基于降雨入渗概化模型的王家台滑坡岩土参数反演分析

中国是滑坡灾害的多发国家,其中降雨是诱发滑坡灾害的主要原因.由于地质体具有非连续、非均匀、流固耦合、未知初始状态等特点,仅依靠有限的钻孔数据无法准确给出滑坡体的渗流参数及岩土力学参数.为了实现降雨入渗作用下滑坡体参数的快速反演,提出了可快速分析降雨入渗诱发滑坡灾害的力学模型.该模型根据降雨量、地表径流量及地下径流量综合...

Back-analysis of geotechnical parameters of Wangjiatai landslide based on generalized rainfall infiltration model

China is a country with many landslide disasters, in which rainfall is the main reason to induce landslide disasters. Because the geological body is characterized by discontinuity, inhomogeneity, fluid-solid coupling and unknown initial state, it is difficult to accurately determine the seepage parameters and geotechnical parameters of the landslide body only by relying on the limited borehole data. In order to realize rapid inversion of landslide parameters under rainfall infiltration, a mechanical model which can quickly analyze the landslide disaster induced by rainfall infiltration is presented. In this model, the saturation degree in the sliding body is determined according to the rainfall, surface flow and subsurface, and then the strength of the sliding body is decreased or increased according to the saturation. By embedding the model in continuum-discontinum element method (CDEM) and combining with genetic algorithm, the inversion analysis of geotechnical parameters of Wangjiatai landslide is realized. After optimization comparison between monitoring data and numerical simulation, the current geotechnical parameters of Wangjiatai landslide which is suitable for the generalized model of rainfall infiltration are given.