煤炭工程 ›› 2024, Vol. 56 ›› Issue (8): 59-64.doi: 10. 11799/ ce202408010

• 施工技术 • 上一篇    下一篇

厚硬顶板地面水力致裂防治冲击地压技术研究

王 飞,马文涛,亢晓涛,焦 伟,尚 楠,马江鹏,马宏源   

  1. 1. 陕西彬长文家坡矿业有限公司,陕西 咸阳 712000 2. 中煤科工开采研究院有限公司,北京 100013
  • 收稿日期:2024-07-01 修回日期:2024-08-02 出版日期:2023-08-20 发布日期:2025-01-17
  • 通讯作者: 马宏源 E-mail:mhy2021521@163.com

Rock burst prevention technology for hydraulic fracturing on thick and hard roof surface#br#

  • Received:2024-07-01 Revised:2024-08-02 Online:2023-08-20 Published:2025-01-17
  • Contact: 马 宏源 E-mail:mhy2021521@163.com

摘要:

针对深部煤矿仅采用局部卸压措施难以有效消除顶板型冲击地压难题,分析了厚硬顶板动静载荷叠加诱冲原理,提出了地面水力压裂改造顶板力源结构防治冲击地压技术,在此基础上,结合文家坡矿4107工作面开采及地质条件,进行地面水力压裂厚硬顶板试验,现场试验结果表明:厚硬顶板悬而不垮提供静载荷基础,突然破断提供动载荷增量,动静载荷叠加突破临界载荷诱发冲击启动;采取地面水力压裂致裂厚硬顶板,地层在压裂液压力的作用下能够大范围破裂, 地面压裂缝长301~332m, 缝高50~58m, 缝宽50~60m;通过人造解放层,降低厚硬顶板的强度和完整性,长梁变短梁,大块变小块。可见,地面水力压裂技术致裂顶板,降低了巷道围岩应力集中程度,保障了工作面顺利回采。

关键词: 厚硬顶板, 力源结构, 地面压裂, 源头治理, 冲击地压

Abstract:

The form of coal mine rockburst disasters is severe, and local pressure relief measures are difficult to effectively eliminate the problem of rockburst disasters. The prevention and control of rockburst are often in a passive state. In response to the difficult problem of preventing and controlling rockburst on the top plate of the working face, the principle of inducing rockburst on thick and hard roof is analyzed. The technology of preventing and controlling rockburst at the source of the roof force source structure in surface hydraulic fracturing transformation is proposed, and experiments are conducted on the 4107 working face of Wenjiapo Mine. The results show that the thick and hard roof provides static load increment without collapse, sudden fracture provides dynamic load disturbance, and the superposition of dynamic and static loads breaks through the critical load to induce impact initiation. Ground hydraulic fracturing causes cracks in the thick and hard roof, artificially liberating layers, reducing the strength and integrity of the thick and hard roof. Long beams become short beams, and large blocks become small pieces. The surface hydraulic fracturing technology causes the roof to crack, changing the overlying load from hard transmission to soft transmission, reducing the stress concentration level of the surrounding rock of the roadway, and ensuring the smooth recovery of the working face.

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