寺家庄矿下向穿层钻孔煤巷条带预抽技术的应用

 寺家庄矿煤与瓦斯突出灾害严重，突出事故时有发生，严重制约着该矿的安全生产，防突工作任务十分艰巨。寺家庄虽然为煤层群开采，但没有保护层开采的条件，为了实现“不掘突出头，不采突出面”的目标，掘进巷道区域防突采用顶板巷道下向穿层钻孔煤巷条带消突措施，由于这种措施是此煤层条件下的首次应用，需要对其基本工艺参数进行系统的考察。本文采用现场考察的方式，针对下向穿层钻孔煤巷条带预抽区域消突技术展开研究，探讨下向穿层钻孔的合理布孔间距。结果表明，预抽钻孔终孔间距小于2.0m时，预抽20d后残存瓦斯含量可降到7.86m3/t，达到了区域消突的标准。

Study on technology of regional gas predrainage for coal roadway band by downward crossing hole in Si Jia-zhuang coal mine

The gas outburst disasters are serious in Si jia-zhuang coal mine, and the casualty accidents caused by outburst occur frequently. So outburst prevention work task is gravely. The mining condition is coal seam group, but there are no conditions of protective seams extraction. In order to achieve the aim of no digging and mining in outburst dangerous area, a method of regional gas pre-drainage by downward crossing hole was adopted in SI Jia-zhuang coal mine. To achieve better effect, the optimization process parameters need be studied on-site. In this paper, the reasonable spacing of downward crossing hole for pre-drainage was studied. The results indicated that the residue gas content was decreased to 7.86m3/t after period 20 days per-drainage with 2.0m spacing in end hole, and up to the standards of outburst danger eliminating