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针对高瓦斯、大风量及突出掘进面的治尘难题,提出掘进面“三压带”分段注水新方法,采用理论分析法对“三压带”分段注水机理进行研究;根据钻煤屑全水分分析法、滤膜测尘法及钻屑量称重法,分别对“三压带”采用分段注水前后煤体湿润半径、降尘效率及应力分布规律进行测试。结果表明,掘进面“三压带”采用分段注水后,煤层湿润半径达2 m左右;司机处及其后10 m处降尘效率分别达到66.5%、67.6%;卸压带被延伸到9 m左右,9～12 m范围内的集中应力带峰值相比注水前明显降低,能取得较好的防尘及防突效果。
Aiming at the problems of dust control in high gas and wind volume and prominent heading face, a new method of subsection water injection with “three pressure belt” was put forward. The theory of “three pressure belt” was used to study the subsection water injection mechanism. According to the method of total moisture analysis of drilling coal, filter dust measurement method and drill cuttings weighing method, the law of wetting radius, dust reduction efficiency and stress distribution before and after sub-injection was tested. The results show that the coal seam wetting radius is up to about 2 m after the sub-surface water injection on the driving face of the “three-pressure belt”, and the dust reduction efficiency reaches 66.5% and 67.6% respectively at the driver and at the subsequent 10 m. The pressure relief belt is extended to The peak value of concentrated stress in the range of 9 m to 12 m is obviously lower than that before water injection, and good dustproof and anti-bursting effect can be obtained.