Stability Evaluation And Treatment Of Hegou Landslide In Wuqi County,Yan'an City

In order to actively respond to the requirements of natural disaster prevention and control in China in the new era,and effectively improve the ability of geological disaster prevention and control,the evaluation of the stability of landslides in the loess area has important guiding significance for the prevention and treatment of landslides and other disasters in the loess area.This paper takes the Hegou landslide in Wuqi County,Yan'an as the research object,and evaluates the stability of the Hegou landslide through laboratory tests,numerical simulation and theoretical calculations,and finally chooses the treatment plan.The main research work is as follows:(1)Based on the engineering geological conditions of the landslide,clarify the factors affecting the stability of Hegou landslide and qualitatively evaluate the stability of Hegou landslide.Through indoor physical and mechanical tests,the mechanical indexes of the sliding body,sliding surface and sliding bed soil are analyzed.According to the limit equilibrium theory,the overall stability of the Hegou landslide and the local stability of the trailing edge of the slope body are analyzed.(2)Based on the strength reduction theory,the 3D calculation model of the Hegou landslide is established by FLAC 3D software.The stress,strain and displacement of the landslide are simulated under two working conditions,and the conclusion is drawn that the landslide is basically stable under natural conditions and understable under rainfall conditions.(3)Apply fuzzy comprehensive evaluation method to optimize the treatment plan of Hegou landslide,and propose the treatment plan and construction technology of Hegou landslide,and finally adopt the "brush side load reduction+backfill back pressure+gravel blind ditch drainage+greening project" scheme for protection and protection.