Analysis of elastic-plastic finite element for two dimension slope slip surface and stability

Through theoretical analysis and proof, potential slip surface theory is proposed to make sure of geotechincal potential slip surface in this paper. According to the stress analysis results of elasticplastic finite element method, the theory makes sure of geotechinical potential slip surfaces by means of numerical value integration.It is a universal method to make sure of geotechical potential slip surfaces. When geotechnical stress reaches failure condition, the potential slip surfaces determined by the method in this paper will become real slip surfaces. Through calculated analysis of many slope examples and engineering tests, potential slip surface theory in this paper is proved correct, and the analysis of slip stability and potential slip surfaces possess of much advantages. The shape, position and safety factor of slope stability for the most dangerous potential slip surface with the method in this paper is quite different from that with the normal methods. The results using the normal method are also different from reality. The change of the geotechnical deformation parameters has a great influence on the potential slip curves (surfaces), and has a little influence on the shape, position and average stability safety factor of the most dangerous potential slip curve (surface) . The change of soil unit weight has more influence on stability safety factor of slope than on the shape and position of the potential slip curves (surfaces). 