Abstract： Coal seam water injection is an important measure of comprehensive dust prevention in coal mine. In order to reduce the coal dust in the working place and provide a good working environment for the underground workers, it is necessary to inject water into the coal seam construction drilling. The effect of water injection needs to consider many factors : water injection time, water injection pressure, wetting radius, sealing length, sealing effect and so on. In order to better determine the wetting radius of coal seam water injection in coal mining face and provide a reliable basis for the parameter design of coal seam water injection drilling, this paper carried out coal seam water injection test on the actual mining face of the mine. Dynamic pressure and static pressure water injection tests were carried out to determine the wetting radius of coal seam water injection, and to provide design basis for the construction parameters of coal seam water injection drilling.
