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降雨是滇西土质滑坡灾害的主要诱发因素,而滑坡土体中孔隙水压力的存在使得岩土体的力学性状变得更加复杂.选择滇西红层典型土质滑坡-思铺滑坡做深入的调查,考虑降雨入渗的影响,基于饱和-非饱和渗流理论,选择9月份的降雨量监测资料,对强降雨条件下思铺滑坡地下水动态渗流场进行了数值模拟,将其孔隙水压力结果用于滑坡稳定性分析.同时,又基于非饱和土强度理论,采用GLE通用条分法,对滑坡稳定性的时空效应进行了评价,从而得出降雨入渗与土质滑坡的内在联系:滑坡稳定性与其渗流滞后性有较好的对应关系,最危险滑动面随含水量不同而呈空间的演变.
Rainfall is the main inducing factor of landslide disaster in western Yunnan, and the existence of pore water pressure in the landslide makes the mechanical properties of rock and soil become more complex.Selecting the typical red earth landslide in western Yunnan - Sipu landslide to do in-depth investigation Considering the influence of rainfall infiltration, based on the saturated-unsaturated seepage theory, the rainfall monitoring data of September were selected to simulate the dynamic seepage field of groundwater in Sipu landslide in heavy rainfall. The results of pore water pressure Landslide stability analysis.At the same time, based on the theory of unsaturated soil strength, GLE generalized slice method is used to evaluate the space-time effect of landslide stability, and the inherent relationship between rainfall infiltration and soil landslide is obtained: the stability of landslide Seepage lag has a good correspondence, the most dangerous sliding surface with the water content of different space evolution.