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针对煤矿穿层水力扩孔孔硐体积过大,容易造成孔硐内瓦斯积聚,成为掘进过程中的致灾因素这一问题,采用FLAC~(3D)软件中Cvisc黏弹塑性模型,模拟薛湖煤矿不同扩煤量的穿层水力扩孔措施孔壁及周围煤体变形破坏过程;在薛湖煤矿底抽巷道开展穿层水力扩孔现场试验,将数值模拟结果与现场验证结果对比分析。结果表明,穿层水力扩孔技术措施完工后,受周围煤体压力影响,孔硐周围煤体快速进入塑性区并呈现蠕变特性,向扩孔中心整体径向移动,扩孔孔壁在持续的蠕变过程中变形破坏。对比分析扩孔后的孔硐体积变化程度,从安全生产的角度出发,最终确定适合薛湖煤矿的合理扩煤量为1.15 t/m。
In view of the problem that the volume of hydraulic reaming hole is too large and the gas in the hole is likely to accumulate, which is the disaster-causing factor in the driving process, the Cvisc viscoelastic-plastic model in FLAC 3D software is used to simulate Xue Lake In the coal mine, different layers of coal are drilled to expand the hole by hydraulic expansion measures to deal with the deformation and failure of the hole wall and the surrounding coal body. A field test is carried out in the tunnel of Xuehua coal mine, and the numerical simulation results are compared with the field verification results. The results show that after completion of the technical measures of hydraulic reaming through strata, the coal surrounding the borehole quickly enters into the plastic zone and exhibits creep characteristics due to the pressure of the surrounding coal, and moves radially to the center of the reaming center. Deformation during the creep damage. By comparative analysis of the change of pore volume after reaming, from the point of view of safety production, the reasonable amount of coal expansion suitable for Xuehu coal mine is 1.15 t / m.