Rock burst dangerous area coal seam floor fracture water injection method

The invention relates to a rock burst dangerous area coal seam floor fracture water injection method which effectively achieves blasting fracture of a roadway floor with bottom coal left and injects water into the roadway floor subjected to blasting fracture by injecting a pipe to prevent accidents and ensure the coal mine production safety. The method includes determining the bottom coal leavingthickness of a mining face roadway, adopting the floor pressure relief and implementing floor blasting fracture and floor pipe insertion and water injection; drilling holes in the floor subjected to the blasting fracture according to the lag head-on distance during fully-mechanized excavating of a weak impact dangerous section on the mining face and the roadway bottom coal thickness containing thecoal gangue layer, and drilling pressure relief blasting holes and water injection holes alternatively in the roadway floor in the roadway direction; inserting pipes in the holes and injecting water;determining the water cont