DOI: 10.11799/ce202511009
Research and application of hydraulic fracturing weakening mechanism for hard roof of gently inclined coal seams
YANG Xu
ZHANG Jian
ZHENG Sanlong
DAI Nan
CUI Feng
LIU Hao
LI Hongping
WANG Zeyang
WANG Haojie
Abstract：To address the rock burst hazard induced by difficult caving of hard roof strata in gently inclined coal seams,we proposed a hydraulic fracturing roof weakening technology,taking 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:133 mm,injection pressure:25 MPa,flow rate:40 m3),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 15～30 m,significantly compromising roof integrity.The periodic weighting interval of supports shortened to 10.4～11.6 m,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".
Keywords：hydraulic fracturinghard rooftransient electromagneticrock burst
Publication Date：2025-11-20
Online Publishing Date：2026-01-15(First online date of this platform, not the publication date of the document)
Pages：10( 64-73 )