Method for quantitatively depicting progressive failure mechanical parameters of rock mass

Abstract

The invention discloses a method for quantitatively depicting progressive failure mechanical parameters of a rock mass. The method comprises the following steps: carrying out unequal-amplitude cyclic loading and unloading under multistage confining pressure, and representing the loading process of different damaged rock masses in each cycle, obtaining the deformation modulus and peak strength of different damaged rock masses, and obtaining a changing curve of the deformation modulus and the strength along with progressive damage to realize quantitative depiction of the deformation modulus; and further analyzing the strength curve, extracting corresponding sample strength under different confining pressures and different damages to draw a Moire circle, taking a common tangent line of the Moire circle as a strength envelope line, obtaining multiple groups of strength parameters according to the multiple groups of strength envelope lines, and obtaining a strength parameter change curve of the rock mass under different damage conditions in progressive damage to realize the quantitative depiction of the strength parameter. The method disclosed by the invention is quick, accurate, simple, high 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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