含水率对煤与瓦斯突出能量转化影响试验

为获得煤层注水对煤与瓦斯突出弱化的影响规律,以阜新孙家湾煤矿埋深1100m突出煤层为研究对象,建立了煤与瓦斯突出能量转化模型,并利用自主研发的煤与瓦斯突出模拟试验系统,进行了含水率对煤与瓦斯突出试验影响研究,分析了煤样含水率与临界孔隙压力、突出强度、能量转化率之间的关系。试验结果表明:孔隙压力是煤与瓦斯突出的主要动力源,煤样含水率与临界孔隙压力间呈指数关系递增。煤样含水率由0%增加到3%、6%时,相对突出强度分别降低了5.67%、1.2%,随煤样含水率增加,相对突出强度与绝对突出强度将逐渐降低。瓦斯内能是影响煤体突出能量大小的关键因素,与突出孕育和突出激发过程均密切相关。随含水率增加,突出孕育能量和突出激发能量均线性增加,但突出能量转化率线性减小,不易发生煤与瓦斯突出。

Experimental study on the influence of water content on energy conversion of coal and gas outburst

In order to obtain the influence of water content on coal and gas outburst, the outburst coal seam of burial depth 1100m in Sunjiawan mine of Fuxin was taken as the research object. The energy conversion model of coal and gas outburst was established, and the relationships between water content of coal samples and the critical pore pressure, the outburst intensity and the energy conversion rate were analyzed experimentally by using self-developed simulated test system for coal and gas outburst. The results show that the pore pressure is the main power source of coal and gas outburst, and the water content increases with the critical pore pressure exponentially. When the water content is increased from 0% to 3% and 6%, the relative protruding strength is decreased by 5.67% and 1.2% respectively. With increasing water content of coal samples, the absolute and relative outburst intensities decrease gradually. The gas internal energy turns out to be the key influential factor for the outburst energy, and is closely related to the outburst preparation and excitation processes. With the increase of water content, both energies of outburst preparation and excitation increase linearly, but the conversion rate of the outburst energy decreases linearly. Coal and gas outburst thus are not easy to occur.