浅埋厚硬顶板煤层巷道围岩支护参数优化

    Optimization of surrounding rock support parameters for shallow buried thick and hard roof coal seam roadway

    • 摘要: 为保证煤炭安全高效绿色开采,避免优质顶板条件下巷道的过度支护问题,以山西某煤矿为研究对象,采用理论分析、实验室试验、数值模拟同工程实践相结合的方法,分析获得了浅埋煤层厚硬顶板围岩力学参数及岩体特征,基于自然平衡拱理论重新设计了4种15#煤层一采区辅运巷道支护方案,并利用有限元数值模拟软件对原方案与其他支护方案在采动影响下巷道围岩变形量、应力分布规律、塑性区发育范围进行了对比分析。研究结果表明:使用优化方案后,围岩应力积聚处于可控范围内,顶板最大下沉量65.19 mm,底鼓量30.39 mm,帮鼓量174.59 mm,每百米节省锚杆(索)量23.08%,巷道掘进速度显著提高。

       

      Abstract: In order to ensure the safe, efficient and green mining of coal and avoid the problem of excessive support of roadway under the condition of high-quality roof, taking a coal mine in Shanxi as the research object, the mechanical parameters and rock mass characteristics of thick and hard roof surrounding rock in shallow coal seam are analyzed and obtained by using the methods of theoretical analysis, laboratory test, numerical simulation and engineering practice. Based on the theory of natural balance arch, four supporting schemes for auxiliary transportation roadway in No.1 mining area of 15# coal seam are redesigned, And finite element numerical simulation software is used to compare and analyze the deformation, stress distribution, and plastic zone development range of the surrounding rock of the roadway under the influence of mining between the original plan and other support plans. The results show that after using the optimization scheme, the stress accumulation in the surrounding rock is within a controllable range, with a maximum subsidence of 65.19 mm in the roof, a bottom heave of 30.39 mm, and a side heave of 174.59 mm. The amount of anchor rods(cables) saved per 100 meters is 23.08%, and the tunnel excavation speed is significantly improved.

       

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