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| Practice of hydraulic fracturing and top cutting pressure relief technology for hard roof |
| Yang Hongzeng1，2，3，4 |
| 1. Hebei Coal Research Institute CO. LTD., Xingtai 054000, China; 2. National Energy Key Laboratory of Backfilling Mining Technology, Xingtai 054000, China; 3. Hebei Backfilling Mining Technology Co., Ltd, Xingtai 054000, China; 4. Hebei Innovation Center of Backfilling Coal Mining Technology, Xingtai 054000 |
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Abstract In order to promote the timely collapse of the roof in the goaf of No.2 Coal Seam in Xingdong Mine, the research on roof cutting and pressure relief technology was carried out in No.2129 Face. On the basis of comparing different pressure relief methods, hydraulic fracturing top cutting pressure relief was determined. The mechanism of hydraulic fracturing top cutting was analyzed. Through theoretical calculation, the main parameters of hydraulic fracturing such as water injection pressure, top cutting height and borehole layout were determined. The field application showed that after hydraulic fracturing roof cutting was adopted in No.2129 Face, the periodic pressure step and pressure intensity were reduced, the roadway deformation was significantly reduced, the coal wall slope was significantly improved, and the ideal pressure relief effect was achieved, which provided a reference for the control of hard roof under similar conditions.
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