Abstract
Hydraulic fracturing technology is an effective means of changing the structure of coal and rock, which is a key issue in solving the technical problem of coal mine. The technology can not only change the structure of the coal and rock mass, reduce the pressure on the hard roof, reduce the concentration of coal dust, protect the working environment, increase the natural ignition cycle, and avoid fire accidents, but can also prevent any residual material from polluting the groundwater and soil during excavation. In this paper, the effects of the water injection parameters and fracture inclination angle on hydraulic fracturing are firstly studied by numerical simulation, before hydraulic fracturing on the hard roof is subjected to a field test. The results show that the cracking effect is obvious, the hard roof pressure and coal dust concentration are reduced.
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