Slope progressive failure latent slide surface calculating method

Abstract

The invention provides a slope progressive failure latent slide surface calculating method-simplified as failure angle rotating method; aiming at the existing disadvantages, assuming geology material failure to satisfy a condition in which an angle between the maximum shear stress surface and the minimum principal stress axis is matched with a critical stress state; because the principal stress direction rotates in different positions when different external load and gravity load are applied on the slope, searching calculation of the slope latent slide surface is carried out, thus determining the latent slide surface, and defining failure rate and failure ratio concepts. The failure angle rotating method ensures that the fail point stress state is at the critical stress state in the slope failure process; in the failure process, the fail path changes along the stress changes; the failure rate and failure ratio concepts are employed, and a failure path constitutive relation considers softening characteristics under different normal stress effects, so the slope latent slide surface can be resolved on the value calculating base.

Description

technical field [0001] The present invention relates to technical fields such as the prevention, evaluation and forecasting of civil engineering and geological disasters, foundation pits, etc., and particularly relates to the stability analysis, evaluation, prediction and forecasting of geological disasters, foundation pits, and the formulation of prevention and control measures. The present invention realizes the The potential sliding surface determination and stability evaluation of the gradual failure process of geological disasters and foundation pits have a huge role in promoting the prevention and prediction of slopes and foundation pits. Background technique [0002] The stability evaluation of slopes is based on the assumption of the limit equilibrium state. The widely used methods are: Swedish method, simplified Bishop method, Janbu method, transfer coefficient method, Sarma method, wedge method, Fellenius method, finite element method, etc. There are more than a do...

AI Technical Summary

Problems solved by technology

The determination of its potential sliding surface is also based on the theory of the critical stress state. However, the site slope failure is gradual. The sliding surface is partly in the critical stress state, and partly in the post-failure or pre-peak stress state area. The current limit equilibrium state It is difficult for the potential sliding surface obtained by the method to be consistent with the actual site. In view of this, the present invention proposes a calculation method for the potential sliding surface of slope progressive failure—hereinafter referred to as the failure angle rotation method. This method makes the determination of the potential sliding surface to Actual site pushes a big step forward

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