Stability Analysis Of High And Steep Slope Of Q12-1 Block In Chongqing

With the continuous development of mountainous area construction,the influence of human activities on the slope stability is more and more great,especially the excavation stability of high and steep slope has attracted more and more attention.Commercial buildings are planned to be built on the high and steep slope of the Q12-1 block in Chongqing area,and the excavation of the high and steep slope is needed.Therefore,this project is chosen to analyze the excavation stability of the high and steep slope.In this paper,the transfer coefficient method and MIDAS numerical analysis method are used to analyze the stability of the high and steep original slope.The accuracy of the numerical simulation is judged by the results of the two calculation methods combined with the field investigation results,and then the stability of the high and steep slope after excavation is simulated numerically.The corresponding treatment measures are given by the simulation results.The results are as follows:(1)The stability coefficients of the original high and steep slope calculated by the transfer coefficient method in natural state and saturated state are 1.17 and 0.88,respectively.Midas calculated the stability of the original high and steep slope in the natural state and saturated state,and obtained the stability coefficient,displacement nephogram,stress and strain nephogram,and the stability coefficients were 1.30 and 1.03 respectively.The stability coefficients calculated by the two methods under the two working conditions are compared,and the accuracy of numerical simulation is judged by combining the actual survey results.(2)Through the calculation and analysis,it is concluded that the upper part of the slope is locally unstable.In addition,the proposed building No.18 is close to the slope.Considering the safety,it is necessary to cut the slope locally.The stability coefficient,displacement nephogram,stress and strain nephogram of the slope after slope cutting were obtained,and the stability coefficients under two working conditions were 1.55 and 1.50,respectively,meeting the stability requirements of the first level slope.The nephogram under two working conditions was compared and analyzed.(3)Numerical simulation was carried out on the slope excavation,the use of MIDAS after the high and steep slope excavation stability under natural state and heavy rain,after the excavation of the slope stability coefficient,the displacement nephogram,stress and strain contours,and under two conditions of stability coefficient is 1.45,1.25,respectively,after the excavation slope in the condition of heavy rain in the stable,In addition,the slope under the proposed building,the safety level is higher,need to reinforce its processing.(4)Determine the slope reinforcement system after excavation: Anti-slide pile,anchor cable and drainage,and use MIDAS to calculate the stability of the slope with reinforcement system,the stability coefficient,displacement,stress and strain cloud of the slope after reinforcement are given,and the stability coefficient is 1.55 and 1.45 respectively under the two working conditions,and the analysis of the slope after reinforcement is in a stable state under the two conditions.By comparing the stability coefficient,displacement,stress and strain changes before and after reinforcement,it is found that the slope stability is stronger and the displacement and strain are improved,which also proves the effectiveness of reinforcement measures.