Aiming at the problem of large amount of gas emission in gob in the working face of thin coal seam cutting and retaining,it is proposed to reduce the amount of gas emission in gob effectively by controlling air distribution in the working face,timely sealing and re-taining air leakage cracks in the working face of 6303.At the same time,high level drilling,low level drilling and buried pipe are used to extract gob gas.After the field application,the gas extraction in the goaf was stable at 4.5～7.2 m3/min,and the volume fraction of gas in the mining face and return air flow was controlled within 0.28%.No abnormal gas emission or sudden increase of volume fraction occurred during subsequent mining.The method of controlling air leakage in goaf and gas extraction in goaf adopted on site realizes the effective control of goaf gas in the working face of thin coal seam.
关键词
薄煤层/切顶卸压/沿空留巷/瓦斯治理
Key words
thin coal seam/top cutting pressure relief/keep lane along goaf/gas control
维普
万方数据