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深部岩层动力灾害防控基本原理与工程学

Basic principle and engineering of dynamic disaster prevention and control in deep strata

  • 摘要: 深部煤炭开采已成为必然, 研究深部岩层动力灾害发生机理、防控原理及工程技术, 对于保障煤矿安全生产、践行煤炭托底保供国家要求具有重要意义。首先, 探讨了工作面推进方向覆岩、侧空覆岩、断层切割覆岩3种典型条件下其运动致灾动力学过程, 构建了覆岩结构力学模型, 解答了覆岩运动诱发巷道动力冲击的力学机制。然后, 基于深部岩层结构的复杂性、致灾特征的多样性, 提出了岩层空间结构全尺度调控方法, 揭示了从巷道围岩局部卸压到区域岩层改性全尺度卸压力学原理。最后, 阐明了以覆岩结构改性、上行卸压开采、煤层弱化、煤柱宽度设计、高预应力支护为主要内容的灾害防控基本原理, 并开展了多项防治工程实践。实践结果表明, 麦垛山煤矿水压致裂后围岩变形量减小了44.61%~46.53%, 枣泉煤矿大直径钻孔卸压后煤体位移降低了68.24%~77.78%, 大安山煤矿高强吸能支护后两帮变形量减小了62.5%, 上行卸压开采和多参量智能化监测预警平台分别在忻州窑矿和新巨龙煤矿取得了成功应用。

     

    Abstract: Deep coal mining has become inevitable. Research on the occurrence mechanism, prevention and control principle, and engineering technology of dynamic disasters in deep strata is of great significance for ensuring coal mine safety and practicing national requirements for stabilizing coal supply. Firstly, the dynamic disaster processes induced by overburden movement under three typical conditions, namely overburden in the working face advance direction, lateral overburden on the gob side, and overburden through fault cutting, were discussed. The corresponding mechanical models of overburden structure were established, and the mechanical mechanisms of roadway dynamic impact induced by overburden movement was solved. Then, based on the complexity of deep strata structure and the diversity of disaster-inducing characteristics, the full-scale control method for strata spatial structure was proposed. The mechanical principle of full-scale pressure relief, from local pressure relief of roadway surrounding rock to regional strata modification, was revealed. Finally, the basic principles of disaster prevention and control with the main contents of overburden structure modification, upward pressure relief mining, coal seam weakening, coal pillar width design, and high prestressed support were clarified, and many prevention and control engineering practices were carried out. The results show that the surrounding rock deformation in Maiduoshan Coal Mine decreases by 44.61%–46.53% after hydraulic fracturing; the coal displacement in Zaoquan Coal Mine drops by 68.24%–77.78% after large-diameter borehole pressure relief; and the rib deformation in Daanshan Coal Mine falls by 62.5% after high-strength energy absorption support. Upward pressure relief mining and a multi-parameter intelligent monitoring and early warning platform have been successfully applied in Xinzhouyao Coal Mine and Xinjulong Coal Mine, respectively.

     

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