To address the frequency of rock burst in hard coal seam mining, the 4# coal seam of Hujiahe Coal Mine is taken as the engineering background, a mechanical model of rock burst pressure is constructed through theoretical research to further improve the weakening mechanism and instability criterion of coal body. FLAC3D numerical simulation was adopted to compare the stress evolution law of stope and coal pillar before and after drilling jet slotting, and a high-hardness coal seam slotting process of “fixed-point impact+slow rotation” was proposed. The results of research show that the ultra-high pressure hydraulic slotting technology can effectively prevent and control the rock burst disaster of strong impact hard coal seam through the dual role of static load relief and dynamic load shielding. Slotting pressure relief can significantly reduce the static load stress and elastic energy accumulation of coal seam; the regular slot structure can make the coal part lose the bearing capacity, and effectively shielding and blocking the propagation of dynamic load stress wave. The frequency, average energy and energy per unit footage of microseismic events above 1 000 J are reduced by 22%, 18% and 37%, respectively, due to the borehole jet slotting and pressure relief technology. The research conclusion provides a reference for the prevention and control of mine rock burst under similar conditions.
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