2-3 years after the impoundment, and will remain stable in subsequence.%以三峡库区晒网坝滑坡为研究对象,在充分考虑双场耦合的条件下,结合极限平衡分析法,得到了库水位变化过程中考虑位移增量和孔隙水压力增量的库岸滑坡稳定性系数的计算方法,并对库水位变化作用下晒网坝滑坡的长期稳定性进行分析.结果显示:随着时间的变化,稳定性系数逐步趋于一定值1.172,且坡体内浸润线也随着库水位的调度逐步保持稳定,趋于不变.