Dynamic and static combined loading rock fracture characterization test device and method matched with industrial CT machine

Abstract

The invention provides a dynamic and static combined loading rock fracture characterization test device and method matched with an industrial CT machine, and belongs to the technical field of geotechnical mechanics. The test device comprises an axial pressure system, a confining pressure system, a rotating system and a scanning system; the axial pressure system realizes axial dynamic and static combined stress disturbance loading on a sample, the confining pressure system applies confining pressure to the sample, the rotating system drives the testing machine to rotate through a turntable, andthe scanning system obtains an absorption coefficient of a scanned object through a series of scanning at different angles and performs three-dimensional imaging. According to the invention, the industrial CT scanning technology is utilized, the mesoscopic damage and dynamic fracture evolution process of the rock under dynamic and static combined stress disturbance is observed in real time, and the fracture evolution process of the rock is visually and digitally characterized. The pressure chamber is made of carbon fibers made of special materials and has the advantages of being high in strength and small in density, the ray energy attenuation condition when X-rays penetrate through the pressure chamber is improved under the condition that the function requirement is met, and the triaxialcylinder wall of the pressure chamber bears loading counter-acting force.

Description

Technical field [0001] The invention relates to the technical field of rock and soil mechanics, in particular to an industrial CT machine supporting dynamic and static combined loading rock fracture characterization test device and method. Background technique [0002] With the decrease of shallow mineral resources, more and more metal mines tend to develop deeper. Deep hard rock mines not only have high in-situ stress and high energy storage, but also because of the large buried depth, in order to ensure the mining strength, multiple middle sections and multiple mine rooms are usually operated at the same time. The underground mine rooms are layered and various types of mining, mining and blasting The operation is continuous. In the deep stope, with the collapse of large amounts of explosives, thick ore bodies are mined, leaving high-stress surrounding rocks and large void areas. As the original rock balance is broken, stress transfer, crack propagation, and instability failur...

AI Technical Summary

Problems solved by technology

[0003] The macroscopic deformation and failure mechanism of rocks under stress can be obtained through triaxial tests, but triaxial tests can only obtain the failure state of rock samples after the test, and cannot observe the rock fracture evolution process in real time

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