焦仕学,胡兆锋,万晓,等. 断层切割孤立煤体应力动态特征及协同卸压技术[J]. 煤矿安全,2024,55(2):116−124. doi: 10.13347/j.cnki.mkaq.20231011
    引用本文: 焦仕学,胡兆锋,万晓,等. 断层切割孤立煤体应力动态特征及协同卸压技术[J]. 煤矿安全,2024,55(2):116−124. doi: 10.13347/j.cnki.mkaq.20231011
    JIAO Shixue, HU Zhaofeng, WAN Xiao, et al. Dynamic stress characteristics of isolated coal by fault cutting and collaborative pressure relief technology[J]. Safety in Coal Mines, 2024, 55(2): 116−124. doi: 10.13347/j.cnki.mkaq.20231011
    Citation: JIAO Shixue, HU Zhaofeng, WAN Xiao, et al. Dynamic stress characteristics of isolated coal by fault cutting and collaborative pressure relief technology[J]. Safety in Coal Mines, 2024, 55(2): 116−124. doi: 10.13347/j.cnki.mkaq.20231011

    断层切割孤立煤体应力动态特征及协同卸压技术

    Dynamic stress characteristics of isolated coal by fault cutting and collaborative pressure relief technology

    • 摘要: 为了研究由断层切割形成的孤立煤体应力特征,防止孤立煤体应力集中区域在工作面回采期间发生冲击危险;以新巨龙煤矿6305工作面为例,建立了孤立煤体受力估算模型,得到冲击危险性指数Ic;提出了针对孤立煤体区域两侧巷道实施的“大直径钻孔卸压+爆破切顶卸压”协同卸压技术,并通过FLAC3D模拟协同卸压前后孤立煤体应力动态特征。结果表明:冲击危险性指数Ic=2.6>1.5,即孤立煤体平均支承压力超过临界冲击阈值易发生冲击;卸压前过F311断层后XF2断层处回采帮采动应力突增7.85 MPa,冲击危险程度升高;卸压后孤立煤体突出部位回采帮应力平均降低25.3%,非回采帮应力平均降低12.5%,卸压区域无大能量微震事件发生,钻屑量正常,卸压效果良好。

       

      Abstract: In order to study the stress characteristics of isolated coal body formed by fault cutting, the stress concentration area of isolated coal body can be prevented from impact risk during the mining of the working face. Taking the 6305 working face of Xinjulong Coal Mine as an example, the force estimation model of isolated coal body is established, and the impact risk index Ic is obtained. The collaborative pressure relief technology of “large-diameter drilling pressure relief + blasting cutting roof and pressure relief” is proposed for both sides of the isolated coal body area, and the dynamic stress characteristics of isolated coal body before and after collaborative pressure relief are simulated by FLAC3D. The results show that the impact risk index Ic=2.6>1.5, that is, the average abutment pressure of isolated coal is more than the critical impact threshold. After passing the F311 fault before pressure relief, the mining stress at the XF2 fault side suddenly increases 7.85 MPa, and the impact risk degree increases. After pressure relief, the stress on the mining side of isolated coal body outburst area is reduced by 25.3% on average, and the stress on the non-mining side is reduced by 12.5% on average. There is no large energy microseismic event in the pressure relief area, and the amount of drilling cuttings is normal.

       

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