煤炭工程 ›› 2018, Vol. 50 ›› Issue (10): 25-29.doi: 10.11799/ce201810006

• 专题论坛 • 上一篇    下一篇

厚煤层综放临空巷道围岩稳定性分析及支护技术研究

韩征   

  1. 中煤西安设计工程有限责任公司
  • 收稿日期:2017-09-30 修回日期:2018-01-19 出版日期:2018-10-20 发布日期:2018-12-18
  • 通讯作者: 韩征 E-mail:53276029@qq.com

Research on stability of surrounding rock mass and supporting technology for gob-side roadway with fully mechanized top coal caving in thick coal seam

Zheng dHAN   

  • Received:2017-09-30 Revised:2018-01-19 Online:2018-10-20 Published:2018-12-18
  • Contact: Zheng dHAN E-mail:53276029@qq.com

摘要: 针对厚煤层综放临空巷道矿压显现剧烈的问题,以塔山矿5210沿空巷道受一次和二次采动影响下产生严重底鼓、围岩变形大、支护体疲劳失效的工程背景,通过现场观测和分析,得到了矿压显现剧烈的原因。高水平应力使巷道两帮煤柱对底板挤压,底板受拉与受压应力不平衡是造成底板岩层破坏和强烈底鼓的主要原因|锚杆长度不足,导致松动圈未能被有效加固是围岩产生大变形的原因|支护体失效的原因是随着工作面推进,老顶断裂产生的支承压力使得其发生疲劳失效。基于分析结果提出了“底板卸压法+长短全锚索加强支护+角锚索”的支护技术。现场试验结果表明,应用新提出的支护技术,超前支护段底鼓量平均减少了250mm,两帮及顶板变形量减少了100mm左右,支护体失效的情况显著减少,证明围岩控制得到了显著改善。

关键词: 厚煤层, 临空巷道, 围岩稳定性, 支护技术

Abstract: In order to sustain the surrounding rock mass stability for strong mining-induced gob-side roadway in thick coal seam, the failure mechanism was investigated by a case study with serious floor heaven, large surrounding rock mass deformation, supporting fatigue in Tashan coal mine. The observation results indicate the strong mining-induced pressure dominantly caused the floor heaven and the supporting fatigue, poor bearing capacity of the coal roof induced the large surrounding rock mass deformation. The supporting technology with releasing concentrated stress in floor and totally using cables in roof and upper corner was tested in the roadway. The test results proved this supporting technology has the good performance on enhancement of supporting stability and decrease of floor heaven and sidewall deformation by 250mm and 100mm, respectively.

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