True triaxial real-time scanning CT testing device and method for high-pressure hard rock fracture process

Abstract

A true three-axis real-time scanning CT test device and method for high-pressure hard rock fracture process, the device includes a rigid frame and a beam, a beam lifting guide column and a driving oil cylinder, an upper and lower loading base, a rotary drive platform for the upper and lower bases, and a high-energy accelerator CT ray source Together with the detection source, four actuators, and two actuators on the upper and lower loading bases, the four actuators are distributed at an inclination of 45° as a whole. It is located between the CT ray source and the detection source, and the pressure chamber can rotate 360° horizontally. The method is as follows: prepare a sample assembly, scan the vacant pressure chamber with CT equipment, and provide reference data for subsequent image processing; place the sample assembly in the pressure chamber, and control the rigid beam to descend until the pressure chamber is closed; centering and clamping The sample assembly, the pressure chamber is rotated, and the three-dimensional image of the sample is obtained by the CT device; the true triaxial stress is applied, the pressure chamber is rotated, and the three-dimensional image of the sample under each stress condition is obtained by the CT device.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics, and in particular relates to a true triaxial real-time scanning CT testing device and method in the high-pressure hard rock fracture process. Background technique [0002] With the continuous development of social and economic construction, there are more and more deep rock mass projects, and the deep rock mass has the characteristics of "three highs and one disturbance", that is, the deep rock mass is in a complex geological environment with high ground stress, high ground temperature and high osmotic pressure. When the deep rock mass is disturbed by engineering excavation, the initial stress state changes, and the local stress concentration causes the deformation and rupture of the rock mass. Therefore, describing the change characteristics of the three-dimensional structure inside the rock mass under the true triaxial stress state and clarifying the deformation and fracture mechanism un...

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Problems solved by technology

[0004] The high-energy accelerator CT rock mechanics test system developed in recent years, although it meets the loading and scanning requirements of rocks under uniaxial compression and conventional triaxial compression conditions, it still cannot meet the requirements of deep rock mass rupture under true triaxial stress loading conditions. Real-time scanning requirements for the whole process

[0005] For the fracture test research of deep rock mass under true triaxial stress state, scholars have developed different types of true triaxial loading testing machines, including rigid loading testing machines, flexible loading testing machines and rigid-flexible mixing testing machines. In particular, the full stress-strain type hard rock true triaxial test system developed in the past two years adopts a mixed mode of two rigid loading boundaries and one flexible loading boundary for loading, and can obtain standard-sized hard rock samples under true triaxial stress conditions. However, it cannot meet the requirement of direct observation of the whole fracture process of deep brittle hard rock under static loading conditions.

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