Stability Analysis And Research Of Fenghuangling Mountain Landslide In Pingle County,Guilin

In recent years,due to the rapid economic development in China,human engineering activities have become more and more frequent,which has a great impact on the environment,and the occurrence of geological disasters such as landslides has shown a rising trend,which has a significant impact on the social and economic development and the safety of people’s lives and properties,so the research and prevention of landslides are of great social significance and economic value.This paper takes the landslide of Fenghuangling Mountain in Pingle County,Guilin City,Guangxi as the research object,describes the characteristics of the landslide through site investigation and data analysis,analyzes the main causes of its instability;evaluates its stability by using Rizheng Geotechnical 6.5 and GEO5 calculation software;studies the potential slip crack surface and rupture angle on the basis of numerical calculation of landslide stability,and proposes a reasonable management plan.The main research results are as follows.(1)Through site investigation and data analysis,it was found that after successive extra large and heavy rainstorms,pulling cracks and subsidence appeared on the top of the slope,causing great harm to the buildings on the top and lower part of the mountain,and the landslide of Phoenix Ridge was considered as a small shallow stripping and traction landslide;the heavy rainstorms,loose geotechnical properties and strong human activities were the main causes of the landslide of Phoenix Ridge.(2)The stability of the Phoenix Ridge landslide was evaluated using Rizheng Geotechnical 6.5and GEO5 calculation software,and it was found that the Phoenix Ridge landslide is basically stable under natural conditions,but it is in an unstable to unstable state under heavy rainfall conditions,with a high probability of producing a whole or block landslide.(3)Based on the numerical calculation results,the position and morphological characteristics of the landslide surface are analyzed,and it is found that the setting of the retaining wall at the bottom of the slope effectively prevents the movement of the landslide body.The trend of landslide body movement is weakened;the rupture angle and the stability coefficient are polynomial correlations under natural conditions and heavy rain conditions,and the correlation is high;the rupture angle and sliding force under natural and heavy rain conditions are polynomials Correlation,high degree of fit.(4)Based on the stability evaluation of landslide under multiple conditions and the analysis of slip crack surface,we proposed a landslide prevention and control plan for the Phoenix Ridge mountain,using the traditional protective measures of retaining wall and prestressed anchor rod,combined with the new technology of polymer grouting reinforcement.The increase of safety coefficient under natural condition is 37.29%,and the displacement is 15.87% lower than that before reinforcement;the increase of safety coefficient under storm condition is 41.28%,and the displacement is 16.02% lower than that before reinforcement,and the safety coefficient meets the design requirements and achieves the purpose of landslide management.