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完全沿空掘巷支护技术研究

Supporting Technology of Roadway Completely-Driven along Gob

  • 摘要: 基于辽宁某煤矿1201工作面完全沿空掘巷地质条件,针对巷旁支护体在动压作用下容易破坏的特点,采用巷旁支护体顶部施加柔性垫层及侧向施加预应力钢筋的措施。沿空巷道巷内支护采用高强度预应力锚杆锚索支护系统,并进行巷道煤壁侧帮W型钢带以及贴帮支设木支柱加强支护,以消除巷道内不均衡载荷。FLAC3D数值模拟结果表明:巷旁支护体切顶能力强、沿空巷道支护效果良好。现场试验巷道位移量观测表明:沿空巷道稳定性好,完全沿空掘巷支护方案可以应用到现场。

     

    Abstract: For the geological condition of roadway completely driven along gob in 1201 mining face of a mine in Liaoning Province,roadway-side supporting body was easily be destroyed by dynamic force.Flexible cushion was added at the top of supporting body and pre-stress steel bar was applied at the side of supporting body.Pre-stress anchored bolt and cable supporting system was used in roadway supporting,aided by W-style steel belt at the coal side and wood prop for reinforcement,to eliminate unbalance load.FLAC3Dnumerical simulation found that cutting roof ability of roadway-side supporting was strong and supporting effect was excellent.Field observation for roadway displacement showed that the roadway driven along gob was stable and that the support project could be used in practice.

     

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