降雨作用下老滑坡复活变形机理研究

Study on mechanism of revavil and deformation of old landslide under rainfall

以重庆市铜梁县西泉街滑坡为例,在资料的收集整理和分析、现场工程地质调查以及结合室内外的物理力学试验的基础上,首先对滑坡的水文地质条件进行调查,进而采用极限平衡理论对滑坡稳定性进行计算和评价,最后应用弹塑性有限元算法对滑坡不同饱水状态下的稳定状态进行模拟计算,验证了稳定性计算的结果。分析了降雨作用下老滑坡的复活变形过程,揭示了降雨型老滑坡的复活变形机理,为该类滑坡的稳定性评价提供了有益的指导。

Connected with the engineering concrete example of landslide of XiQuan in Tongliang county, Chongqing city, through the collection, arrangement and analysis of related date, the site investigation and exploration of engineering geology, indoor and outdoor physico-mechanical test, first, analyze the evolvement mechanical by the characteristic of hydrogeological, and then adopting the theory of limit equihbrium to calculate and evaluate stability of landslide, in the end, adopting contact elastoplastic FEM to verify validity about the result. Its process of the revival and deformation under rainfall were analyzed, which the mechanical of revavil and deformation of old landslide under rainfall are revealed, and it may afford one method that can be used as a reference of stability analysis.