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随着深部开采,煤与瓦斯突出作为我国煤矿最严重的自然灾害,其发生频度和强度越来越大。瓦斯压力是煤与瓦斯突出的关键动力源之一,针对其作用机制还不太清楚的实际情况,基于现场观察到的突出射流特征,引入射流理论,建立了煤与瓦斯突出的射流力学模型,推导了瓦斯压力与突出速度和突出流量间的关系表达式,分析了煤体密度对突出的影响。利用自主研制的可实时改变轴压的围压和孔隙压的主动突出式煤与瓦斯突出模拟仪,试验模拟了不同煤层开采深度下,当轴压和围压一定时,随着瓦斯压力的增加,最终发生煤与瓦斯突出的过程,得到了瓦斯压力与煤层深度和突出强度间的关系。研究结果表明:瓦斯压力与含瓦斯煤体突出速度及流量间均呈幂指数增长规律,与煤层开采深度具有线性关系,与突出强度间具有幂指数关系。瓦斯压力随深度增大的幅度为0.01 MPa/m,与前人研究结果一致。所得结论可供对煤与瓦斯突出机理的认识预测和防治参考。
With deep mining, coal and gas outburst as the most serious natural disasters in China’s coal mines, the occurrence frequency and intensity of more and more. Gas pressure is one of the key power sources of coal and gas outburst. In view of the fact that the mechanism of action is not clear enough, based on the prominent jet characteristics observed in the field, the jet theory is introduced to establish the jet mechanics model of coal and gas outburst, The expression of relation between gas pressure and protruding speed and protruding flow is deduced, and the influence of coal density on salient is analyzed. Using the self-developed active protruding coal and gas outburst simulator capable of changing the confining pressure and pore pressure of axial compression in real time, the experiment simulates the influence of gas pressure Finally, the process of coal and gas outburst occurred, and the relationship between gas pressure and coal seam depth and salient intensity was obtained. The results show that both the gas pressure and gas containing coal outburst velocity and flow rate have the exponential growth law, which has a linear relationship with coal mining depth and a power exponent relationship with protruding intensity. Gas pressure increases with the depth of the amplitude of 0.01 MPa / m, consistent with previous studies. The conclusions can be used to predict and control the coal and gas outburst mechanism.