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基于深部开采高瓦斯工作面煤层扩容特性及采动扩容致灾机理,阐述了工作面煤体扩容力学行为的演化特征,揭示了扩容诱发煤与瓦斯动力灾害的力学本质.首次提出工作面近场钻孔减压控制扩容主动防控方法,研发了小孔径钻进-水力洗扩孔-大孔径套孔的湿式成孔技术.结果表明:控制煤体扩容的主动防控方法能有效消除了工作面煤层采动应力集中,大幅度降低瓦斯压力,实现工作面近场动力灾害主动防控.
Based on the characteristics of coal seam dilapidation and the mechanism of coal mining capacity expansion caused by deep mining, the evolution characteristics of coal mass expansion mechanics behaviors are expounded, and the mechanical properties of coal and gas dynamic disaster induced by coal dredging are revealed. Drilling and decompression control expansion and expansion of active prevention and control methods, developed a small hole drilling - hydraulic wash expansion hole - large hole sleeve hole wet forming technology.The results show that: the active prevention and control of coal expansion measures can effectively eliminate the work Face coal mining stress concentration, a significant reduction of gas pressure to achieve active face near-field dynamic disaster prevention and control.