Study On The Stability Of Glacial Landslides In Palong Zangbo Watershed In Southeastern Tibet

The glacial till landslide of the southeastern tibet Palongzangbu basin is one of the major geological disasters in this region,the stability of the landslide affects the development of this region.Under the geological processes of glacier in this area,forms a large number of the glacial till accumulation body in the Palongzangbu basin,because the characteristics of the glacial till are different from the general soil,the unique geology tectonic characteristics are unique in this region,form the glacial till landslide that is different from the general soil landslide.This paper,through the indoor experiment about the geological survey,the in-situ soil test and the glacial till sampling for the glacial till landslide in this area,obtains the soil mechanics parameters of the glacial till landslide in this area,combining with the survey results for the glacial till landslide,analyzes the main factors affecting the stability of the glacial till landslide.Through analyzing the mechanical parameters of the different glacial tills,carries out the sensitivity analysis for the stability coefficient of the glacial till landslide.Then,taking the typical glacial till landslide in this area as the research object,respectively adopting the Sweden slice method and the numerical simulation method,carries out the stability analysis for the Pailonggou glacial till landslide selected.This article mainly obtains the following knowledge and the research result:1.Investigates the glacial till landslide in the Palongzangbu basin,analyzed the current situation of the glacial till landslide,and found out the basic form of the landslides in this region and the major factors affecting the stability of the glacial till landslide in the studied area;2.Through the permeability test for the glacial till on the spot and the indoor soil test for the glacial till sampling,acquired the permeability coefficients and the mechanical parameters characteristic values of the glacial tills in the studied area;3.Using the Sweden slice method,carried out the sensitivity analysis of the glacial till parameters for the stability coefficient of the landslide,through the sensitivity analysis,we can know that the sensitivity of the glacial till density is greater than the internal friction angle of the glacial till,and the effect of the cohesion change for the landslide stability is the smallest;4.Carried out the stability analysis for the typical glacial till landslide in this area through the Sweden slice method and the numerical simulation method,compared the differences and similarities of the two kinds of the analysis methods in the process of the stability analysis of the glacial till landslide;This paper carried the stability analysis of the glacial till landslide through the Sweden slice method and the numerical simulation method,researched the main controlling factor for the landslide instability of the glacial till,revealed the destroy mode and the development process of the glacial till landslide in the process of the earthquake and the rainfall,provided the basis for the prevention and control of the glacial till landslide in the region.