降雨及库水位耦合下白水河滑坡变形机理分析

Analysis on Deformation Mechanism of Baishui River Landslide under Rainfall and Reservoir Water Level Coupling

降雨和库水位的升降对三峡库区滑坡稳定性有重要影响.根据饱和非饱和土的渗流理论及极限平衡原理方法,采用加拿大岩土有限元软件Geo-Studio,对白水河滑坡在多种工况下的渗流场及稳定性进行计算,包括在库水位175m^145m波动下,6种设计工况和2015年实际工况.通过对白水河滑坡稳定性计算结果及现有的监测数据综合分析,表明白水河滑坡稳定性同时受库水位波动和降雨入渗影响,库水位消落是滑坡变形的主要因素.计算分析结果为三峡库区涉水滑坡变形机理研究及预测提供一定的参考.

The rise and fall of rainfall and water level of three gorges reservoir area landslide deformation in- stability plays an important influence factor, according to the saturated unsaturated soil seepage theory and principles of limit equilibrium method, the Canadian geotechnical finite element software Geo-Studio, to the white river seepage field and stability of the landslide in various working conditions is calculated and included in the 175m-145m water fluctuation, the working condition of 6 kinds of design and actual working condition in 2015. Through to the white river landslide of the existing monitoring data analysis, the results show that white river landslide stability affected by water level fluctuation and rainfall infiltration at the same time, the water level down is the main factor of landslide deformation. The analysis result is a reference for the deform- ation mechanism and prediction of the landslide in the three gorges reservoir area.