摘要
Abstract
Mechanical properties of coal and gas outburst are quite complex. The destruction of gaspressure 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 accelerate 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, a-coustic emission characteristics, relative gas emission, sorting of outburst coal, termination process of outburst and so on in coal disaster.关键词
煤与瓦斯突出/地应力/瓦斯压力/流变Key words
coal and gas outburst/ damage/ ground stress/ gas pressure, rheology分类
矿业与冶金
