煤炭工程 ›› 2025, Vol. 57 ›› Issue (11): 64-73.doi: 10. 11799/ ce202511009

• 施工技术 • 上一篇    下一篇

缓倾斜煤层坚硬顶板水力压裂弱化机制研究及应用

杨旭,张俭,郑三龙, 戴楠,崔峰,刘浩,李红平,王泽阳,王豪杰   

  1. 1. 国家能源集团新疆能源有限责任公司,新疆 乌鲁木齐 830000 2. 中煤科工西安研究院(集团)有限公司,陕西 西安 710054 3. 西安科技大学 能源学院,陕西 西安 710054 4. 新疆工程学院 新疆煤炭资源绿色开采教育部重点实验室,新疆 乌鲁木齐 8300234 5. 新疆工程学院 新疆煤炭绿色智能开采工程研究中心,新疆 乌鲁木齐 8300234
  • 收稿日期:2024-10-08 修回日期:2025-06-25 出版日期:2025-11-10 发布日期:2026-01-09
  • 通讯作者: 杨旭 E-mail:497468320@qq.com

Research and application of hydraulic fracturing weakening mechanism for hard roof of gently inclined coal seams

  • Received:2024-10-08 Revised:2025-06-25 Online:2025-11-10 Published:2026-01-09
  • Contact: xu yang E-mail:497468320@qq.com

摘要:

针对缓倾斜煤层坚硬顶板悬顶难垮落引发的冲击地压问题,以宽沟煤矿I010206工作面为工程背景,提出水力压裂顶板弱化技术。通过理论分析、数值模拟与现场监测,优化压裂参数(孔径133mm、注水压力25 MPa、流量40m3),采用双封单卡分段压裂工艺。结果表明: 压裂形成水平缝主导的复杂裂缝网络, 影响半径15~30m,顶板完整性显著破坏;支架周期来压步距缩短至10. 4~11.6 m,应力集中系数降低,弹性能积聚减弱。瞬变电磁与钻孔窥视证实裂隙有效发育,实现了顶板“强-硬”至“弱-碎”结构的可控转化。

关键词: 水力压裂, 坚硬顶板, 瞬变电磁, 冲击地压

Abstract:

To address the rock burst hazard induced by difficult caving of hard roof strata in gently inclined coal seams, this study proposes a hydraulic fracturing roof weakening technology, using the I010206 working face at Kuangou Coal Mine as an engineering case. Through theoretical analysis, numerical simulation, and field monitoring, fracturing parameters were optimized (borehole diameter: 133mm, injection pressure: 25MPa, flow rate: 40m3), employing a segmented hydraulic fracturing process with a double-packer single-clamp system. The results demonstrate that fracturing generates a complex fracture network dominated by horizontal fractures, with an effective radius of 15–30m, significantly compromising roof integrity. The periodic weighting interval of supports shortened to 10.4-11.6m, accompanied by reduced stress concentration coefficients and diminished elastic energy accumulation. Transient electromagnetic surveys and borehole imaging confirmed effective fracture development, achieving a controlled transformation of the roof structure from "strong-hard" to "weak-fragmented." This provides a theoretical foundation and technical support for preventing dynamic disasters in mines under similar geological conditions.

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