Stability Analysis Of Slope Based On Vector Method Safety Factor

The research of slope's stability is always a focus in the geotechnical engineering. Along with the aggrandizement of slope's amount and scale in engineering, enhancing the mechanism research of landslide has a great significance. This dissertation makes a summarization to the existing method of slope's stability analysis. Based on the vector method safety factor which was put forward by academician Ge Xiurun, this paper puts forward the method of slope's stability analysis includes establishing finite element model, stress interpolation and searching critical slip surface, and write the corresponding computational procedures"GAKV".The method in this paper has some critical parts. The slope's elastic-plastic model is established by using finite element software ANSYS and the nodes'stress can be calculated after meshing the slope's model properly. Regarding the slope's stress as regional variable, this paper uses spherical model constructs the theoretical variogram and applies the kriging interpolation method to interpolate the slide surface's stress. Through indraught the penalty function and strategy of retaining optimal chromosomes to improve the simple genetic algorithm, this dissertation constructs the fitness function related to the vector method safety factor and designs the arithmetic of circle-slide surface and noncircle-slide surface. In addition, how realize the above method by procedure is presented and the method of generating slide surface, restricting initial population rationally and fixing the scope of fitness function's variable are introduced detailedly.The two examples EX1(a) and EX1(c) come from ACADS are used to identify the method of slope's stability analysis put forward in this paper and show that its results is close to critical results and the error can be controlled in 4%. The stability of the dock in Fujian is caculated by this pqper's method, the safety factor of it is 1.2 that can fit the specification.The results show that: (1) the definition of vector safety factor is consice and has a clear physical meaning. Because vector safety factor based on slide surface's stress analysis, it can take full advantage of the finite element calculations to calculate reliable results; (2) calculating the vector safety factor only need to know the dot's stress on slide surface. If have already knew the slope's stress field, the combination of vector safety factor and genetic algorithm just have to control the variable which deside the location of slide surface, which greatly simplifies the initialization of chromosome and realization of genetic manipulation; (3)the search efficiency and reliability of genetic algorithm are improved after improving the simple genetic algorithm;(4) through the return validating and comparing the results of interpolation with other method, kriging interpolation method shows its reliability.