Stability Evaluation And Treatment Scheme Optimization Of Tawa No.1 Landside

In recent years,with the rapid economic growth,our country invested a great deal of time and energy to public infrastructure construction,therefore obtained the rapid development of transportation industry,especially highways and railways.Especially in the process of highway construction,geological disasters often accompany it,especially represented by landslides.Nowadays,the country advocates ecological restoration,and some landslides and slopes need effective treatment to restore the ecological environment.This article takes the Tawa No.1 landslide as an example,collects the geological environment conditions of the area where the landslide is located,describes the landslide morphology and rock-soil characteristics through field investigation,and analyzes the landslide formation mechanism.The landslide stability analysis adopts qualitative analysis method and quantitative analysis method,proposes treatment schemes based on the analysis results and optimizes them.The research content of the thesis is as follows:(1)Investigate the basic geological conditions and related geological background of the area where the Tahua No.1 landslide is located.Combined with field drilling and indoor rock and soil physical and mechanical tests,the morphology and structural characteristics,types and material composition of the landslide are analyzed.(2)Determine the typical cross-section characteristics and rock-soil parameters of the landslide,and use the transfer coefficient method to analyze the stability of the landslide under various working conditions before and after the excavation of the roadbed.(3)Using Midas GTS / NX to numerically simulate the stress,strain,displacement and stability of the Ⅱ-Ⅱ ’section after excavation,analyze the stress,strain and displacement clouds under different working conditions,and describe the law of change and failure.The distribution law of stress-strain and displacement cloud diagrams under different working conditions are generally similar.Under abnormal working conditionsⅠand Ⅱ,the stress,strain value and displacement will increase to different degrees,and the maximum shear strain rate will appear first At the foot of the excavation slope,the range will gradually expand towards the rear,eventually connecting the entire sliding surface,causing the slope body to slide along the sliding belt.And from the displacement cloud diagram,it can be seen that after the roadbed is excavated,the deformation rate of the landslide starts at the foot of the slope,and then the rear slope body is deformed after pulling,and there is a tendency to slide down.(4)According to the characteristics of the landslides and the proposed projects in each section and the stability analysis of each section of the landslide,combined with their corresponding engineering geological conditions,three different engineering prevention schemes are designed.Pole + drainage engineering + slope protection + slope foot protection,scheme two is cutting slope grading + anti-slide pile + anchor frame + anchor cable frame + drainage engineering + slope protection + slope foot protection,scheme three is cutting square laying Slope + anchor cable + anchor rod + drainage works + slope protection + slope foot protection.(5)AHP-Fuzzy comprehensive analysis method is used to optimize three different governance schemes,the factors affecting the governance scheme are clearly defined,the hierarchical comprehensive evaluation index system structure is determined,and the weight of each factor is determined by the hierarchical analysis method.Combining the system structure and the fuzzy comprehensive evaluation method to determine the evaluation system of the landslide treatment plan,evaluating the three treatment plans,and finally determining the second plan(cutting landslide + anti-slide pile + anchor frame + anchor frame + drainage project + Slope protection + slope foot protection)is the best solution.