Stability Analysis And Treatment Scheme Optimization Of Wangjiagou Landslide In Baota District Of Yan'an

With the development of China's economy and the implementation of the strategy of developing the western region,infrastructure construction and urbanization have been accelerating.In the course of construction,the landslide geological hazards are increasing.Due to the large number of landslides,the causes are complicated,the frequency is high and the damage degree is large,which often leads to traffic disruption,casualties and destruction of buildings.Therefore,it is very important to scientifically evaluate landslide stability and choose the optimal control scheme for landslide prevention and control.In this paper,the geologic environment condition and landslide characteristics of the landslide are analyzed in the Wangjiagou landslide of Yan'an.The stability evaluation and the control scheme are optimized.The specific content is divided into the following aspects:(1)The geological and environmental conditions of the Wangjiagou landslide in Yan'an are analyzed,and the characteristics,structural characteristics and deformation and failure characteristics of the landslide are studied.It is considered that the lithology,rainfall and human engineering activities are the main influencing factors of deformation and failure.(2)Qualitative and quantitative analysis of landslide stability.Qualitative and quantitative analysis that the overall stability of the landslide,local instability,under the conditions of rainfall in the overall sliding possibilities.The stability coefficient of landslide is 1.17,the landslide is in steady state under the natural condition,and the stability coefficient is 1.00 in the rainstorm condition.In an unstable state,in extreme conditions may occur instability damage.(3)The finite element strength reduction method was used to simulate the landslide using Midas software.The simulation results were in good agreement with the above analysis.(4)According to the characteristics of landslide and stability analysis,three treatment schemes are designed for the landslide.The fuzzy comprehensive evaluation method is used to optimize the three kinds of governance schemes,and the optimal scheme is obtained as follows: engineering and anti-slide pile + slope protection project + drainage engineering + greening project.