煤炭工程 ›› 2025, Vol. 57 ›› Issue (2): 61-67.doi: 10. 11799/ ce202502009

• 施工技术 • 上一篇    下一篇

深部大断面巷道围岩破坏机理及控制技术

赵宝福   

  1. 1. 中煤天津设计工程有限责任公司,天津 300131

    2. 中煤(天津)地下工程智能研究院有限公司,天津 300131

  • 收稿日期:2024-04-07 修回日期:2024-06-28 出版日期:2025-02-10 发布日期:2025-04-28
  • 通讯作者: 赵宝福 E-mail:1953431256@qq.com

Failure mechanism and control technology of surrounding rock in deep large-section roadways

  • Received:2024-04-07 Revised:2024-06-28 Online:2025-02-10 Published:2025-04-28
  • Contact: Ming mingYang E-mail:1953431256@qq.com

摘要:

针对大海则煤矿深部大断面巷道强烈破坏难题,通过现场调研总结了大断面巷道破坏特征分析了大断面巷道破坏原因。在此基础上针对性的提出了以高承载力柔性锚杆为核心的支护优化方案。为了验证优化方案的合理性采用UDEC建立了Trigon模型,对比了原方案与优化方案两种情况下的巷道变形量、塑性区范围及围岩裂隙分布特征。模拟结果显示,采取优化方案后,围岩承载效果大幅提高,巷道变形量和塑性区范围明显降低,围岩内部裂隙数量大幅减少。现场开展工业性试验后巷道围岩在50d时趋于稳定顶板最大下沉量197mm,现场巷道整体成型效果较好。

关键词:

大断面巷道 , 破坏机理 , Trigon模型 , 裂隙 , 柔性锚杆

Abstract:

In response to the severe damage problem of deep and large section tunnels in the Dahaize coal mine, this article summarizes the characteristics of on-site tunnel damage through on-site investigation and reveals the mechanism of tunnel damage induction. On this basis, a targeted support optimization scheme with high bearing capacity flexible anchor rods as the core was proposed. In order to verify the rationality of the optimization plan, a Trigon model was established using UDEC, and the deformation amount, plastic zone range, and distribution characteristics of rock fractures in the roadway were compared between the original plan and the optimized plan under two different conditions. The simulation results show that after adopting the optimization scheme, the bearing capacity of the surrounding rock is significantly improved, the deformation and plastic zone range of the tunnel are significantly reduced, and the number of internal cracks in the surrounding rock is significantly reduced. After conducting industrial tests on site, the surrounding rock of the roadway tended to stabilize at 50 days, with a maximum subsidence of 197 mm in the roof. The overall shaping effect of the roadway on site was good.

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