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开滦集团某工作面的回采工艺为综放开采,开采强度大,瓦斯涌出量高。基于此,提出了该工作面的瓦斯治理模式:在“U+L”型通风方式的基础上,增设1个切眼和倾向高位瓦斯抽采钻孔,并采取措施调节回风巷和瓦斯排放巷的风量。然后,采用数值模拟手段对该瓦斯治理模式下的采空区瓦斯运移规律进行研究,并开展现场工程应用。结果表明,含有瓦斯的风流被诱导流入瓦斯排放巷和抽放钻孔,阻止了采空区深部瓦斯向上隅角的涌入,在很大程度上减小了采空区内部及工作面上隅角的瓦斯浓度,从而解决了上隅角瓦斯局部积聚的难题。
Kailuan Group, a face mining process for the fully mechanized mining, mining strength, gas emission high. Based on this, the gas management mode of the working face is put forward. Based on the “U + L” type of ventilation mode, an extra gas drilling hole with cut and high inclination is added and measures are taken to adjust the return airway Gas discharge Lane air volume. Then, numerical simulation is used to study the law of gas migration in the goaf under the gas treatment mode and carry out on-site engineering application. The results show that the airflow containing methane is induced to flow into the gas drainage lane and the drainage hole, preventing the influx of deep gas from the gob area to the upper corner and greatly reducing the internal and the upper corner of the working face Angle of gas concentration, which solved the upper corner of the local accumulation of gas problems.