Study On Evaluation Model Of Xiegeda Slope Stability Based On Matter Element Theory

The Xigeda stratum is a semi-diagenetic stratum with extremely poor engineering properties.This stratum is mainly distributed in southwest China,with a distribution area of 40,000 square kilometers.The Xigeda stratigraphic distribution area is an area rich in energy and resources in China,and it has a large number of important industrial and defense facilities such as Xichang Aerospace City,Pangang,Ertan.In the early days,due to the unclear understanding of its nature,during the construction process or after completion,a large number of geological disasters such as landslides in the Xigeda stratum caused great losses to people's lives and property.Currently,the Xigeda stratum distribution area is still being developed for large-scale engineering construction,it is necessary to study the slope stability of Xigeda stratum.Because Xigeda stratigraphic distribution areas are mostly economically underdeveloped areas,a large amount of infrastructure is urgently needed to improve the living standards of local residents.However,the mechanical properties of the rock and soil in the Xigeda stratum are special.Slope stability evaluation should be carried out in order to formulate targeted prevention and control measures during the survey and design stage to ensure the engineering quality,construction safety,and schedule of construction projects,reduce engineering costs,and threaten people's lives.Therefore,it is of great engineering practice significance to establish an evaluation method that can quickly and accurately judge the slope stability at the site or line selection.At the stage of site selection or line selection,due to the constraints of the site environment,equipment and facilities and the technical level of the staff,it is often not possible to solve the engineering geological problems that may occur on the site at any time by using high-precision numerical simulation methods to obtain highly reliable calculation results;In engineering projects such as emergency rescue and on-site disaster relief,on-site engineering personnel often need quick and easy technical means to effectively evaluate the danger of geological disasters in the operating area in order to save project construction time,reduce engineering safety risks,and reduce people's lives and property losses.Therefore,it is necessary to propose a rapid evaluation method of landslide risk that is suitable for engineering practice.The main research contents and main conclusions of this paper are as follows:1.Determination of influencing factors of slope stability in Xigeda stratumIn order to establish the risk model of slope instability,the evaluation index,that is,the influencing factors of slope stability,must first be determined.In this paper,a combination of field investigation and indoor geotechnical test is used to determine the influencing factors of slope stability in Xigeda stratum.Specifically,it took three typical Xigeda stratum landslides in Shimian County,Ya'an City as the research object,conducted field investigations,and collected clay and silt soil samples from the Xigeda Formation at Mojiagang Landslide and Shawan Bay Landslide.In the soil test,the physical and mechanical properties of the clay and silt soil of the Xigeda Formation were measured respectively.2.Establish an evaluation model for slope instability of Xigeda stratum based on matter-element theoryBased on the determination of the influencing factors of the slope stability of Xigeda stratum,this paper classifies the danger of each factor and numerically processes the results of the grading;using the method of combining analytic hierarchy process and entropy weight method The combined weights of factors affecting the slope stability of Xigeda stratum were obtained.Based on the matter-element analysis method and the combination of the evaluation index combined weight calculation results,an evaluation model for slope instability of Xigeda strata was established in this paper.3.Verification of the accuracy of the evaluation model based on numerical simulation methodsThis article aims to establish a rapid slope stability evaluation model that is suitable for the early site survey and construction phase of the project.In order to ensure that the model has high accuracy based on the simple and fast access to quantitative evaluation results of qualitative indicators,this article The finite difference method is used to analyze the stability of typical engineering cases.On the one hand,the analysis results are used to verify the accuracy of the analysis model established in this article.On the other hand,the model evaluation results are compared with the stability coefficient calculation results to establish the correspondence between the two parts.