Analysis method for studying rock joint surface shearing damage process and test system

Abstract

The invention discloses an analysis method for studying the rock joint surface shearing damage process and a test system. The method comprises the following steps of using a mold taking material to rub and print the surface form of a natural rock joint surface; making a rock-like material test sample with the same surface form and mechanical parameter as natural rock by using a natural rock jointcurve surface mold; controlling different boundary conditions on the test samples to perform rock joint shearing tests, thus obtaining joint surface shearing macroscopic property parameter and featurevalues; in the shearing test process, using the sound emission to monitor the microcosmic evolution rule and energy features of the damage process of the surface of the joint surface, joint surface upper and lower rock block and anchoring structures; performing joint surface scanning by a three-dimensional laser scanning instrument before and after the shearing test, thus obtaining geometric evolution features of the joint surface damage; precisely expressing the damage property of the joint surface in the shearing process and the quantitative characterization thereof by combining the macroscopic property parameter and feature values of the joint surface shearing, the microcosmic evolution rule of the damage process, the energy features and the geometric evolution features.

Description

technical field [0001] The present disclosure generally relates to the field of underground engineering tests, and in particular relates to an analysis method and a test system for studying the shear failure process of rock joint surfaces. Background technique [0002] Entering the 21st century, my country's tunnel and underground engineering construction has entered an unprecedented period of prosperity, and more and more transportation, water conservancy and hydropower, mining and other projects are inevitably built in jointed rock mass areas. Engineering accidents such as sustained large deformation and large-volume landslides induced by shear failure of jointed rock often occur. Compared with the complete rock block, the joint surface has lower shear strength and is the weakest surface in the rock mass. Therefore, the mechanical properties of the rock mass largely depend on the shear mechanical properties of the joint surface. [0003] In actual engineering, many factor...

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Problems solved by technology

Laboratory tests are the most direct means to study the evolution of joint surface morphology and mechanical properties during the joint shear process. However, in the existing test devices and methods, it is impossible to perform high-precision repeated tests on rock specimens with natural joints. It is also impossible to continuously monitor and accurately obtain the internal deformation and failure laws and eigenvalues ​​of natural joint surfaces

In addition, the current research on the joint surface shear test is often a single aspect of the joint surface shear failure process, and there are few methods and techniques for comprehensive research on the joint surface shear failure process, which is not conducive to the study of the joint surface shear failure process. Systematic research on shear failure process of rock joints

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