ABSTRACT Under complex deep mining conditions, crosscuts adjacent to goafs often face severe surrounding rock stability issues due to the hanging of hard roofs and mining disturbances. Taking the large deformation of the 261 cross‐cut at Huoshaopu Coal Mine as an example, hydraulic fracturing for roof cutting and pressure relief was applied for control. Through integrated field observation, theoretical modeling, numerical simulation, and engineering practice, it was found that the depth of roof fractures reached 6.23 m, with an integrity coefficient as low as 0.4–0.5. A cantilever beam model was established and stress formulas were derived, while UDEC simulations verified the effectiveness of hydraulic fracturing in cutting off the roof and redistributing stress. On‐site implementation of bolt‐grouting reinforcement combined with the “retreat‐style single‐borehole multi‐stage fracturing” technique successfully severed the main roof cantilever, leading to a significant reduction in abutment pressure: coal pillar stress decreased from 39.35 to 32.35 MPa (a reduction of 17.8%), and solid coal side stress decreased from 31.05 to 27.02 MPa (a reduction of 13.0%). Roadway convergence rates were reduced by 28%–38% without any collapse. The study demonstrates that hydraulic fracturing is an effective method for mitigating stress and deformation in crosscuts, providing a critical engineering strategy for controlling thick and hard roof strata.
Xuewu et al. (Wed,) studied this question.
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