STABILITY ANALYSIS OF ANCIENT DEBRIS LANDSLIDE
碎石土古滑坡稳定性分析

In order to accurately evaluate the stability of ancient debris landslide,through the collection,arrangement and analysis of related data,the site investigation and exploration of engineering geology,indoor and outdoor physico-mechanical tests,adopting the analytic means of mathematic statistics,unbalanced-thrust method and three-dimensional large deformation contact elastoplastic finite element algorithm,and the theory of groundwater pipe network drainage system,connected with the engineering concrete example of Zhezhouling revived ancient debris landslide in Zhejiang Province,its process of the reviving and failure under rainfall was analyzed.Furthermore,this landslide stability was analyzed and computed also.Meanwhile,with other engineering concrete examples,the applicability of contact elastoplastic finite element algorithm used to analyze the debris landslide stability was studied.The research results show that to analyze the stability of ancient debris landslide by the three-dimensional large deformation elastoplastic finite element contact algorithm may consider the spatial effect of landslide mass,which makes computation result still be more accurate.Secondly,adopting the three-dimensional large deformation contact elastoplastic finite element algorithm with the action of rainfall may better reflect the actual locating state and sliding process of ancient debris landslide under the action of rainfall;and it may afford one method that can be used as a reference to the stability analysis,accurate evaluation and forecast of this type of landslide.Additionally,for shallow debris landslide,medium and deep one,and ancient one,two-dimensional and three-dimensional small deformation contact elastoplastic finit element algorithm and three-dimensional large deformation one were separately adopted to analyze the stability of corresponding debris landslide,in which the satisfactory computation result according with the reality can be achieved.