A method to quantitatively describe the mechanical parameters of progressive failure of rock mass

Abstract

The invention discloses a method for quantitatively describing the progressive failure mechanical parameters of rock mass. Through cyclic loading and unloading with different amplitudes under multi-stage confining pressure, each cycle represents the loading process of different damaged rock masses, and different damaged rock masses can be obtained. The deformation modulus and peak strength of the body can be obtained, so as to obtain the change curve of the deformation modulus and strength with the progressive failure, and realize the quantitative description of the deformation modulus; further analyze the strength curve, and extract the corresponding test results under different confining pressures and different damages. Draw the Mohr circle for the sample strength, and take the common tangent of the Mohr circle as the strength envelope. According to multiple sets of strength envelopes, multiple sets of strength parameters are obtained, and the strength parameter change curve of the rock mass under different damage conditions in the progressive failure is obtained. Therefore, the quantitative description of the intensity parameters is realized, and the method of the present invention is fast, accurate, simple, strong in applicability, and easy to popularize.

Description

technical field [0001] The invention belongs to the field of rock mechanics and engineering geology, in particular to a method for quantitatively describing the mechanical parameters of rock mass progressive failure. Background technique [0002] The deformation and strength of rock mass are the basic properties of rock mass and the core content in the research of rock mass mechanics and engineering geology. The deformation strength of rock is usually obtained by experiment, and the stress-strain curve is obtained based on uniaxial, conventional triaxial or shear, and the peak strength on the stress-strain curve is taken as the strength of the rock mass (Ulusay, 2014). However, due to the heterogeneity of the rock mass, the failure of the rock mass is not achieved overnight, but a gradual process of internal crack initiation, expansion, penetration, and finally overall destruction (Brace, 1966; Bieniawski, 1967; Martin, 1997), during which the deformation and strength chara...

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Problems solved by technology

Therefore, it is obviously impossible to characterize the mechanical behavior characteristics of the entire progressive failure process of the rock mass only by the peak strength, and there is still no method to obtain the deformation strength parameters in the progressive failure process of the rock mass, and the quantitative change law of the deformation strength parameters in the progressive failure process of the rock mass is still unknown. is the unresolved key difficulty

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