An X-ray transmission test device and method for simulating in-situ fracture of rocks

Abstract

The invention discloses a device and a method for an X ray transmittable test for simulating in situ crushing of rocks. The device comprises a main loading mechanism, a pressure head driving mechanism, a rock-crushing working surface slurry pressure simulation mechanism and a sample crushing test mechanism; the main loading mechanism is composed of a base, an axial pressing piston, a PEEK pressure-bearing drum, a blind flange and a cushion column; a pressure head loading rod is penetrated through the cushion column and the blind flange and is used for driving a pressure head to act on an end face of a rock sample and to insert into the sample for crushing. Axial pressure and confining pressure are loaded to a test design value; in situ three-directional stress state of rock in rock mass engineering is simulated; an unloading working surface of the rock mass engineering is simulated by the end face of the sample in an area in the middle of the cushion column; liquid can be injected to achamber on the upper part of the area, so as to simulate the slurry pressure of the working surface of the rock mass engineering. The pressure-bearing drum is prepared from X ray transmittable PEEK engineering plastics. Combined with an opening type CT scanning instrument, the device is capable of monitoring the microcosmic crack initiation, extension and converging process in the rock in real time, for analyzing the development mechanism of rock crushing cracks.

Description

technical field [0001] The invention relates to an X-ray transmission test device and method for simulating in-situ crushing of rocks, which simulates the crushing of rocks under the three-dimensional stress environment where the in-situ rocks are located at the working face of rock mass engineering, and belongs to the crushing mechanics of rocks field. Background technique [0002] There have been a lot of work on rock fracture research at home and abroad, and a systematic cognition has been formed on the rock fracture development process and fracture mechanism. The rock intrusion and crushing test is an important experimental research method to reveal its mechanism, but the relevant rock intrusion and crushing tests have always had two defects: First, the intrusion and crushing of the sample cannot simulate the three-dimensional stress state of the original rock , often only consider the lateral stress, and can not simulate the mud pressure of the working face; second, wh...

AI Technical Summary

Problems solved by technology

The rock intrusion and crushing test is an important experimental research method to reveal its mechanism, but the relevant rock intrusion and crushing tests have always had two defects: First, the intrusion and crushing of the sample cannot simulate the three-dimensional stress state of the original rock , often only consider the lateral stress, and can not simulate the mud pressure of the working face; second, when performing CT scanning on the development process of the broken crack of the sample, it cannot be scanned under the load condition, and it often needs to be unloaded and then scanned. , the state of the rift will change

[0003] In view of the above-mentioned defects of the rock sample intrusion fracture test, the three-dimensional stress environment has a great influence on the crack development of the sample, and the CT scan of the sample after unloading will also affect the closing state of the crack. , how to effectively simulate the rock breaking process at the working face in rock mass engineering, it must be considered to simulate the three-dimensional stress environment and the CT scan under the condition of no unloading

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