| The zhongzhai landslide is located in Zhongzhai formation,Niudaoping village,Shibing county,Guizhou province,about 5.0km away from Niudaichang town,shibing county.The overall form of the landslide is in the shape of an arm-chair.The landslide slipped in May 1972.Material composition mainly planting soil landslide,the diluvial gravel clay,strongly weathered shale,underlying bedrock for weathering of limestone,strata occurrence are 35°?10°,and landslide slope to relationship for oblique,landslide about 660m running,cross about 210 m wide,potential main sliding direction of 68°,the thickness of3.00-15.00m,average thickness of 8.00 m,main sliding direction about 8.00-15.00m thick,volume of about 150×104m~3,is a large middle earthiness landslides.According to the analysis of surface deformation characteristics,the landslide is in a basically stable state at present,but under the influence of extreme weather,especially heavy rainfall,the overall deformation and decline may occur in a short period of time.Once the disaster occurs,it will seriously threaten the lives and property safety of 283 villagers on the slope.This paper takes Zhongzhai landslide as the research object,carries out engineering geological mapping,drilling exploration,sample sampling,sample delivery,laboratory test,etc.,collects regional geological data,and comprehensively analyzes the deformation and failure characteristics of the landslide body by combining with the local meteorological and hydrological conditions,human engineering activities,seismic activities,etc.Then,the limit equilibrium method(polyline slip method)is used to calculate the landslide stability,and then the appropriate main slide profile is selected and geo-studio software is used for the numerical simulation analysis of the landslide,so as to comprehensively evaluate the stability of Zhongzhai landslide.Finally,on the basis of the comprehensive evaluation conclusion,combined with the relevant regional prevention and control experience and design norms,and then put forward a safe,economic,reasonable prevention and control program,in order to achieve the purpose of Zhongzhai landslide control.The following results were obtained:(1)By using the method of line slippage,it can be concluded that under the condition of heavy rain,the upper cultivated soil,the residual soil containing gravel clay and the strongly weathered shale are easy to slide along the boundary surface of the underlying moderately weathered limestone,while the underlying moderately weathered limestone will not slide.According to the results,the upper part of Zhongzhai landslide is mainly cultivated soil,broken stone clay,strongly weathered shale,and the lower part is mainly moderately weathered limestone.On this basis,the main slide section 2-2'was selected to simulate and calculate the variation law of the stability coefficient of Zhongzhai landslide under different rainfall conditions by using geo-studio software.The calculation results showed that with the increase of rainfall intensity,the stability of Zhongzhai landslide gradually decreased,and the decreasing range was larger and larger,and the time of deformation and sliding was faster and faster.This has a great impact on our selection of the prevention and control period.According to the rainfall in ShiBing county in recent years,we should choose the period of the treatment project from September to December to avoid the influence of rainfall on the landslide during the construction process,thus bringing safety risks to the villagers on the landslide.(2)On the basis of the qualitative and quantitative analysis and numerical simulation analysis and evaluation of Zhongzhai landslide,a safe,economical and reasonable prevention and control plan is put forward.The prevention and control plan is:"automatic monitoring+system drainage ditch+anti-slide pile". |
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