Large simulation test piece box for multi field coupling coal mine dynamic disaster

Abstract

The invention discloses a large simulation test piece box for a multi field coupling coal mine dynamic disaster, and the large simulation test piece box comprises a box body, wherein the box body is provided with X-directional, Y-directional and Z-directional platens; the front box plate of the box body is provided with an extruded hole; the bottom of the box body is provided with a ventilating steel plate and an air flue; the ventilating steel plate covers the air flue; the inlet of the air flue is provided with an inner plug; the exterior of the left box plate of the box body is fixedly connected with first base plates at intervals; the left box plate is provided with sensor interfaces in the interval between the first base plates; and the sensor interface is provided with a sensor joint. According to the large simulation test piece box, the coal-rock mass gas pressure, the ground stress and the temperature variation as well as 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 so as to more deeply disclose the generation mechanism of the coal mine dynamic disaster, and a theoretical basis is provided for the coal mine dynamic disaster prevention and treatment.

Description

technical field [0001] The invention relates to a test piece box for simulating the coal mine dynamic disaster process under the mechanism of multi-field coupling. 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 rock 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 increasing de...

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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 simulated gas in the test cannot be close to the situation on site; (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, rock and gas outburst are not known, so there are still differences between the actual simulated situation and the real underground coal, rock and gas outburst; (5) The simulated in-situ stress cannot fully simulate the local stress concentration of the mining face caused by mining activities; ( 6) The collection of coal and rock mass parameters inside the outburst mold is insufficient. 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 internal stress and temperature development law of the coal rock mass before and after the coal mine dynamic disaster

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