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| Feature analysis of working face strata pressure with roof cutting pressure releasing in medium-thick seam and compound roof condition |
| HE Manchao1,MA Xingen1,2,WANG Jiong1,2,ZHANG Jiabin1,2,LIU Yuxing1,2 |
| (1. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;2. School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China) |
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Abstract 为探究切顶卸压自动成巷技术条件下的工作面矿压显现特征及机制,以塔山煤矿8304工作面为例,在对切顶成巷技术原理及工艺流程进行总结的基础上,提出具体成巷设计,随后通过现场监测、数值模拟以及理论推导等手段,对工作面的矿压分布特征及演化过程进行分析。监测结果显示:(1) 工作面中部来压步距最短、来压强度最高,且受留巷切顶影响,工作面来压步距及强度分布呈现非对称性;(2) 留巷侧顶板的周期来压步距较之未切缝侧较大,平均增幅为4 m,但来压压强降低,平均来压压强降低2.1 MPa,降幅9.2%,峰值来压强度降低10.2 MPa,降幅25.0%,切顶卸压效果明显,且峰值压力受切顶卸压影响更大;(3) 顺槽切顶于工作面的横向影响范围大致为29.75 m,越靠近切缝处影响效果越显著。数值模拟进一步发现:顺槽预裂切顶对工作面来压在走向方向上的超前影响范围约为20 m,超前影响范围内,影响程度随超前距离增加逐渐减小;在滞后工作面30 m范围内,滞后工作面距离越远,顺槽切顶卸压影响越大;在滞后工作面30 m之后,顺槽切顶影响幅度基本维持不变。
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