煤矿井下综采面回撤通道安全支护技术的优化分析

    Optimization analysis of safety support technology for the retreat channel of fully mechanized coal mining face underground

    • 摘要: 为了实现沁和能源集团有限公司候村煤矿超高作业面设备高效、安全回撤,以3503作业面回撤通道为研究对象,通过理论分析、数值模拟及井下实际测量的方法对该区域基本顶的来压情况进行了分析。确定该区域的来压步距为18.9 m,当作业面和主回撤通道距离为7 m时受影响最大,当作业面在贯通前约2.4 m的位置时来压消失,而且巷道基本顶在下一个来压周期时会在距离回撤通道中心煤柱约5 m处。在对回撤过程中来压情况进行分析的基础上,针对性的提出了利用恒阻锚索+钢带进行分区支护、整体承压的创新型支护方案,根据实际应用表明,新的支护技术能够保证支架在回撤过程中巷道顶板的稳定性,整个作业面的大高度液压支架能够在11.5 d完成回撤,比传统回撤效率提升了33.2%,实现了超高型设备的快速、安全回撤。

       

      Abstract: In order to achieve efficient and safe equipment withdrawal in the ultra-high working face of Houcun Coal Mine of Qinhe Energy Group Co., Ltd., the 3503 working face withdrawal channel was taken as the research object. The pressure situation of the basic roof in the area was analyzed through theoretical analysis, numerical simulation, and underground actual measurement methods. The pressure step distance in this area has been determined to be 18.9 m. When the distance between the working face and the main retreat channel is 7 m, it is most affected. When the working face is about 2.4 m before the connection, the pressure disappears, and the basic roof of the tunnel will be about 5 m away from the center coal pillar of the retreat channel in the next pressure cycle. Based on the analysis of the pressure situation during the retraction process, an innovative support scheme using constant resistance anchor cables and steel belts for partition support and overall pressure bearing was proposed. Practical applications have shown that the new support technology can ensure the stability of the roadway roof during the retraction process of the support. The high height hydraulic support of the entire working face can complete retraction in 11.5 days, which is 33.2% more efficient than traditional retraction, It has achieved rapid and safe retraction of ultra-high equipment.

       

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