杜儿坪煤矿62707工作面无煤柱切顶留巷施工工艺研究

Research on Construction Process of Non-coal Pillar Roof Cutting and Retaining Roadway in the 62707 Working Face of Du'erping Coal Mine

  • 摘要: 针对杜儿坪煤矿62707工作面因埋藏深(442~659 m)、地应力高导致轨道巷原支护方案强度不足、巷道变形严重的问题,提出无煤柱切顶留巷工艺。该工艺设计了一种基于顶板非对称应力分布的差异化锚索加固方案,通过沿巷道走向,在近切缝侧、巷道中间及远端侧平行布设三条锚索带,并根据各区域的应力特征,分别设置了1000 mm、2000 mm及4000 mm的非等距锚索排距;施工环节结合悬臂梁力学模型完成支护强度核算,采用10.8 m钻孔配置恒阻大变形锚索及树脂锚固剂,并配套实施双向聚能预裂切缝爆破及分区化临时支护措施。监测结果表明,该工艺有效将顶板离层高度控制在20 mm以内,底板上翘量限制在500 mm以下,月均变形量低于30 mm,整体效果优于传统煤柱护巷工艺。

     

    Abstract: Aiming at the problems of insufficient strength of the original support scheme and severe roadway deformation of the track roadway due to the high burial depth (442-659 m) and geostress in the 62707 working face of Du'erping Coal Mine, a non-coal pillar roof cutting and retaining roadway process is proposed. This process designs a type of differentiated anchor reinforcement scheme based on the roof asymmetric stress distribution, through along the direction of the roadway, three anchor cable belts are arranged in parallel near the side of cutting seams, in the middle of the roadway, and at the far end. According to the stress characteristics of each area, non-equidistant anchor cable row spacing of 1000 mm, 2000 mm, and 4000 mm are set respectively; The construction links are combined with the mechanical model of the cantilever beam to complete the support strength check computation. A 10.8 m borehole is adopted to configure constant resistance large deformation anchor cable and resin anchoring agent, and corresponding measures of bidirectional energy gathering pre-splitting and cutting blasting and zoning temporary support are implemented. The monitoring results show that this process effectively controls the height of the roof abscission layer within 20 mm, limits the upward curling amount of the floor to below 500 mm, and the monthly average deformation amount is less than 30 mm, the overall effect is better than the traditional coal pillar roadway protection process.

     

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