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在煤层群开采过程中,本煤层开采会使得工作面围岩应力重新分布,邻近煤层内赋存的吸附态瓦斯卸压解吸。同时岩层移动与破断在上覆煤岩层中形成采动裂隙,瓦斯大量涌入工作面。为了解决临近层瓦斯涌出造成的工作面瓦斯超限,通过研究上覆岩层破坏规律并结合工作面原有瓦斯抽放状况,对原有抽放钻孔参数进行优化,优化后钻孔瓦斯抽放浓度提高了21.2%,工作面风排瓦斯量降低了18.33%,安全性大大增加。
During the process of coal seam group mining, the mining of the coal seam will redistribute the stress of the surrounding rock of the working face and desorb the desorption of adsorbed gas in the adjacent coal seam. At the same time, the formation moves and fractures in the overlying coal seam to form mining fractures, and a large amount of gas influx into the working face. In order to solve the gas overrun caused by gas emission in adjacent layers, the original drilling parameters are optimized by studying the failure law of overlying strata and combining with the original gas drainage condition in the working face. After optimization, the drilling gas drainage Put the concentration increased by 21.2%, the face of the wind gas emissions decreased by 18.33%, greatly increased safety.