平煤十三矿沿空掘巷窄煤柱留设及支护技术应用实践

    Application practice of narrow coal pillar reservation and support technology in gob side driving in No.13 mine of Pingmei

    • 摘要: 窄煤柱留设尺寸及围岩支护控制关乎沿空掘巷的成功与否,也是煤矿安全生产的关注重点。为摸清沿空掘巷煤柱留设尺寸与围岩运动特征之间的规律,设计合理的支护参数,以平煤十三矿现场实际需求出发,采用数值模拟的手段模拟分析了不同煤柱尺寸下围岩运动特征,结合理论计算确定了沿空掘巷窄煤柱合理留设尺寸,设计了动压巷道支护参数,并模拟分析了巷道支护控制效果,最后将设计的围岩控制方案进行了现场应用及围岩观测。研究结果表明:平煤十三矿工况条件下沿空掘巷窄煤柱留设尺寸为5 m时,巷道断面收缩率最小;提出的组合支护方案参数设计合理可行,现场观测受采动影响巷道断面收缩率控制在15%以内,围岩控制效果较好。研究成果能够为类似工况条件下煤矿工程施工提供可鉴经验。

       

      Abstract: The size of narrow coal pillar and surrounding rock support control are related to the success of driving along goaf, and also the focus of coal mine safety production.In order to find out the law between the reserved size of coal pillar and the movement characteristics of surrounding rock, and to design reasonable support parameters, the movement characteristics of surrounding rock under different sizes of coal pillar are simulated and analyzed by means of numerical simulation based on the actual demand of Pingmei No.13 coal mine.The reserved size of narrow coal pillar along the goaf is determined by theoretical calculation, and the supporting parameters of dynamic pressure roadway are designed.The control effect of roadway support is analyzed.Finally, the design scheme of surrounding rock control is applied in the field and observed.The research results show that under the working condition of No.13 coal mine, when the size of narrow coal pillar is 5 m, the reduction rate of roadway section is the smallest; the parameter design of combined support scheme proposed is reasonable and feasible, the reduction rate of roadway section under the influence of mining is controlled within 20%, and the surrounding rock control effect is good.The research results can provide valuable experience for coal mine construction under similar working conditions.

       

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