Large simulation test acoustic emission device for multi field coupling coal mine dynamic disaster

Abstract

The invention discloses a large simulation test acoustic emission device for a multi field coupling coal mine dynamic disaster, and the device comprises a test piece box body, wherein the box body is provided with a probe mounting hole; a plug is welded at one end, which is near the inner cavity of the box body, of the probe mounting hole; one end, which is far away from the box body, of the probe mounting hole is provided with a first bolt in a matching manner; the outer side of the plug is provided with an acoustic source probe; a spring is subjected to press fitting between the acoustic source probe and the end surface of the first bolt; the first bolt is provided with a first axial through hole; a second bolt is arranged in the first axial through hole in a matching manner; the second bolt is provided with a second axial through hole; and a circumscribed lead of the acoustic source probe is led out from the first axial through hole and the second axial through hole. According to the large simulation test acoustic emission device, the time-spatial revolution rule of the acoustic emission signal of the coal-rock mass before and after the coal mine dynamic disaster happens can be monitored so as to achieve the purposes of researching internal relation among a stress field, a seepage field, a temperature field and a fracture field and the mutually-coupling action mechanism in the coal mine dynamic disaster process.

Description

technical field [0001] The invention relates to an acoustic emission device for simulating a coal mine dynamic disaster process test under a multi-field coupling mechanism. Background technique [0002] Coal mine dynamic disasters are coal and rock masses with a large amount of elastic energy accumulated in a high-stress state in the process of coal mine mining. Under certain conditions, the coal and rock mass suddenly breaks, falls or is thrown, causing the energy to be released suddenly, presenting sound, vibration and gas. Extremely complex dynamic phenomena with obvious dynamic effects such as waves, which mainly have three main forms: coal and gas outburst, rock burst and large-scale roof fall, which seriously threaten the safe production of coal mines and the safety of miners' lives. The occurrence of dynamic disasters is difficult to predict and grasp, and its internal pathways and mechanisms have not been fully understood by human beings. Moreover, with the increasin...

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Problems solved by technology

[0003] In the prior art, the test devices for simulating coal mine dynamic disasters mainly have the following problems: (1) The size of the model used is small, and the development process of simulating dynamic disasters has a certain space limitation; (2) The degree of automation of device installation is low ; (3) The sealing of the device is not high, the simulated gas pressure is not high, and the pressure of the test simulated gas cannot be close to the site situation; (4) The opening speed of the protrusion baffle is slow or there is a certain delay, which affects to a certain extent The time and intensity of coal and gas outburst are not known, so there are still differences between the actual simulation situation and the real underground coal and gas outburst; (5) The simulated in-situ stress cannot completely simulate the local stress concentration of the mining face caused by mining activities; (6) The coal body parameters inside the prominent mold are not collected enough. In most cases, only the temperature and gas pressure are collected, and the collection point is relatively single. It is impossible to analyze and study the stress and temperature development law inside the coal body before and after the coal mine dynamic disaster.

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