The Stability And Treatment Engineering Optimization Of Beishan Landslide In Hanji Town

Linxia County is located in the transition zone of the Loess Plateau and the Qinghai-Tibet Plateau in the west,the terrain is high in the southwest and low in the northeast,and the position in the structure is the outside of the west wing of the arc-shaped fold belt of the Luhelan Mountain construction system,which is complicated by the interference between different tectonics.In recent years,as climate change and human engineering activities have intensified,many large and even giant landslides have shown signs of resurrecting,threatening infrastructure and the safety of public life and property.Based on the key scientific issues of landslide prevention and mitigation and disaster prevention,the paper takes the north mountain landslide in Hanji Town,Linxia County,as an example,and studied the geological features,induced factors,disaster types and instability patterns of the landslide through detailed geological hazard investigation at the scene;The mechanism of landslide mechanics was discussed,and the development characteristics and stability of ancient landslides in Beishan,Hanji Town,were studied by numerical simulation methods,and proposed three different governance schemes.On this basis,with the goal of selecting the optimal governance scheme,the OAWEA operator optimization model was selected for the three schemes,and get the following results:(1)Research found that the North Mountain Landslide H in Hanji Town was a medium-sized earth slide formed by the partial resurrection of the ancient landslide HG,and the sliding surface was located on the perturbation mud rock surface,By studying the geological background and geological deformation characteristics of the landslide in The North Mountain in Hanji Town,the main cause of the landslide was continuous heavy rainfall,and the landslide destruction mode was slip-pull.(2)The qualitative and quantitative analysis of the stability of the north mountain landslide in Hanji Town is carried out by the method of limit equilibrium and the finite element strength reduction method,and the results show that the landslide is in an unstable state in its natural state.(3)The results of Midas-GTS show that the lower slope safety factor is 1.008 in the self-weight condition,the maximum displacement appears on the front edge of the landslide,and the backward edge decreases gradually,the maximum shear strain is not continuous,the slope is in an unstable state,and the self-weighting is in a state of self-weighting.The lower slope safety system of rainstorm condition is 0.922,the displacement distribution law is basically consistent with the self-weight state,but the maximum shear and strain belt is through,the landslide is in an unstable state.(4)Combined with the resuscitation characteristics of the ancient landslide in The North Mountain in Hanji Town and the stability of the landslide,and proposed three different treatment schemes,(1)the slope cutting,gravity wall,anchor frame,and drainage,(2)the retaining wall and anchor rope structure beam,slurry stone protection slope,drainage,(3)the anti-slip pile and protective wall and cut-drainage scheme.Through the analysis and selection of three aspects of reliability,economy and feasibility of three different governance schemes,the optimal governance scheme is selected by the OAWEA operator optimization model.