煤矿安全2026，Vol.57Issue(6)：83-91,9.DOI:10.13347/j.cnki.mkaq.20250929
高压射流螺旋割缝增透关键技术研究
Research of key permeability enhancement technology by high-pressure jet helical slotting
摘要
Abstract
To address the problem of low gas drainage efficiency in high-in-situ-stress and low-permeability coal seams,a high-pres-sure jet helical slotting technology was proposed based on the engineering background of the Zhaotong Tunnel on the newly built Chongqing-Kunming high-speed railway.The slotting mechanism and parameters of this technology were expounded through theor-etical analysis.Numerical simulation was used to reveal the coal mass damage and seepage evolution laws of the high-pressure jet helical slotting technology,and the influences of helical slotting parameters on coal seam pressure relief were investigated.Field tests were carried out in combination with engineering practice.The results show that the multi-stage helical structure formed in coal by high-pressure jet helical slotting can effectively disperse and transfer stress.The gas drainage radius reaches 2.6 m,which is 6.5 times that of conventional boreholes and 1.37 times that of hydraulic slotting.Among the slotting parameters,the slotting pitch exerts a sig-nificant influence on in-situ stress relief and permeability improvement of coal seams.A smaller pitch leads to a smaller fluctuation amplitude of the coal seam stress curve and a denser stress-weakened zone,resulting in a significant stress reduction in the near-field coal mass and more sufficient pressure relief in the far-field coal mass.In field application,the gas volume fraction drained by high-pressure jet helical slotting ranges from 68.83％to 87.35％,which is 2.24 times that of conventional boreholes and 1.26 times that of hydraulic slotting,respectively.The net gas drainage rate is 0.058-0.123 m3/min,equivalent to 3.32 times that of conventional bore-holes and 1.32 times that of hydraulic slotting,respectively.关键词
高压射流螺旋割缝/割缝参数/煤体损伤/卸压增透/瓦斯抽采Key words
high-pressure jet helical slotting/slotting parameter/coal body damage/pressure relief and permeability enhancement/gas drainage分类
矿业与冶金引用本文复制引用
田紫微,吕敬钱,俞学平,蒋志刚,王清焱,吴华..高压射流螺旋割缝增透关键技术研究[J].煤矿安全,2026,57(6):83-91,9.基金项目
云南省重大科技计划资助项目(202303AA080004) （202303AA080004）
