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| Middle scale simulation system of coal and gas outburst |
| NIE Baisheng1，2，3，MA Yankun1，2，3，MENG Junqing1，2，3，HU Shoutao4 |
| (1. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology(Beijing)，Beijing 100083，China；2. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources，China University of Mining and Technology(Beijing)，Beijing 100083，China；3. School of Resource and Safety Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；4. Beijing Academy of Safety Engineering and Technology，Beijing 102617，China) |
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Abstract The similar simulation experiment of coal and gas outburst can reveal the developing mechanism of outburst hazard. The development of an outburst simulating apparatus in middle scale is shown in this paper. The apparatus should adapt to experiments with specific mining environment and operations of presetting experimental conditions is simple and flexible. The outbursts occurred in a certain geological circumstance，such as gas rich area or regional tectonics，can be simulated with the experimental system. The apparatus is composed of a test chamber，a distributed load system，an outburst-inducing device，a vacuum pumping and gas charging system，and a data acquisition system. A geological model with the dimensions of 1 500 mm×600 mm×1 000 mm，containing coal seam，roof and floor and tectonic structure，can be moulded flexibly. The distributed loading on the top face of model simulates the abutment stress in working face. The sieve tube with the diameter of 5 mm is embedded in the coal sample for gas charging. Charging with the graded pressure makes sure that the coal sample reaches the adsorption equilibrium rapidly. A rupture disc installed on the outburst port is used as the outburst-inducing device，and it is destroyed immediately if the gas pressure is over the threshold value. A transparent window on the test chamber shows the fracture process of coal and rock. Data acquisition system collects the most of physical parameters，such as the pressure，temperature and stress. The high-speed photographing captures the movement of outburst coal. An artificial outburst was conducted with absorption equilibrium pressure of 0.30 MPa and inducing pressure of 0.53 MPa. The gas pressure and temperature in the coal sample showed the fluctuating variations because of the adsorption-desorption process during experiment. The duration of the outburst was 1.92 s and 369.9 kg of specimens was expelled from the outburst port. The expelled materials appeared as the fan-shaped distributions and the propagation distance reached 41.4 m.
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2018, Vol. 37 
