Research on Damage Dynamical Evolution Mechanism of Coal and Gas Outburst
Mechanical properties of coal and gas outburst are quite complex. The destruction of gas pressure gradient on the coal flow is rarely considered in present study. Based on the new understanding of coal mechanical properties, considering the damage of coal, this paper comprehensively considers the physical and mechanical properties of coal, including the rheological properties, ground stress and gas pressure, etc. According to the nonlinear elastic properties of coal in the mechanical test results, based on the effect of gas pressure and ground stress in the outburst process, the coal and gas outburst is dynamic mechanical process with a strong time effect, which is divided into four stages: preparation, launch, development and termination. The article describes the occurrence mechanism of coal and gas outburst that caused by the accelerated damage evolution in the gas pressure, stress and gravity. Consequently coal gas pressure gradient within the wall is the main power source. The ground stress only plays a supporting role in the outburst. The article also explains and analyzes the extension, hole shape, acoustic emission characteristics, relative gas emission, sorting of outburst coal, termination process of outburst and so on in coal disaster.
coal and gas outburst damage ground stress gas pressure rheology
WU Yu-liang YANG Fu-he
Laboratory of Coal Resources and Mine Safety, China University of Mining Technology, Beijing 100083, Sichuan Provinces Academy of Safety Science and Technology, Chengdu 610016, China
国际会议
The 2nd International Conference on Mine Safety and Environment Protection(第二届采矿、安全与环境保护国际会议)
西安
英文
186-192
2011-10-10（万方平台首次上网日期，不代表论文的发表时间）