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Study on Slope Stability Based on Synthetic Method

Author: XuJiWei
Tutor: XinQuanCai
School: Northwest University of Science and Technology
Course: Geotechnical Engineering
Keywords: slope stability limit equilibrium method FEM sensibility analysis
CLC: TU43
Type: Master's thesis
Year: 2010
Downloads: 139
Quote: 1
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Abstract

Slope stability is one of the three classic problems of soil mechanics, and the slope instability has become one of the three major global geological disaster. With conduction of economic construction and large-scale infrastructure of China, resulted in a large number of construction slope, water slope, mines slope, and transportation slope, etc. and so on. So it has great practical significance to do some study on slope stability.In this paper, the author discussed the FEM and limit equilibrium method. Then analyzed the sensitivity of slope stability factor’s inconsistencies with the method of orthogonal experiment and the method of improved gray association, according to the limit equilibrium method. At the same time, analyzed the feasibility of finite element double subtraction and the sensitivity of shear strength, the results show that the height of slope and initial strength selection have great effect on the sensitivity of the two shear strength parameters, and with the slope increasing, the sensibility of cohesion is rising, but the sensibility of internal friction angle is going down. This paper also discussed the feasibility of reduction with both cohesion and internal friction angle at different proportion, at this situation, the most dangerous circle has changed, and it is difficult to give a certain value as safety factor, so it needs to do much more research on it’s irrational.The author improved the gravity reduction FEM and proposed the synthetic method of gravity increase and strength reduction FEM. Applied different yield criterion and the stiffness and considered large deform effects, contrasted Von mises plastic strain and safety factor, which is calculated by strength reduction FEM and method of this paper, the results showed that two methods have similar results, it is said that the synthetic method of gravity increase and strength reduction FEM is feasible, indirectly illustrates the rationality of strength reduction FEM .It may appear large deformation when using large deformation with small stiffness ,so it can not get desirable results. In order to get a ideal results. It needs to increase the processing of the stiffness when using large deformation with synthetic method. When using small deformation and small stiffness the results of under 45°slope angle is consistent with the strength reduction FEM, the results has large deviation after 45°slope angle, but when using big stiffness all results consistent with strength reduction FEM. It can clearly be seen that the stiffness has obviously effect on calculation of safety factor when using small deformation after slope angle. The author also did some research about three dimensional slope by using the synthetic method, the results is coincident with strength reduction FEM, but the results is smaller when use small stiffness and small large deformation.

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