爆破扰动诱发煤与瓦斯突出机理研究

Mechanism Study of Coal and Gas Outburst Induced by Blasting Disturbance

炮采依然是一些高瓦斯矿区的主要开采方式,研究爆破扰动诱发突出的机理具有重要的理论与实际意义。通过理论计算和数值模拟分析了爆破扰动诱发煤与瓦斯突出的机理。研究表明,炮采工作面煤体及围岩裂隙发育,瓦斯运移通道较多,有利于瓦斯的运移和集聚;爆破扰动减弱了瓦斯的吸附能力,增加了瓦斯的游离量;爆破使巷道潜能瞬间释放,造成煤岩体的应力状态发生突变,而应力的急剧变化在一定的条件下极易导致煤体的瞬间失稳而诱发煤与瓦斯突出。

Blasting is still the main mining method in the high-content gas region, and thus the mechanism study of coal and gas outburst induced by blasting disturbance has an important theoretical and practical significance. This mechanism was analyzed by theoretical calculation and numerical simulation. The study showed that the fracture of coal body and surounding rock at the working face of blasting mining developd, and many gas migration channels exsisted. Above two factors were conductive to the gas migration and agglomeration. The blasting disturbance reduced the adsorption capacity of the gas and increased the amount of free gas. Blasting made the roadway potency instantaneously release, resulting in the sudden change of coal rock stress state, and nevertheless the rapid change of stress under certain conditions could easily lead to the instantaneous loss of coal stability and induce coal and gas outburst.