Multi-field coupling monitoring and testing device for coal rock

Abstract

The invention discloses a multi-field coupling monitoring and testing device for coal rock and belongs to the technical field of mining. The multi-field coupling monitoring and testing device comprises a base, a testing cavity body, an axial-pressure applying system, a confining-pressure applying system, a pore flowing-pressure simulation system, a temperature applying system, a charge acquisitionsystem, an acoustic emission signal acquisition system, a strain acquisition system and a data acquisition and analysis device, wherein the testing cavity body comprises a steel pressure-resistant cavity and a sealing flange disc, a transmission rod is arranged at the middle part of the sealing flange disc, and an upper pressing head and a lower pressing head are arranged in a sealed space formedby the steel pressure-resistant cavity and the sealing flange disc; the pore flowing-pressure simulation system comprises a first pore flow-pressure port formed in the upper pressing head, a second pore flow-pressure port formed in the lower pressing head, a first flowing-pressure transmission hole and a second flowing-pressure transmission hole formed in the sealing flange disc, a flow meter anda flowing-pressure applying system; the temperature applying system comprises an electric-control heating belt wound on the surface of a thermoplastic sleeve; and the axial-pressure applying system comprises an axial hydraulic cylinder and a pressure sensor.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a coal-rock multi-field coupling monitoring test device. Background technique [0002] The long-term mechanical behavior of coal and rock is an important research direction in the field of rock mechanics, and it is also a hot issue in engineering. In recent years, the coal industry has officially entered the stage of deep mining. The deep coal rock mass is not only affected by high geostress, but also coupled with high osmotic pressure and high geothermal temperature. Therefore, mining engineering activities have changed the stability of the original rock stress. Therefore, it is extremely important to study the long-term mechanical behavior of coal and rock mass under the coupling effect of high ground stress-high seepage pressure-high ground temperature, which is conducive to a more scientific understanding of deep high stress, The catastrophe breeding mechanism of coal and roc...

AI Technical Summary

Problems solved by technology

[0003] At present, there are relatively few test devices for the triaxial mechanical behavior of coal and rock mass, especially the test devices that can carry out long-term strength tests of coal mass with the two influencing factors of pore flow pressure and temperature at the same time. The mechanism of rock burst inoculation requires not only theoretical research, but also corresponding experimental research. Therefore, it is necessary to develop a method that can obtain the mechanical behavior of coal and rock mass under the coupling effects of stress field, seepage field and temperature field. It is very necessary to realize the test device that can monitor the physical signal generated during the rupture process

Images