Rock property test system and rock damage evolution test method

Abstract

The invention discloses a rock property test system, which comprises a rock microscopic optical tester. A fully saturated sample is placed on the rock microscopic optical tester, and the surface of the fully saturated sample is provided with an acoustic emission test system and a resistivity test system. Specifically, a rock damage evolution test method includes the steps of: 1. connecting the rock microscopic optical tester with the acoustic emission test system and the resistivity test system in parallel; 2. assembling a rock property test system; 3. performing uniaxial compression test and observing the correlation of the rock's wave electric field parameters and strain under a loaded condition; 4. quantitatively describing the appearance and internal injury of the rock at each loading stage under a load-bearing condition; and 5. at each stage of uniaxial compression damage evolution, employing different damage variables to describe the rock damage evolution process. The system and the method provided by the invention can realize whole course observation of the whole process of the rock internal and external damage rupture, and overcomes the restriction of traditional testers on the sample shape.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics and geology, and in particular relates to a rock characteristic testing system and a rock damage evolution testing method thereof. Background technique [0002] Engineering rocks often contain a large number of tiny cracks and micro-cavities. At the same time, the loss and fracture process of rocks under load is often a process of microscopic damage expansion and evolution, and macroscopically shows a staged stress-strain curve. The development of research on the damage evolution mechanism of rock-like solid materials is extremely slow. First, there is a lack of reliable mesoscopic damage quantification methods. Second, the complexity of the internal structure of rock-like materials and the discreteness of macroscopic mechanical behavior. [0003] The development of rock microscopic optical testing machine has effectively promoted the quantitative research of mesoscopic damage. Through the ...

AI Technical Summary

Problems solved by technology

The development of research on the damage evolution mechanism of rock-like solid materials is extremely slow. First, there is a lack of reliable mesoscopic damage quantification methods. Second, the complexity of the internal structure of rock-like materials and the discreteness of macroscopic mechanical behavior

[0003] The development of rock micro-optical testing machine has effectively promoted the quantitative study of mesoscopic damage. Through the quantitative description of the apparent damage evolution of the rock during the loading process, the relationship between the apparent damage amount and the macroscopic mechanical properties has been discussed. However, such methods It can only observe the damage evolution process of the rock surface, but cannot reflect the internal fracture mechanism

At the same time, with the development of rock-like materials, transparent rock materials with high brittleness are more and more widely used in damage evolution. Traditional rock optical testing machines have higher requirements on the geometry of transparent rock materials, that is, samples should not be made into Conventional three-axis cylindrical sample, because the cylindrical transparent sample is not conducive to the observation of the telephoto camera

Even the introduction of CT technology is limited in its applicability due to its high research cost

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