Research On Landslide Development Characteristics And Control Scheme Of Auto-repair And Auto-parts City In Nanjiang County

The research object of this paper is the landslide of automobile repair automobile parts city,which is located in the vicinity of the Broken Channel Park in Nanjiang County,Sichuan Province.During the excavation and construction of the first phase project of automobile repair automobile parts city,the front edge of the slope collapsed,the middle and rear cracked,and the whole sliding easily occurred under the adverse factors such as heavy rainfall.The development characteristics,failure modes and stability of the landslide are analyzed,and reasonable control countermeasures are put forward,which is of great significance for the prevention and control of landslide disasters in Nanjiang Mountains.By means of Engineering survey,engineering geological mapping,drilling,sampling and laboratory test,the geological conditions,material structure characteristics and deformation and failure characteristics of landslide are identified,and the physical and mechanical parameters of rock and soil required for the calculation and evaluation of landslide stability and the design of control engineering are obtained.The stability coefficients of automobile repair and automobile parts City landslide under natural,rainstorm and earthquake conditions are calculated and evaluated by means of folded sliding surface transfer coefficient method,Geoslope and FLAC3 D software.Based on the geological conditions of landslide,the characteristics of protection objects and the applicable conditions of various retaining structures,a reasonable control scheme is put forward.The specific summary is as follows:1.The landslide of Nanjiang Auto-repair and Auto-Parts City presents a "ring-chair" shape on the plane.The main direction of the landslide is 171 degrees,the length is 158-163 m,the lateral width is 88-130 m,the thickness of the slide body is 3.2-8.5 m,the plane area is about 16,900 m2,and the sliding volume is about 110,000 m3.It belongs to medium-sized shallow soil engineering landslide.2.Landslide body of Qixiu Auto Parts City in Nanjiang County is silty clay with block stones,sliding surface(zone)is soil-rock contact surface,which is divided into traction landslide from mechanical mechanism.Its failure mechanism is creep-pull fracture,and it is in creep stage during exploration.Thicker loose deposits,empty front excavation and no retaining works are the main causes of landslides.3.The stability of landslide is controlled by the shear strength of sliding surface(zone).The results of the three analysis methods show that the landslide body is basically stable under natural conditions,unstable under rainstorm conditions and unstable under earthquake conditions.4.According to the actual situation of the landslide,two treatment schemes are put forward: anti-slide pile retaining + cut-off drainage and cut-off load reducing + anti-slide pile retaining + cut-off drainage.In general,the layout of the project is to set up anti-slide pile sheet wall support on the empty face of excavation at the front of the landslide,to set up ditches at the back edge of the landslide to intercept the slope surface flow,and to cut the side and reduce the load on the middle and rear edge of the landslide.