煤炭工程 ›› 2022, Vol. 54 ›› Issue (11): 79-83.doi: 10.11799/ce202211015

• 施工技术 • 上一篇    下一篇

富水弱胶结顶板巷道支护优化设计研究

陈康,杨张杰,王福海,王威,王庆牛   

  1. 安徽省煤炭科学研究院
  • 收稿日期:2022-03-31 修回日期:2022-05-29 出版日期:2022-11-15 发布日期:2023-03-09
  • 通讯作者: 杨张杰 E-mail:yangzhangjie@sina.com

Study on Optimal Design of Roadway Support with Rich Water and Weak Cementation Roof

  • Received:2022-03-31 Revised:2022-05-29 Online:2022-11-15 Published:2023-03-09

摘要: 为了解决西部煤矿富水弱胶结顶板巷道支护优化设计的问题,通过对西部煤矿富水弱胶结顶板取芯岩石试件试验研究,得出其岩石试件在浸水24h后即达到浸水饱和状态,在垂向上易发生膨胀变形离层,且单轴抗压强度较常态下降低了18.9%。根据试验结果及现场实际地质情况,提出了断面优化、顶板支护锚固力增强优化技术、巷道的梯度锚固优化技术这三种针对性的巷道支护优化设计。现场观测结果表明:在经过巷道支护优化后,巷道掘进期间顶板浅深部离层绝大多数都在0~10mm内分布,巷道围岩锚杆(索)增幅载荷大部分在11~30kN分布,均在锚杆及锚索的承载能力范围内,巷道掘巷期间矿压显现不明显。实现了巷道掘进安全支护,同时为西部煤矿富水弱胶结顶板巷道支护进行了优化支护实践论证。

关键词: 西部煤矿, 弱胶结围岩, 支护优化, 巷道断面, 锚杆(索)支护, 锚固力

Abstract: In order to solve the problem of optimal design of roadway support of water rich and weakly cemented roof in western coal mine, through the experimental study of coring rock samples of water rich and weakly cemented roof in western coal mine, it is concluded that the rock samples reach the water saturated state after immersion for 24 hours, are prone to expansion deformation and delamination in the vertical direction, and the uniaxial compressive strength is 18.9% lower than the normal. According to the test results and the actual geological conditions on site, three targeted roadway support optimization designs are proposed: section optimization, roof support anchoring force enhancement optimization technology and roadway gradient anchoring optimization technology. The field observation results show that after the optimization of roadway support, most of the shallow and deep separation layers of the roof are distributed within 0 ~ 10mm during roadway excavation, and the increased load of the bolt (cable) of the surrounding rock of the roadway is mostly distributed within the range of 11 ~ 30KN, within the bearing capacity of the bolt and cable. The ground pressure is not obvious during roadway excavation. The safe support of roadway is realized, and the optimal support practice demonstration is carried out for the roadway support of water rich and weakly cemented roof in western coal mine.

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