Study On The Stability Analysis And Evaluation Of High Rock Slopes

The methods usually used to evaluate the stability of high rock slopes are not able to identify the exact position of critical failure surfaces caused by slopes destruction. In this paper, FEM strength reduction method, proposed by Zheng Yingren, are applied to search critical failure surface, so that it can helps to solve the design and work problem caused by the inexact position of the critical failure surface.Because rock blocks are divided into fracture items by crossing texture surfaces, the deformation and destruction of them are controlled by texture surfaces. As the most disadvantageous factor for the stability of slopes can only be the two pairs of external and parallel joints, the exact position of critical failure surface can be searched. This is the law of texture surface destruction of high rock slopes, which is also called the law of critical failure surface formation.In this paper, firstly, several kinds of laws of texture surface destruction are analyzed theoretically. Then, nonlinear FEM strength reduction method is used to calculate several different kinds of texture surface in the circumstance of ANSYS. Comparing the result of theoretical analysis with the above result, it is found that the earliest combined plastic area is distributed on the texture surface of rock blocks. The distribution regulation of strains in the plastic area is same to the texture surface destruction regulation. On the base of calculation of the rock high slope in Baolongyu testing area, it is tested and verified that using FEM strength reduction method to search critical failure surfaces of rock high slopes is feasible and practical.