Practice of Coal Wall Water Injection Technology in Caving of Roof Coal with HDY-H-type Support

Water injection in coal seams is one of the most important dust prevention measures in the coal face.Pre-drilling many boreholes before mining,the pressure water is injected into coal seams through these boreholes,the pressure water seeps into coal bodies along the bedding,joint and fracture of the coal seam,the coal water content is increased.The source of coal dust is fundamentally solved. Thus the production quantity of dust in coal mining is reduced and lowered.The con centration of dust in air is reduced.The workplace environment conditions are improved.It is conducive to the workers health.Water injection in coal seams with short wall drilling is one of the important measures that solve the coal dust in coal face.