地面水力压裂技术在彬长矿区特厚煤层临空工作面卸压的研究与应用

Application of surface hydraulic fracturing technology for pressure relief in gob-side working faces of extra-thick coal seams in Binchang mining area

  • 摘要:
    目的 针对陕西彬长矿区特厚煤层临空工作面因上覆厚硬顶板引发的冲击地压问题,
    方法 以雅店煤矿ZF1401工作面为工程背景,采用地面水力压裂技术对顶板进行预裂处理,弱化改性煤层上方40~60 m的中高位关键层,在煤层上方形成人造弱面缓冲结构,一方面衰减高位动载荷的传递,另一方面降低压裂层下方的静载荷,达到降低冲击危险,保证巷道安全回采的效果。
    结果及结论 研究结果表明,压裂后ZF1401工作面覆岩活动强度、中高位厚硬岩层大能量事件、回采扰动丛集效应、岩层破断能量释放占比、单位推进度能量、来压强度与范围、围岩变形等均有所降低,冲击风险显著降低,保障了临空工作面与巷道的安全性。

     

    Abstract: Aiming at the rock burst problem caused by the overlying thick and hard roof in gob-side working faces of extra-thick coal seams in the Binchang mining area of Shaanxi Province, we take the ZF1401 working face of Yadian Coal Mine as the engineering background. Surface hydraulic fracturing technology was adopted to pre-split the roof, weakening and modifying the medium–high key stratum located 40~60 m above the coal seam, thereby forming an artificial weak-plane buffer structure above the coal seam. This structure serves to attenuate the transmission of high-level dynamic loads on the one hand, and to reduce the static load below the fractured layer on the other, achieving the goal of reducing rock burst risk and ensuring safe roadway mining. The research results show that after fracturing, the overburden activity intensity, large-energy events in the medium–high thick and hard rock layers, mining-induced disturbance clustering effect, proportion of energy released by rock fracturing, energy per unit advance, weighting intensity and range, and surrounding rock deformation at the ZF1401 working face were all reduced. The rock burst risk was significantly lowered, thereby ensuring the safety of the gob-side working face and the roadways.

     

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