Stability Evaluation Of Huibeng Landslide In Zhongba Township Of Panzhihua

Huibeng landslide is located in Zhongba Township,Renhe District,Panzhihua City,Sichuan Province.The landslide happen in 1996.Because of the continuous rainstorm,the whole creep deformation of the slope was generated,and the steep slope with the maximum of 0.5m was formed at the rear edge.In the following years,creep deformation signs were found every year.At present,the maximum height of the rear edge of the landslide is about 1.0m staggered wall,and the ground has connectivity cracks,and the wall cracks appeared.And settlement,wall collapse phenomenon.During the rainy season of August 2015,slip occurred in the lower part of the landslide,and settlement and cracks occurred in the highway,which is about 20 cm.It is necessary to carry out detailed research.Based on the above problems,this paper studies Huibeng landslide in Renhe District,Panzhihua City,Sichuan Province.The contents are as follows:(1)The regional geological environment of the study area is systematically collected and sorted out.The basic geological conditions of the study area are expounded from the aspects of climatic characteristics,hydrological characteristics,stratigraphic lithology and geological structure,and the geological hazards in the area are statistically summarized.(2)Based on the engineering geological survey of Huibang landslide,the landslide characteristics,development trend and influencing factors are determined.According to the characteristics of Huibeng landslide in Renhe District,Panzhihua City,Sichuan Province,combined with field investigation data,geotechnical test data to determine the relevant parameters of simulation,inversion analysis,using the principle of limit equilibrium to analyze the stability of Panzhihua Huibeng landslide,complete the stability evaluation of the landslide.(3)Based on the geotechnical test data,the 1-1’main slip section is selected to establish the model,and the strength reduction method is used to analyze the stability of Huibang landslide in Zhongba Township,and the stability coefficient is compared with the limit equilibrium analysis.The results show that the calculation results of the limit equilibrium method and the strength reduction method are consistent and accurate.At the same time,in order to reflect the influence of the deformation zone,the models considering the deformation zone and not considering the deformation zone were established,and the simulation was completed by FLAC3 D.The results showed that the deformation zone had local subduction failure and formed cracks under rainstorm conditions.It was suggested that the drainage measures of the landslide body and the back of the deformation zone should be improved.