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随着综放工作面开采强度以及开采深度的加大,采空区瓦斯涌出量越来越大,传统的内错尾巷布置方式已在某种程度上显示出了不适应性,主要体现在由于顶煤冒落,内错尾巷易提前塌透而与工作面沟通,无法有效排放采空区瓦斯。基于此,探讨了改变内错尾巷布置高度加强采空区瓦斯排放的方法,并运用CFD技术,对此进行了数值模拟研究。结果表明:内错尾巷布置高度上移一定距离比传统布置在开采层中能更加有效地控制采空区瓦斯向工作面的涌出。现场的工程试验也进一步证明了内错尾巷布置层位的提高,能够明显提高瓦斯排放效果。
With the increase of mining intensity and mining depth in fully mechanized top coal caving face, the amount of gas emission from goaf increases more and more. The traditional layout of tailing lanes has shown some incompatibility mainly manifested Due to the top coal caving, within the wrong end of the tunnel easily collapsed and communicate with the face, can not effectively discharge the gob of gas. Based on this, the method of changing the height of staggered tailings and laneways to enhance the gas emission in goaf was discussed, and the CFD technique was used to study the numerical simulation. The results show that the height of the staggered tail lane can be shifted upward a certain distance more than the traditional layout in the mining floor to control the gushing of goaf to the working face more effectively. The field engineering test further proves that the inner strata of staggered tail lanes are increased, which can obviously improve the gas drainage effect.