煤炭工程 ›› 2022, Vol. 54 ›› Issue (2): 37-42.doi: 10.11799/ce202202007

• 施工技术 • 上一篇    下一篇

深井软岩巷道穿厚煤层碎裂顶板区围岩控制技术

肖殿才1,蒋祥卿2,罗勇1,任波3,鲁德超1,唐义川4   

  1. 1. 淮南矿业(集团)有限责任公司深部煤炭开采与环境保护国家重点实验室
    2. 青海省能源发展(集团)有限责任公司生产技术部
    3. 平安煤炭开采国家工程技术研究院有限责任公司
    4. 淮南矿业(集团)煤业分公司潘三矿
  • 收稿日期:2021-10-25 修回日期:2021-11-08 出版日期:2022-02-14 发布日期:2022-07-06
  • 通讯作者: 肖殿才 E-mail:SKLXdiancai@126.com

Surrounding Rock Control Technology of Soft Rock Roadway through Thick Coal Seam Fractured Roof Area in Deep Well

  • Received:2021-10-25 Revised:2021-11-08 Online:2022-02-14 Published:2022-07-06
  • Contact: Xiao DianCai E-mail:SKLXdiancai@126.com

摘要: 针对深井软岩巷道穿厚煤层碎裂顶板区围岩控制技术难题,通过现场调查,分析工程破坏特点,结合钻孔窥视分析结果,得出巷道围岩变形失稳原因为破碎岩体降低了内层锚网的支护性能,未能与围岩形成统一承载体,围岩松动圈扩大及变形不均匀致使U型棚支护性能降低,支护阻力不足,围岩扩容膨胀,发生破坏。提出通过超前预注浆和组合金属骨架实现破碎围岩改性、围岩应力优化,形成稳定的承载结构,进而实现破碎岩体的二次承载,强化内层锚网支护效果,做到内锚有效、外架可靠。以此提出“超前预支护+内锚外架联合控顶+锁腿控帮+喷注补强+底板控水卸压”联合的组合控制技术,形成了锚固体与注浆围岩互相强化,强控顶、辅以控帮治底的联合支护体系|现场开展了工程实践,并取得了较好的支护效果。

关键词: 揭穿煤层, 破碎顶板, 超前支护, 注浆加固, 联合支护

Abstract: Aiming at the problem of surrounding rock control in deep soft rock roadway through thick coal seam cracked roof area, The characteristics of engineering failure are analyzed by field investigation,Combined with the analysis of borehole peep results,the reason for the deformation and instability of surrounding rock is concluded that the broken rock reduces the supporting performance of inner anchor net, fails to form a unified carrier with surrounding rock, the expansion of surrounding rock loose circle and uneven deformation lead to the decrease of supporting performance of U-shaped shed, Further lead to insufficient support resistance and the surrounding rock expands, until the destruction.In order to realize the secondary bearing capacity of the broken rock mass,A stable bearing structure is formed by modifying the broken surrounding rock and optimizing the stress of surrounding rock through pre-grouting and combination of metal framework,The supporting effect of inner anchor net is strengthened and the inner anchor is effective and the outer frame is reliable. Based on this, the combined control technology of "advance support + internal anchor and external frame combined control of roof +locking leg control of side wall + guniting and Grouting reinforcement+ Bottom plate water control and pressure relief groove relief " was proposed,The combined support system is formed, Including anchor solid and grouting rock mutually reinforcing, strong control of the roof, supplemented by control of the bottom; Through preliminary field engineering practice,good supporting effect has been achieved.

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