The Study Of The Formation Mechanism And Stability Of The Tian Zi Dian Landslide In Fu Ling Region’s National Highway319

As bedding landslide disaster is always instant, pestilent and difficult governance, it is reasonable and economic to treat the landslide, though exactly judging the formation mechanism of the bedding landslide and the deformation evolution.Therefore, the formation mechanism of the landslide stability analysis and research has important theoretical value and realistic meaning and social significance.The Tian Zi Dian landslide in Fu Lin region, its front elevation is located in246.00-256.00m and its elevation plateauedge is located in357.00-362.00m. The landslide is along the319national highway, whose lenth is about390m, east and west width180m,area7.02x104m2, slippery body average thickness18m,and the volume126.4x104m3. The main slip with the direction of the landslide about84°is in accordance with the rock direction. The landslide is a middle layer and large bedding rocky landslide. Landslide directly caused more than1054yuan economic losses. In this paper, through a lot of ground geology survey and drilling engineering method, analyzing the formation of landslide and inducing factors, and applying the traditional method of landslide stability analysis, the formation mechanism of the landslide is found out, and proposing the feasible of landslide control measures. The research results not only to the area along the layer of landslide prevention and management to provide the basis, but also to the southwest landslide hazard similar points of disaster prevention and reduction work has a certain significance. The main new understanding and the obtained results are as follows:(1) Landslide area as single-side mountain terrain, has big difference in elevation. In this area, precipitation is plentiful and the infiltration of rainwater and pond water provide sufficient conditions to soften the clay with mudstone and. Highway in the consequent slope toe was excavated and form cutting, the height of its free face up to8 -10m, providing free conditions for slope deformation and making final deforming toward surface slope along the layer sliding. This is a typical Sliping-tension cracking landslide. According to different landslide deformation, the landslide will be divided into two area south and north landslide. The formation of the landslide had experienced three main stages:northern peristalsis deformation, the basic stable stage of south, north deformation accelerating, southern peristalsis deformation stage,and the whole landslide sliding stage.(2) Through the limit equilibrium method computation, slippery body in natural conditions is in basic stability to steady state and working in heavy rains, sliding body in north is in instability to understable state and southern slippery body is in understable to basic stable state. When the northern area in front of the original highway is excavated, sliding body in rear edge will be silding.(3) The effect of the landslide stability sensitive factor analysis shows that the landslide stability coefficient and slide is a inverse linear with weight degree and a directly linear with C, φ value,and φ value is the most sensitive.(4) According to the rest of the landslide down force size and deformation characteristics, proposing that landslide should first after sliding body margin of cutting, retaining structures shoud be set in front of slide, strengthening the cuting surface water drainage measures.