Research On Rapid Evaluation Method For Highway Slope Stability In Mountain Area

With the development of China’s highway engineering to the west,the problem of slope stability brought by the construction of mountain highways has become increasingly prominent.The geological conditions in mountainous areas are complex,the initial period of survey and design is short,and the number of slopes is large.Traditional quantitative evaluation methods for slope stability are difficult to meet the needs of project progress.It is of practical engineering significance to establish a set of rapid evaluation methods suitable for slope stability of mountain highways in the early stage of survey and design.This article takes the G07₁₁ Urumqi-Yuli section highway survey and design contract WYSJ-1 as the background,and aims at the problem of rapid evaluation method of mountain road slope stability,modified TSMR method and fuzzy mathematical theory are used.To systematically study the engineering geological conditions,slope structure types,deformation failure modes,and factors affecting slope stability of slopes under investigation,establish a rapid evaluation index system and fuzzy comprehensive evaluation model for slope stability in mountain highways.And quickly evaluate the stability of the slope along the line.The main research contents and results of this article are as follows:（1）Research on slope engineering geological model and deformation failure mode.In order to quickly describe the structural characteristics of slope rock and soil mass,slopes were classified according to engineering geological properties,rock mass structure types and deformation failure modes,and various types of slopes were established based on engineering geological survey data and slope structure types in the study area.The engineering geological model of various types of slopes analyzes and summarizes several major deformation and failure modes of various types of slopes.（2）Establish a rapid evaluation index system for mountain highway slope stability.In view of the complex geological environment of mountain highways and the influencing factors,the frequency statistical method is used to select high-representative and representative factors from the relevant literature on rock slope stability analysis as the main factors affecting rock slope stability factors;the finite element method is used to analyze the influence of cohesion,internal friction angle,gravity,slope height,slope,rainfall intensity,rainfall time and permeability coefficient on the stability of soil slopes,and gray correlation analysis is applied on this basis The method ranks the importance of factors affecting the stability of soil slopes.Based on the selected factors,a rapid evaluation index system for the stability of mountain highway slopes was established.（3）Research on rapid evaluation method and model of mountain highway slope stability.In order to quickly evaluate the stability of mountain highway slopes at high altitude,high altitude and high earthquake intensity,based on the TSMR method,considering the effect of earthquake action on slope stability,and introducing the TSMR system in the form of correction coefficients,a TSMR method is proposed to evaluate the stability of rock slopes on mountain highways.;on the basis of studying the sensitivity of each influencing factor,the weight of each evaluation index was determined using the AHP method,and the expert evaluation method and membership function were used to determine each evaluation The degree of membership of the index established a rapid evaluation model of soil slope stability.（4）Practical application of the project.Taking the slope of the contract section of the Urumuchi-Yuli Expressway as the background,based on the field engineering geological survey data,the rock structure of the slope along the line is quickly described.According to the established rapid evaluation method and model for the slope stability of mountain highways,quickly evaluate the stability of the slope in the study area,and provide technical support for the safe and efficient construction of Urumuchi-Yuli Expressway.