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| New progress in physical simulation experiment of coal and gas outburst |
| YUAN Liang1,2, XUE Yang1, WANG Hanpeng1*, MA Zhengwei1, YU Guofeng3, KANG Jianhong4, REN Bo2,3
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1. School of Qilu Transportation, Shandong University, Jinan 250061, Shandong, China;
2. Key SKL of Deep Coal Mine Excavation Response &
Disaster Prevention and Control, Anhui University of Science and Technology, Huainan 232001, Anhui, China;
3. Coal Mining National Engineering Technology Research Institute, Huainan Mining Group Corporation, Huainan 232001, Anhui, China;
4.School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China |
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Abstract In order to further study the mechanism of coal and gas outburst and solve the safety problem of coal mining, the research group had made new progress in similar system and physical simulation experiment.Based on the energy model of coal and gas outburst and the classical gas-solid coupling model, the similarity criterion of coal and gas outburst was established, and the similar materials of high absorption gas bearing coal, ultra-low permeability rock and intrinsically safe gas were developed to ensure the scientificity and accuracy of the physical simulation experiment; six sets of basic test instruments, such as the visualized constant volume solid gas coupling tester, the circumferential displacement test system, the coal particle gas emission tester, the gas expansion energy tester, the rock triaxial mechanical penetration tester, and the similar material permeability tester, had been developed to realize the accurate and comprehensive measurement and control of the coal rock gas characteristics under the specific conditions of high pressure gas; based on the comprehensive action hypothesis and basic theory, a multi-scale quantitative simulation experiment system of coal and gas outburst aiming at tunnel excavation induced outburst was developed, which could realize the real simulation of tunnel excavation induced outburst with three adjustable factors of in-situ stress, gas pressure and coal rock mass characteristics;it had innovated the functional technology and method technology. Taking the “6.12” outburst accident of Xinzhuangzi mine in Huainan as the prototype, the experiment simulation of coal and gas outburst induced by driving and uncovering coal under the condition of large-scale model loading, inflation and pressure maintaining had been successfully realized for the first time in the world.
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Published: 07 July 2020
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