深部煤矿切顶卸压技术及效果评价研究进展

Research progress in roof cutting and pressure relief technology and its effect evaluation in deep coal mines

  • 摘要: 现有切顶卸压研究多关注工艺参数与工程应用,对卸压程度适宜性、卸压过程可控性及卸压效果持续性3个维度,缺乏全过程协同评价,从而难以及时识别卸压不足或过度卸压等问题。围绕切顶卸压效果评价,系统查阅相关文献归纳了钻屑法、微震监测、应力监测和分布式光纤监测的指标,分别从点位应力、区域破裂、应力重分布和连续变形4个层面对卸压效果开展研究,并提出“切顶前基线识别—切顶中动态反馈—切顶后效果验证—长期稳定性跟踪”的多源协同评价思路。研究认为,切顶卸压效果评价不宜脱离工程背景设定统一绝对阈值,而应结合切顶前后、切顶区与未切顶区的相对变化,以及多源监测结果在空间位置、时间演化和变化趋势上的一致性进行综合判别。研究为深部煤矿切顶卸压技术研究和工程实践提供借鉴。

     

    Abstract: Existing studies on roof cutting and pressure relief mainly focus on their process parameters and engineering applications. However, they are limited in their whole-process coordinated evaluation on the appropriateness, controllability and sustainability of pressure relief, resulting in failure to timely identify insufficient or excessive pressure relief. This study therefore proposes a multi-source coordinated evaluation framework incorporating pre-cutting baseline identification, dynamic feedback during roof cutting, post-cutting effect verification and long-term stability tracking to enhance the effect evaluation of roof cutting and pressure relief. It characterizes the pressure-relief effect from point-scale stress, regional fracturing, stress redistribution and continuous deformation by summarizing the evaluation indicators of the drilling cutting method, microseismic monitoring, stress monitoring, and distributed fiber-optic monitoring. Results indicate that, instead of adopting site-independent absolute thresholds, the effect evaluation of roof cutting and pressure relief should take into account the relative changes of areas with and without, before and after roof cutting and the consistency of multi-source monitoring in spatial location, temporal evolution, and variation trends. The research findings can provide valuable reference for the study and engineering practice of roof cutting and pressure relief technology in deep coal mines.

     

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