Multi-field coupling large-sized simulation test system for coal mine dynamic disaster

Abstract

The invention discloses a multi-field coupling large-sized simulation test system for coal mine dynamic disaster, which comprises a framework and test piece boxes. An X-direction pressure plate, a Y-direction pressure plate and a Z-direction pressure plate are arranged on each test piece box, a protruded opening is disposed on a front box plate of each of box bodies, a ventilating steel plate and an air passage are arranged at the bottom of each box body, sensor interfaces are arranged on each box body, the framework consists of a base, a left upright column and a right upright column are fixed onto the base, a crossbeam is fixed to the upper ends of the left upright column and the right upright column, the test boxes are placed on the base, pressurizing cylinders are disposed on the framework, the quantity and the positions of the pressurizing cylinders correspond to those of Y-direction pressure bars and Z-direction pressure bars, second cushion plates corresponding to second cushion plates are disposed on the left upright column, an additional seat is fixedly connected to the rear end of the base, X-direction pressurizing cylinders are arranged on the additional seat, the quantity and the positions of the X-direction pressurizing cylinders correspond to those of X-direction pressure bars, a counter-force frame is fixedly connected to the front of the base, and a left sliding door and a right sliding door are disposed on the counter-force frame. By the aid of the multi-field coupling large-sized simulation test system, a coal mine dynamic disaster process can be accurately simulated, and a coal mine dynamic disaster causing mechanism can be scientifically researched.

Description

technical field [0001] The invention relates to a test system for simulating the coal mine dynamic disaster process under the multi-field coupling mechanism. Background technique [0002] Coal mine dynamic disaster is the coal or rock mass with a large amount of elastic energy accumulated in a high-stress state in the process of coal mining, which suddenly breaks, falls or is thrown under certain conditions, causing the energy to be released suddenly, presenting sound, vibration and Extremely complex dynamic phenomena with obvious dynamic effects such as air 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 increasing depth of coal mine mining, the frequen...

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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 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 fully simulate the local stress concentration of the mining face caused by mining activities; (6) The coal and rock mass parameters inside the outburst 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 laws inside the coal and rock mass before and after the coal mine dynamic disaster.

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