倾斜煤层对沿空留巷支护体稳定性影响研究

Study on Influence of Inclined Coal Seam on Support Body Stability of Retaining Roadway Along Goaf

  • 摘要: 倾斜煤层对沿空留巷的支护稳定具有较大影响,为探究新甘庄煤矿不同倾斜煤层的沿空留巷稳定性,通过理论分析和数值模拟方法,研究倾斜煤层对沿空留巷支护体稳定性的影响,建立煤层倾角的沿空留巷力学模型,建立了在0°、22°、32°条件下的煤层倾角数值模型,展望倾斜煤层沿空留巷支护技术,针对不同情况提出了合理化建议。研究结果表明:随着煤层倾角增大,巷旁所需支护阻力增大,需要支护结构提供更大的支撑力以抵御倾斜引起的不利影响;随着煤层倾角增大,留巷支护体垂直应力峰值及范围扩大,且极大地削弱了支护体的稳定性,使其由弹性状态逐步转变为大范围的塑性破坏。

     

    Abstract: The inclined coal seam has a relatively significant impact on the support stability of retaining roadway along goaf.In order to explore the stability of retaining roadway along goaf in different inclined coal seams in Xinganzhuang Coal Mine,theoretical analysis and numerical simulation methods are used to study the influence of inclined coal seams on the support body stability of retaining roadway along goaf.A mechanical model of retaining roadway along goaf for coal seam inclination angle is established,and numerical models of coal seam inclination angle under 0°,22°,and 32° conditions are established.The prospect of the inclined coal seam retaining roadway along goaf support technology is conducted,and reasonable suggestions are proposed for different situations.The research results indicate that as the inclination angle of the coal seam increases,the required support resistance of the roadway side increases,and the support structure needs to provide greater supporting force to resist the unfavorable effects caused by inclination;As the inclination angle of the coal seam increases,the peak and range of the vertical stress of the retaining roadway support body expand,and greatly weaken the stability of the support body,causing it to gradually transition from an elastic state to a large-scale plastic failure.

     

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