复杂条件下巷道过断层段锚杆支护优化设计

Optimization of bolt support for roadway passing through fault section under complex conditions

  • 摘要: 巷道锚杆支护是煤矿安全重要影响因素。【目的】针对掘进工作面过断层时存在顶板变形破坏大、不易支护的问题,以两渡煤业10号煤层为工程实例,【方法】综合运用室内试验、理论分析等方法展开研究,运用模糊综合评判法对10号煤巷围岩进行分类,【结果】提出在过断层前后5 m处采用“锚索+钢带”的支护方案,结合现场顶板离层实测数据,并通过工业性试验长期跟踪可得,巷道顶底板最大变形量为52 mm,两帮最大变形量为36 mm,验证了支护方式的合理性。【结论】根据研究结果表明,采用“锚索+钢带”的加强支护方式能有效控制掘进工作面在过断层特殊地段时期安全开采。

     

    Abstract: Roadway bolt support is an important factor affecting coal mine safety. In view of the large deformation and damage of the roof during the period when the driving face passes through a fault, which makes it difficult to support. Taking the 10# coal seam of Liangdu Coal Industry as an engineering example, this study is carried out by comprehensively using methods such as laboratory tests and theoretical analysis. The fuzzy comprehensive evaluation method is used to classify the surrounding rock of the 10# coal roadway, and a support scheme of "anchor cable + steel strip" is proposed to be adopted at 5m before and after passing through the fault. Combined with the field measured data of roof separation and through long-term tracking of industrial tests, the maximum deformation of the roof and floor of the roadway is 52 mm, and the maximum deformation of the two sides is 36mm, which verifies the rationality of the support method. The research results show that the enhanced support method of "anchor cable + steel strip" can effectively ensure the safe mining of the driving face during the period of passing through the special section of the fault.

     

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