The Study Of Analytic Method For Slope Stability And Internal Forces Of Anti-sliding Piles

The rigid limited-equilibrium method has simple mechanical model. It can evaluate the slope stability by a fixed quantity. It is accepted widely by engineers, because it is tested by long-term engineering practice. So it is still used frequently to analyze the slope stability in the design of project, though there are a lot of irrational assumers in it. FEM takes the stress-strain property of rock and soil into account. The stress value and deformation value of every point inside the rock and soil can be figured out by it and there is no irrational assumers in it. It overcomes most of shortcomings of limited-equilibrium method.There is trial calculation question in the process calculating safety factor by transfer coefficient method. It can be resolved by iterative method. According to the example analysis, it is proved that the iterative method can advance the calculating efficiency evidently and its calculating speed can be influenced less by assumed original safety factor value.To unknown slip surface slope, ascertaining the location of the critical slip surface is the key problem in the process calculating the slope stability safety factor by traditional methods. The slope stability safety factor is calculated by strength reduction FEM. At the same time the new method ascertaining the location of the critical sliding surface of slope is presented in this paper according to the plastic zone graph at the time of land slide body sliding.As a efficient engineering measure of landslide treatment, anti-sliding pile is a very important measure in the measures of landslide treatment all over the world. On the basis of statistic,it is the mostly used engineering structure in landslide treatment to this day. Common internal forces analysis methods of anti-sliding pile take the landslide body and the anti-slide pile into account respectively, don't consider the deformation compatible and the stress compatible between landslide body and anti-slide pile. The interaction between landslide body and anti-slide pile is predigested to simple force action in these methods. In this paper a new internal forces analysis method of anti-slide piles is presented. It can take the landslide body and the anti-slide pile into account as a whole, and consider the interaction between the landslide body and the anti-slide pile efficiently and exactly.The normal water level of Zipingpu reservoir is 877 meters. After the reservoir sluices, the national highway 213 in this area will be submerged. So the national highway 213will increase its elevation to about 920 meters. In order to estimate the influence of the slope-sliding and bank-collapsing which caused by the reservoir sluices to the elevated highway, and to estimate possible emigration problem, Stability analysis of landslide bodyNo.l,2,and 3 in I , II area which located in bank accumulation body of Zipingpu reservoir in national highway 213 is made by transfer coefficient method and 2-D 3-D FEM in this paper.The collapsing scope of bank accumulation body of Zipingpu reservoir in national highway 213 which caused by the sharply falling of water level of Zipingpu reservoir is estimated according to the FEM plastic zone graph. To analyze FEM plastic zone graph not only can estimate the collapsing scope but also can prove that when the nether part of some landslide bodies collapse, the landslide bodies probably slide entirely.