Stability dynamic evaluation method for strain softening slope

Abstract

The invention discloses a stability dynamic evaluation method for a strain softening slope. The method comprises the following steps of (1) building a slope model and determining linear strain softening Mohr-Coulomb model parameters; (2) calculating an elastic initial stress field of the slope model and calculating an elastoplastic stress field of each unit of the slope model; (3) calculating a plastic shear strain value of each unit of the slope model; (4) calculating a shear strain increment of the slope model, and obtaining corresponding shear strength parameters of the slope model and a space-time distribution law of the shear strength parameters; (5) performing re-assignment on mechanical strength parameters of a rock-soil body of the slope, and analyzing a stability dynamic change process of the slope model; and (6) exporting a displacement distribution cloud chart, extracting coordinates, and performing fitting through a least square method in statistical analysis software, wherein a final fitting curve reflects a potential slip surface of the to-be-analyzed slope. According to the method, a dynamic change situation of a stability coefficient and the potential slip surface of the slope in a slope failure process can be obtained.

Description

technical field [0001] The invention relates to the technical field of geological engineering, in particular to a dynamic evaluation method for the stability of a strain softening slope. Background technique [0002] All kinds of natural and artificial slopes are widely distributed in our country, and frequent slope geological disasters have caused huge losses to society and economic property. Therefore, the scientific and reasonable evaluation of slope stability has important scientific and practical significance. The quantitative analysis of slope stability mainly includes limit equilibrium method and numerical simulation method, among which numerical simulation method has been widely used because of its convenience and accuracy. [0003] Most of the rock and soil mass has the characteristics of strain softening, and the strength parameters of the rock and soil mass may be weakened or even strengthened to varying degrees during the softening stage. However, there are stil...

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Problems solved by technology

[0003] Most of the rock and soil mass has the characteristics of strain softening, and the strength parameters of the rock and soil mass may be weakened or even strengthened to varying degrees during the softening stage. However, there are still few studies considering the change mode of the post-peak strength parameters of the rock and soil mass in the study of progressive failure of slopes.

In addition, the existing numerical simulation studies mostly use methods such as strength reduction method or limit equilibrium method to determine the safety factor of slopes at different stages, but the strength parameters of strain softening materials may play different roles in the softening stage, and there is a lower limit of residual strength ( or upper limit), the strength reduction method obviously contradicts this, and the limit equilibrium method often requires cumbersome model, parameter and even software conversion

Therefore, the current analysis of progressive failure of strain softening slopes still has certain limitations.

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