煤炭工程 ›› 2021, Vol. 53 ›› Issue (11): 48-52.doi: 10.11799/ce202111010

• 施工技术 • 上一篇    下一篇

中厚煤层坚硬顶板切顶卸压自成巷切顶效果及应用研究

杨威,周谢康,祖自银,但伸富,曹俊才,马振乾,许飙   

  1. 1. 贵州盘江煤电集团技术研究院有限公司, 贵州 贵阳 550081
    2. 贵州大学 矿业学院, 贵州 贵阳 550025
    3. 贵州林东矿业集团有限责任公司 红林煤矿, 贵州 毕节 551614

  • 收稿日期:2021-04-15 修回日期:2021-05-14 出版日期:2021-11-20 发布日期:2022-01-05
  • 通讯作者: 周谢康 E-mail:zxk960127@126.com

Research and engineering application of roof cutting effect of self-made roadway with hard roof cutting and pressure releasing in gob-side entry retaining

  • Received:2021-04-15 Revised:2021-05-14 Online:2021-11-20 Published:2022-01-05

摘要:

切顶卸压沿空留巷是提高煤炭采出率和减少巷道万吨掘进率的关键技术, 以红林煤矿39114工作面为工程背景, 基于理论分析和数值模拟分析了巷道临空侧切顶与未切顶巷道围岩应力、位移的变化规律, 揭示了留巷围岩垂直应力与顶板层位、工作面距离之间的相互关系。研究结果表明: 超前工作面临空侧帮部切顶后的应力峰值由21.91MPa降至20.43MPa, 降低了1.48MPa, 且在帮部2m 处卸压幅度最大; 滞后工作面15m范围内, 实体煤帮切顶后应力峰值有所降低, 应力集中区域位于实体煤帮4m~6m 范围内, 且应力峰值降低的幅度与滞后工作面的距离呈正相关; 切顶后巷道顶板下沉量普遍减小, 最大下沉量由756mm下降至552mm, 减小了204mm, 在现场进行了工业性试验, 巷道留巷后, 能满足下区段服务要求, 对中厚煤层坚硬顶板切顶卸压自成巷技术推广具有借鉴意义。

关键词: 坚硬顶板, 切顶卸压, 围岩应力, 巷道支护, 围岩控制

Abstract:

roof cutting and pressure releasing and Gob-side entry retaining(GER) is a key technology to increase the coal recovery rate and reduce the roadway excavation rate of 10000 tons. The effect of roof cutting and pressure releasing is a key factor in determining the success of the GER. Based on the engineering background of 39114 working face in Honglin Coal Mine, this paper discusses the change law of the surrounding rock stress and displacement of roadway with cut roof and uncut roof at the roadway facing the roadway based on theoretical analysis and numerical simulation.The relationship between the vertical stress of the surrounding rock and the distance of the leading working face is revealed.The research results show that after the roof is cut, the surrounding rock of the roadway roof forms a stress relief zone with the advancement of the working face. The stress of the roadway roof and the surrounding rocks of the two sides decreases as a whole, and the displacement of the roof is reduced. This optimizes the surrounding rock stress environment of the roadway and reduced the difficulty of surrounding rock control .

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