Method for judging instability of rock masses of dam abutment of arch dam with structural plane

Abstract

The invention discloses a method for judging instability of rock masses of dam abutment of an arch dam with a structural plane, which comprises the steps of establishing a stress and strain relationship of a structural plane to obtain a shear force-shear displacement relationship of a fault zone; constructing a sharp point mutation model of rock mass instability; monitoring displacement generatedby the structural surface, and when the instability condition is met, giving an alarm out. In this way, the abrupt change model of the structural surface rock mass instability is constructed; the rockmass instability judgment basis is given, the cusp mutation theory is adopted to solve the problem of actual rock mass discontinuity, the method no longer takes the rock mass as a continuous whole, the influence of the properties of surrounding rock and cracks on rock mass stability is considered, the method is more reasonable, an alarm is given once the structural surface is about to be unstable, and measures can be taken in time conveniently.

Description

technical field [0001] The invention relates to the technical field of hydraulic structure engineering, in particular to a method for judging the instability of an abutment rock mass of an arch dam with structural surfaces. Background technique [0002] An arch dam is a water retaining dam built in a canyon. It is made into a horizontal arch, with the convex side facing upstream, and the two ends are close to the canyon wall. It is a curvilinear water retaining dam that can transmit part of the horizontal load to both banks. architecture. During the operation of the arch dam, it is necessary to pay close attention to the stability of the arch dam. Most of the arch dam accidents in the past were caused by instability or excessive deformation of the abutment rock mass, and few were caused by the stress of the arch dam itself. Therefore, the stability of the arch dam is mainly reflected in the stability of the abutments on both banks, and the stability analysis of the arch da...

AI Technical Summary

Problems solved by technology

At present, there are three main types of analysis methods for rock mass stability at the dam abutment: (1) the rigid body limit equilibrium method that considers rock mass as a rigid body, and the results of this method are relatively rough; (2) the dam and foundation as elastic or elastic-plastic bodies. The finite element method unifies the stress, deformation and stability for analysis, but when considering the three-dimensional model, the amount of calculation is very large; (3) using the model test method, the geomechanics model is the only natural one that can simulate the discontinuous rock mass quite comprehensively. conditions and rock mechanical properties, the process and mechanism of the abutment from loading to failure can be understood through experiments

However, the experimental method is labor-intensive and expensive

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