煤炭工程 ›› 2024, Vol. 56 ›› Issue (3): 32-38.doi: 10.11799/ce202403006

• 施工技术 • 上一篇    下一篇

深部综放开采软岩巷道切顶卸压自成巷技术研究

于滨   

  1. 中国矿业大学(北京)力学与建筑工程学院
  • 收稿日期:2022-05-07 修回日期:2022-08-17 出版日期:2024-03-20 发布日期:2024-03-25
  • 通讯作者: 于滨 E-mail:1368899126@qq.com

Study on Technical of Mine Directional pre-split blasting for gob-side entry retaining in Fully Mechanized working Face

  • Received:2022-05-07 Revised:2022-08-17 Online:2024-03-20 Published:2024-03-25

摘要: 针对鸟山井田深部综放开采软岩巷道支护难度大的难题, 阐释了深部岩层非线性的应力应变特征, 在综放面采用切顶卸压自成巷技术, 同时采用理论分析、数值模拟和工程试验, 研究了深部留巷的可行性, 将留巷过程分为三个区并提出了针对性控制对策。将该技术在鸟山煤矿11031 综放工作面回风巷道进行现场试验, 现场监测结果表明: 该巷道从掘进开始到回采结束, 顶板下沉量表现出切缝侧大于巷中大于实体煤帮的规律, 最大下沉量分别为155, 128, 81 mm, 顶板离层量稳定时约119 mm, 数值模拟结果表明切缝后顶板最大下沉量为175mm, 有效控制了深部软岩巷道围岩变形, 各项监测指标良好, 验证了针对该综放面深部留巷设计的正确性。

关键词: 深部煤层, 支护设计, 切顶卸压自成巷, 沿空留巷

Abstract: Niaoshan Coal Mine introduced fully mechanized top coal caving and gob-side entry retaining technology during the mining process of 11031 working face. Mineral pressure of working face and deformation law of surrounding rock of roadway. Theoretical analysis and calculation, mine pressure monitoring analysis and research show that the optimal depth of pre-split slit is 14.0 m, and the slit angle is 20°. During the construction period, the moving amount of roof and floor was finally stabilized at 79 mm, and the moving amount of the two sides was stable at 87 mm. The deformation of the roadway was small, and the average pressure of the 110 method area (the side of the cutting seam) was lower than that of the 121 method area (the side away from the cutting seam). 25.1%, and achieved good results, filling the gap of gob-side entry retention technology for roof cutting and pressure relief in Niaoshan Coal Mine.

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