Sensitivity Analysis Of Factors Affecting The Stability Of High Fill Slope

The western regions of China are mostly mountainous and hilly landforms.Infrastructure construction in these areas often results in a large number of high-fill slopes.For high fill slopes,there are usually buildings,roads,airports and so on at the top of the slope.Once the slope is unstable and damaged,it will seriously affect people's production and life.Therefore,it is necessary to study the stability of high fill slope to ensure the long-term stability of high fill slope.There are many factors that affect the stability of high fill slopes.Through sensitivity analysis of these factors,the importance of these factors can be understood.On this basis,relevant measures can be better taken to provide the stability of high fill slopes.Firstly,this paper briefly introduces the slope stability factors,calculation methods of slope stability,and the sensitivity research methods of stability factors.Then,based on the three sensitivity research methods of gray correlation analysis,vector similarit y method and orthogonal test design,the sensitivity of high fill slope stability factors is studied.The main research contents and results are as follows:(1)In order to study the influence of physical and mechanical parameters of fill,slope geometry and seismic action on the stability of high fill slope,the sensitivity analysis of parameters was carried out by grey correlation analysis method.However,the traditional gray correlation analysis model does not take into account the different weights of various factors.Therefore,in this study,the vector similarity method is used to weight the influencing factors to improve the traditional gray correlation analysis model.The results show that the improved gray correlation analysis method is more realistic in evaluating the sensitivity of stability factors.The unloading platform width,cohesion,and internal friction angle of the fill area are the most important factors affecting the stability of high fill multi-level slopes.(2)This paper introduces two commonly used multi-factor comprehensive index evaluation methods: Euclidean distance and cosine similarity.These two methods are used to analyze the sensitivity of the factors affecting the stability of high fill slope,such as the physical and mechanical parameters of the fill,the geometric shape of the slope,seismic action,etc.The feasibility of Euclidean distance and cosine similarity to calculate the sensitivity of high fill slope stability factors and the rationality of the calculation results are verified by comparing with the calculation results of grey correlation analysis.The results show that internal friction angle,unloading platform width and cohesion are the most important factors affecting the stability of high fill slope.Euclidean distance similarity and cosine similarity can be used to evaluate the sensitivity of slope stability.(3)This paper introduces the frame anchor plate,a new supporting structure for fill slope,and takes the parameters of frame beam,tie rod and anchor pl ate as the research objects of parameter sensitivity.The orthogonal test design method was used to arrange the tests,and the sensitivity of these parameters to slope stability was studied by range analysis and variance analysis.The results show that the sensitivity ranking results obtained by range analysis and variance analysis are consistent.The section length of the frame beam and the length of the anchor plate have the most significant effect on the stability of the high fill slope.