| China ’s topography and geological conditions are very complex,mountainous areas account for about 2 / 3 of the land.With the rapid development of the domestic economy,the urban population is increasing,and landslide disasters are also common.When the landslide occurs,a large amount of rock and soil mixture pours down from the mountain,which is extremely destructive and causes extremely huge loss of life and property.Therefore,it is of great significance to analyze the stability of landslide and put forward the prevention and control measures according to the results of stability analysis.This paper takes the Kunpeng copper landslide in Lixi Town,Huili County,Sichuan Province as the research object.Through the field investigation and indoor test of the landslide in this area,the internal and external influencing factors and deformation mechanism of the landslide in this area are summarized.Geostudio software was used to calculate and analyze the stability of the landslide under different natural,rainfall and seismic conditions.Then,using the numerical simulation software FLAC3 D,numerical simulation was carried out to better understand the characteristics of the landslide.By comparing the conclusions with the limit equilibrium method,the two methods were verified.Through the analysis and research on the failure form and failure range of the landslide,the stability analysis is carried out,and the corresponding protective measures are put forward.The main research results are as follows:(1)According to the geological survey and indoor experimental data,the research and analysis show that the landslide type is a middle-level push-type landslide.The main factors affecting the landslide are improper rainfall and improper discharge of production and domestic water in the plant area.The landslide is still in a basically stable state,but under the interference of external factors such as rainfall and earthquake,the landslide of Kunpeng Copper Industry may become unstable or even unstable.(2)Using Geostudio software to analyze the stability of Kunpeng Copper Landslide,the safety factor of the landslide under natural conditions is 1.114,indicating that its stability is good.However,in the case of heavy rainfall and a strong earthquake of magnitude 7,the safety factor of the landslide is reduced to 0.928 and 0.935,respectively,indicating that the landslide of Kunpeng Copper Industry will be unstable under the influence of heavy rain and earthquake.(3)Using FLAC3 D software,the numerical simulation of Kunpeng copper landslide is carried out.The stress change,displacement change and stability coefficient change of the landslide under natural state,rainstorm and earthquake state are analyzed in detail.According to the simulation results,it is concluded that under natural conditions,the maximum deformation of the Kunpeng copper landslide occurs near the leading edge of the landslide,and there is a local stress concentration point.There is a shear stress concentration on the interface between the plain fill soil layer and the lower bedrock,but it is not enough to make the slope slide in a large area,and the landslide is basically stable.Under the condition of heavy rainfall and earthquake,the interface between the upper plain filling soil layer and the lower bedrock of the landslide is loosened.The upper plain filling soil layer of the landslide has a large displacement as a whole,and the landslide is in an unstable state at this time.(4)Based on the field investigation of Kunpeng copper landslide,combined with the numerical simulation results,the corresponding prevention and control suggestions are given.The scheme of ’ intercepting drainage ditch + crack filling + pile retaining + deformation monitoring ’ can be used to comprehensively control the landslide. |
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