确定卸压瓦斯抽采钻孔合理层位的试验

Experimental study on determining the rational horizon of pressure-relief gas extraction boreholes

卸压瓦斯抽采技术的关键在于根据采动裂隙场分布规律合理布置瓦斯抽采孔。针对富含水厚煤层大采高工作面快速推进,依据采动裂隙时空演化特征与瓦斯运移规律,在亭南煤矿实施了确定卸压瓦斯抽采钻孔合理层位的工业试验。通过对不同层位钻孔抽采浓度统计分析,卸压抽采钻孔终孔布置在裂隙带离层区抽采效果最好,从而确定卸压瓦斯抽采钻孔的合理层位。

The key of the technology for pressure relieving drainage lies in decorating gas extraction hole reasona-bly based on the distribution rule of mining-induced fractures field. Aimed at thick coal seam enriched in water for large mining height and rapid development, on the basis of the characteristics of space-time evolution of min-ing-induced fractures and gas migration rule, the commercial test of the technology of pressure relieving drainage for reasonable horizon was confirmed in Nanting mine. According to the statistical analysis of different extraction concentration, the effect for end hole of pressure relieving drainage hole in the extraction zone of fissure zone was the best, so the reasonable horizon of pressure releasing gas drainage hole was determined.