Provided is a
coupling fracturing method for a
hard coal bed roof. A drilling
machine is utilized for drilling fracturing
drill holes inside the hard roof till the design position, specifically, each static fracturing guide
drill hole is formed between every two pulse hydraulic fracture
drill holes so as to form a fracturing
system; the fracture drill holes are connected to a pulse water
injection pump through an isometric flow
distributor with adjustable frequency, and the static fracturing drill holes are filled with static crushing agent
slurry; under the action of expansion force of the static crushing agent
slurry, initial cracks formed around the drill holes are monitored, released heat irradiates continuously towards the portions around the drill holes, a similarly elliptical temperature field is generated, and the elasticity modulus of a rock stratum is reduced; and under the action of hydraulic pressures of different frequencies, a
fracture zone, a fatigue zone and an original stress zone are formed in the positions, around the fracture drill holes, of the rock stratum, when pressure water flows to the rock stratum bearing heat conduction along the cracks, the water and
heat effect weakens the strength of the rock stratum, and the through time for crack zones among the drill holes is shortened. The method can sufficiently improve the
utilization rate of the drill holes, operation is easy, and construction is safe and reliable.