Stability Analysis Of Slopes In Strain Softening Behaviour

Most rock and soil materials exist strain softening phenomenon. If we ignore it when calculating, the stability of slopes can be overestimated. It may make slope dangerous. Therefore, limit equilibrium method and finite element strength reduction method considering strain softening are used to evaluate the stability of slope considering strain softening. And we use those methods to analyze the stability of H8 slope of Meng Dui Xiang area. The main research contents and results of this paper include following aspects:1.This paper introduces the calculation process and application range of common limit equilibrium method. And we use unbalanced thrust method and Spencer method to analyze the stability of slope of Pingxiang middle school. By comparing with results of those two methods, we can find that safety factor calculated by Spencer method is more reliable.2.This paper introduces limit equilibrium methods considering strain softening. They are Law method and Bishop method based on Swedish slice method. And we use those two methods to analyze the stability of H8 slope of Meng Dui Xiang area respectively. The calculation results show that safety factor obtained by these two methods is very close. Besides, by comparing with the calculation results of Sweden slice method and Bishop method without considering strain softening, we can find that the safety factor calculated by considering strain softening is smaller.3.The equivalent slope model of approximate real condition of H8 slope which considering strain softening are obtained by finite element methods of block technology and layered technology. And we use two methods analyze the stability of equivalent slope model. The calculation results show that safety factor based on finite element method of block technology is slight larger than finite element method of layered technology. In general, the difference is not larger. In addition, by comparing with the calculation results of limit equilibrium methods considering strain softening, we can find that the safety factor obtained by finite element strength reduction method is larger than limit equilibrium methods.4.By comparing with finite element simulation results of these three situations, we can find that safety factor of considering strain softening situation is always between the safety factor obtained from peak and residual value.5.The influence of related factors on stability of slope are discussed by some examples. Such as elastic modulus, Poisson ratio, shear dilation angle and mesh density.