库水位涨落与降雨联合作用下绿草码头滑坡渗流场分布规律及稳定性分析

滑坡体的稳定性对水库的安全运行有重大影响,而地下水的运动是影响滑坡体稳定性的重要因素。结合现场调查,采用饱和—非饱和渗流分析法研究了库水位涨落与降雨联合作用下滩坑水电站库区绿草码头滑坡体的渗流场,并在此基础上采用极限平衡分析法分析了滑坡可能的失稳破坏模式与程度,评价了滑坡在库水涨落与天然降雨联合作用下滑坡的稳定性变化规律。结果表明,库水涨落与天然降雨联合作用对滑坡稳定性有不利影响,滑坡存在渐近失稳的可能,需加强对滑坡的监测和巡查,以掌握滑坡体的变形发展趋势。

Seepage Field Distribution and Stability Analysis of Lvcao Wharf Landslide under Effects of Water Level Fluctuation and Rainfall

The stability of landslides has significant influences on the safe operation of reservoir while one important factor involved in stability analysis of landslides is the movement of underground water. Based on the current characteristics of the Lvcao Wharf landslide located in the reservoir area of Tankeng hydropower station, saturation-unsaturation seepage analysis is used to study the seepage filed considering the effects of reservoir water level fluctuation and rainfall. And then, the potential failure mode and scale of the landslide are analyzed by limit equilibrium method. Finally, the variation of the landslide stability is evaluated. The results show that the water level fluctuation and rainfall have adverse impact on the stability of the landslide, and the progressive failure of the landslide could possibly be induced. To understand the trend of deformation of the landslide, it is essential to perform monitoring and inspection of the landslide.