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Coal Engineering ›› 2025, Vol. 57 ›› Issue (11): 64-73.doi: 10.11799/ce202511009

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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

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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