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通过研究给定湿润锋深度条件下花岗岩残积土边坡的系统可靠度,追踪湿润锋位置的变化,提出了考虑时变效应的花岗岩残积土边坡系统可靠度分析方法.研究表明,随着降雨时间的增加,边坡上层饱水层位置不断下移.当饱水层位置较浅时,边坡失效概率受最危险滑动面位置控制,且最危险滑动面位于非饱和土层中.随着饱水层厚度增加,边坡失效概率受两个分别位于饱水层和非饱和土层中的滑动面控制,系统效应明显.当饱水层厚度增加到一定程度时,边坡失效概率受位于饱水层中的最危险滑动面控制.对应地,边坡的时变可靠度的发展也分为3个阶段.提出的方法可以有效计算强降雨条件下花岗岩残积土边坡的系统可靠度.
By analyzing the system reliability of granite residual soil slope under a given wetting front depth and tracking the change of wetting front position, a reliability analysis method of granite residual soil slope system considering time-varying effect is proposed. The results show that with the rainfall As the time increases, the position of the upper aquifer in the slope continues to decline. When the position of the aquifer is shallow, the failure probability of the slope is controlled by the position of the most dangerous slip surface and the most dangerous slip surface is located in the unsaturated soil layer When the thickness of the saturated aquifer increases to some extent, the failure probability of the slope is controlled by two sliding surfaces located in the saturated and the unsaturated soil, respectively, and the system effect is obvious. When the thickness of the saturated aquifer increases to some extent, And the most dangerous sliding surface control in saturated water.The corresponding time-dependent reliability of the slope is also divided into three stages.The proposed method can effectively calculate the system reliability of the granite residual soil slope under heavy rainfall conditions.