Research On Stability Of Loess Landslides In Watershed Area Of Jinghe River And Weihe River In Linyou

As a special type of soil, loess is widely distributed in the Yellow River areas, With its unique nature, the loess geological hazards frequently occur in these areas, in which Gansu and shaanxi are the most serious. We found that Jinghe River and Weihe River watershed is one of the most serious areas in Linyou, shaanxi. In this paper, loess landslide of watershed area is regarded as studied object, and around the loess landslide controlling factors of instability and the instability mechanism the paper does the study of the stability of Loess landslides.First of all, based on the detailed analysis of the geological environment and the distribution of the researched objects, the loess landslides are divided into three types, such as: Loess-Paleosol Landslide, Loess-redbed landslide, Loess-bedrock landslide. Secondly, internal and external factors of landslide are explored thoroughly, and the conclusion is that rainfall is the main factor of loess landslide in watershed area. Thirdly, based on the physical and mechanical experiment of soil samples collected from field, the paper drives the relationship between shear strength parameters and moisture content of loess. Then, the paper studies the mechanism of the loess landslide. At last, based on the Mohr-Coulomb model in software FLAC3D, the paper does the Numerical analysis for Loess-bedrock landslides in western watershed area. Through the analysis of the safety factor in different conditions, we can conclude whether the Loess-bedrock landslides will recur. The result of stability analysis of the landslide has great significance for the residents who live on the Loess-bedrock landslides.