Study On Stability Of Landslide In Maigongshan Village And Soil Arching Effect Of Anti-slide Pile

The landslide in the Maigongshan Village,Tielou Town,Wen County,Gansu Province,not only seriously threatened the safety of the lives and property of the villagers in the village,but also easily blocked the road traffic of the village's external contacts.Therefore,the potential economic losses caused by the slide of the landslide are enormous.Based on the above,this paper takes the landslide as the research object.Through on-site investigation and mapping,exploration and information collation,the basic characteristics,as well as the evolution process and causes of the landslide are analyzed.And the stability of the landslide is systematically evaluated from both qualitative and quantitative aspects.Simultaneously,the MIDAS/GTS is used to construct a numerical calculation model of the landslide,analyze the changes about stress,plastic area and displacement of the landslide,and verify the stability of the landslide under three operating conditions,further simulate and analyze the change law of the internal stress strain of the landslide after the anti-slip pile engineering treatment.In addition,the relationship law between anti-slip pile design parameters(pile spacing,pile width)and soil arching effect is discussed by numerical simulation.The paper achieves the following main results:(1)Through on-site investigation and mapping,exploration,the basic characteristics,as well as the internal and external factors of landslide development about the landslide are analyzed.Simultaneously,the overall and partial safety stability of the landslide is analyzed qualitatively.(2)By means of the transfer coefficient method,the stability coefficient under the three operating conditions of the landslide is analyzed quantitatively.Simultaneously,the two-dimensional numerical calculation model of the landslide is constructed by MIDAS/GTS,based on the model,the numerical simulation results are consistent with the calculation results of the transfer coefficient method.(3)By using MIDAS/GTS software,simulating and calculating the landslide after treatment,its stability coefficient meets the stability safety factor requirements in the specification,the range of plastic area is obviously reduced,the displacement is significantly reduced,and the final simulation results show that the governance effect is good,and the engineering treatment of the anti-slip pile can meet the governance requirements.(4)With MIDAS/GTS,the engineering treatment model of anti-slip pile is constructed,and the relationship between anti-slip pile and soil arching effect is analyzed by changing pile spacing and pile width.Simultaneously,based on the stability coefficient results of numerical simulation,this paper discusses the relationship law between pile spacing,pile width and stability coefficient,futher proposes some suggestions for optimizing anti-slip pile parameters.(5)The research results not only provide important theoretical guidance for the engineering treatment of the landslide,and it is of great reference significance to the engineering treatment of other accumulation landslides with similar or identical conditions in the study area.