深部巷道煤帮冲击破坏机制及支-卸循环带控制原理
Failure Mechanism of Coal-side Rock Burst in Deep Gateway and Control Principle of Support-depressurization Cycle Stripe
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摘要: 针对深部巷道煤帮冲击破坏问题，分析了煤帮冲击破坏显现形式、冲击孕育的功能分区、冲击过程中微裂隙串接连通特征及主控冲击裂隙。研究表明：巷帮冲击破坏显现型式主要包括冲塞滑移型、层裂抛掷型与粉碎弹射型3种。煤帮微裂隙通过横、纵、斜3个方向发生串接连通。煤帮冲击孕育的4个主要功能分区包括峰值应力区、摩擦限制区、压缩内裂区及外鼓薄弱区。微裂隙不同串接模式及4区不同联动模式将形成煤帮不同的冲击破坏形态。合理设置支-卸循环带是煤帮动力稳定性的控制方式之一。Abstract: According to the difficult problem of rock burst in deep coal roadway, the display modes of coal impact failure, the function partitions of coal sidewall, the concatenation characteristics of micro cracks, and the main impact fractures were theoretically analyzed. The results show that the display modes of coal impact failure mainly have three forms, including plugging-sliding mode, slabbing-throwing type, crushing-ejecting type. Coal sidewall could concatenate the micro-fractures through horizontal, vertical and diagonal direction. The function partitions of coal sidewall mainly included peak stress area, friction limits area, compressed and ruptured zon, evaginated and weak area. The different concatenation modes of micro crack, the different interactive modes of four areas would form the different modes of rock burst. It was one of ways to control dynamic stability of coal sidewall by combining support pattern with pressure relief method and forming the support-depressurization cycle stripe of coal sidewall．
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