基于库水位涨落与降雨耦合作用下新田崩塌体变形分析

三峡库区水位调动不断影响沿岸的地质条件,沿岸涉水滑坡与崩塌体变形严重,为分析水位变化与降雨对沿岸的作用,以新田崩塌体为研究对象,通过现场地质调查及工程测量,建立崩塌体计算模型,采用数值模拟方法对该崩塌体在库水位变化、降雨和二者耦合作用工况条件下的变形破坏进行分析,在二维模型中利用Morgenstern-Prince法对新田崩塌体在不同工况下进行稳定性计算,同时建立三维崩塌模型进一步研究崩塌体破坏机理,在数值模拟中监测应力、位移、孔隙水压力及等效塑性应变的变化,结果表明：水位骤降与强降雨同时作用下对对新田崩塌体的变形影响很大,同时在最不利工况下,利用计算结果建立崩塌体变形破坏的数值预测模型,为崩塌体的后期防治提供参考。

Analysis of Xintian Collapsed Body Deformation Based on the Coupling Action of Reservoir Water Level Fluctuation and Rainfall

The adjustment of the water level in the Three Gorges Reservoir area continuously affects the geological conditions along the coast. Coastal wading landslides and collapsed bodies are seriously deformed. In order to analyze the effects of water level changes and rainfall on the coast, the Xintian collapsed bodies are taken as the research object. Through on-site geological survey and engineering surveys, A calculation model of the collapsed body was established, and numerical simulation methods were used to analyze the deformation and failure of the collapsed body under the conditions of reservoir water level changes, rainfall and the coupling of the two. The Morgenstern-Prince method was used to analyze the Xintian collapsed body in the two-dimensional model. Carry out stability calculations under different working conditions, and establish a three-dimensional collapse model to further study the failure mechanism of collapsed bodies. In the numerical simulation, the changes of stress, displacement, pore water pressure and equivalent plastic strain are monitored. The results show that: Simultaneous rainfall has a great influence on the deformation of the collapsed body in Xintian. At the same time, under the most unfavorable conditions, the numerical prediction model of the deformation and failure of the collapsed body is established by using the calculation results to provide a reference for the later prevention and control of the collapsed body.