Study On Deformation Characteristics And Forming Mechanism Of Landslide In Accumulation

Weijiayuanzi landslide in Langao county is a typical Accumulation landslides,it seriously threatened the surrounding people's lives and property safety.The stability of the landslide is generally based on the shear strength index of the slippery soil.However,the Accumulation landslides is controlled by the bedrock and overburden,and its variation and formation are different from the general landslide,So the choice of conventional rock and soil parameters as a management project design indicators is not comprehensive enough.Therefore,Studying the deformation characteristics and formation mechanism of the landslide is of great significance to optimize the ratio of the project management and to promote the development of the local economy.The study also has a certain significance for the survey and design of the same landslide Reference value.In this thesis,the deformation characteristics of the landslide,the physical and mechanical properties of the rock and soil and the response characteristics of the landslide to the rainfall infiltration under the rainfall conditions are studied by means of field investigation,laboratory test,small physical model and numerical simulation.Two-dimensional numerical simulation of landslide in the courtyard lands,revealing its deformation and failure mechanism.The following results were achieved:(1)Through the site investigation,the engineering geological conditions,rock and soil type,stratigraphic structure and so on were identified.(2)The physical and mechanical properties of the slippery soil and the bedrock in the landslide were studied by the indoor test.The parameters related to the landslide were measured and the influence curve of the water content on the strength of the rock and soil was obtained.It's the foundation of the physical model test and numerical simulation.(3)Through the physical model test and numerical simulation,the response characteristics of rainfall infiltration to slope stability and deformation and failure are analyzed and summarized.(4)The results of two-dimensional numerical simulation are analyzed and compared,and the formation mechanism of the landslide is revealed.It is considered that the typical reservoir stratigraphic structure is the decisive factor in the formation of the landslide.The rainfall infiltration leads to the enrichment of the water flow near the bedrock surface,which is an important predistorter of the landslide.The result of these two factors leads to the formation of the landslide.