Analysis of slope slip surface by three-dimension finite element method

A new method in which the threedimension slope slip surface and stability can be analyzed by the potential slip surface theory is presented in this paper. According to the stress analysis results of elasticplastic finite element method,the method makes sure of potential slip surfaces,the most dangerous potential slip surfaces and stability safety factor of slope by means of numerical value integral, and the method has tight theoretical basis. Through analysis of many threedimension slope engineering examples, it shows that the slope stability safety factor and the most dangerous slip surface using the twodimension method are quite different from that using threedimension method, and the threedimension slope should be analyzed by the threedimension method.