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Abstract The old roof of Tangjiahui Mine 61207 working face with a giant thick fine sandstone, in order to realize the safe recovery of the working face, the deep-hole hydraulic fracturing technology of the roof was implemented for the first time in the working face cuttings and two roadways before recovery, which was used to hydraulically pre-fracture the old roof of the working face, artificially destroying the old roof and increasing the roof fracture or local roof fracture, so as to reduce the pressure step and strength of the working face and prevent the pressure frame accident. By adopting deep hole hydraulic fracturing measures, the workface avoided the fracture accident during the initial mining period and achieved the purpose of safe recovery of the workface during the initial roof release.
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