Method for analyzing stability of crack-containing bentonite slope reinforced by pre-stressed anchor cable

Abstract

The invention discloses a method for analyzing the stability of a crack-containing bentonite slope reinforced by a pre-stressed anchor cable, and provides a rotation-translation combined mechanism to evaluate the stability of the crack-containing bentonite slope, a translation mechanism is adopted to simulate a crack sliding surface, and a rotation mechanism is adopted to simulate an arc sliding surface. Aiming at the characteristic that the unit weight of bentonite is in nonlinear change along the depth of a soil layer, a sliding soil body is dispersed into a series of soil units, the power made by the gravity of the bentonite is calculated by adopting a layered summation method and a rotational volume integration method, and the total power made by the gravity is obtained by accumulation. And obtaining a bentonite slope safety coefficient expression according to a volume weight increase principle, and searching a slope minimum safety coefficient based on an enumeration method to obtain a corresponding critical sliding surface. According to the method, the bentonite strength theory and the limit analysis method can be effectively combined, the slope suction effect and the anchor cable action mechanism are reasonably explained, and the method has important academic value and practical significance for guiding slope design, construction and reinforcement.

Description

technical field [0001] The invention relates to a method for analyzing the stability of a slope, in particular to a method for analyzing the stability of a bentonite slope reinforced by prestressed anchor cables. Background technique [0002] At present, the research on the stability analysis of engineering slopes is mainly based on the plane strain problem, and the consideration of the suction effect is not enough. The research methods mainly focus on the limit equilibrium method and the finite element method. Especially in the research on the stability and reinforcement mechanism of fractured bentonite slopes. [0003] The bottleneck problems in the research of slope stability analysis include: the research method does not fully consider the slope suction effect, the research methods mainly focus on the limit equilibrium method and the finite element method, and the research on the limit analysis method is relatively small. The main difficulties in studying the stability ...

AI Technical Summary

Problems solved by technology

[0002] At present, the research on the stability analysis of engineering slopes is mainly carried out based on the plane strain problem, and the consideration of the suction effect is not enough. The research methods mainly focus on the research of the limit equilibrium method and the finite element method. Few, especially in the study of the stability and reinforcement mechanism of bentonite slopes with cracks

[0003] Bottleneck problems in the study of slope stability analysis include: the research methods do not fully consider the slope suction effect, the research methods mainly focus on the limit equilibrium method and the finite element method, and there are relatively few studies on the limit analysis method

The main difficulties in the study of the limit analysis method for the stability of bentonite slopes with cracks are: first, it is difficult to construct the stress field permitted by static force and the velocity field permitted by motion in heterogeneous materials; Slope Energy Balance Equation to Seek Upper and Lower Limit Solutions

[0004] In addition, the existing soil slope stability analysis does not focus on the reinforcement of cracked bentonite slopes with prestressed anchor cables, and the sliding surface simulation during the analysis process is not accurate enough, resulting in inaccurate final analysis results

Images