Open-pit Coal Mine Layered Soft Rock Slope Stability And Reinforcement Plan Analysis

Slope stability has always been a hot topic in the field of geotechnical engineering.However,there are many factors that can cause slope instability,and cases of slope instability induced by rainfall are common.Therefore,conducting research on the slope stability and reinforcement schemes under rainfall conditions for the current slope of the Zanihe open-pit coal mine is of great significance for ensuring the safety of mining production.This article adopts a combination of theoretical analysis and numerical simulation methods to conduct research on the current slope of the Zanihe open-pit coal mine.It reveals the variation law of the seepage field of the slope in the study area under the action of rainfall,proposes a formula for calculating the critical rainfall intensity when the slope fails,and provides a reference for slope monitoring and safe production in the mine.On the basis of ensuring the stability of the slope,the angle of the anchor reinforcement is optimized to provide a theoretical basis and technical support for the prevention and control of the slope in the Zanihe open-pit coal mine.The main research content and achievements are as follows:The principles of slope stability calculation are clarified in this study.The limit equilibrium method and finite element method software(Geo-studio,Slide,Plaxis)are used to calculate the stability coefficients of a specific slope under the effects of rainfall and dewatering.The results show that the stability coefficients calculated by the limit equilibrium method are generally 1.2% to 10% higher than those obtained by the finite element method.The accuracy of the slope model and the selection of physical and mechanical parameters of rock and soil will affect the comparative results.Based on previous landslide inversion analysis,the Geo-studio software is recommended and the Morgenstan-Price method is used to calculate the stability coefficient,which is more in line with the actual conditions of the Zanihe open-pit mine.Reveal the evolutionary law of slope stability over time under rainfall conditions.Based on unsaturated soil mechanics and seepage theory,the stability of drained and fully saturated slopes under rainfall conditions was analyzed.The results showed that when the rainfall intensity reached 100mm/d,the stability coefficient began to decrease sharply;after one day of rainfall,regardless of whether the slope was completely drained or not,the stability coefficient decreased by 21.42%～42.16%;after 25 days of rainfall,the stability coefficient tended to stabilize.Therefore,it is recommended that mines carry out flood prevention and drainage operations during the rainy season.A study was conducted on the reinforcement effect of slopes under different working conditions to determine the optimal parameters for anchoring.To obtain the best anchoring effect,the thesis simulated the reinforcement effects of slopes with horizontal angles of 5 degrees,10 degrees,15 degrees,20 degrees,25 degrees,30 degrees,35 degrees,40 degrees,and 45 degrees,respectively.The results showed that the position and angle of the anchor cable would affect the reinforcement effect of the slope,and the stability coefficient of the slope reached the optimum value when the angle of the anchor cable construction was chosen as 15 degrees.This thesis has 95 figures,29 tables and 254 references.