Rapid Water Injection Technology in Extremely Thin Coal Seam Working Face

As the roof and floor of extremely thin coal seam affected largely by water, it is difficult to control the amount of water injection to the coal seam, which could easily lead to the poor working condition and affect safe production of working face. According to the study of water injection mechanism of thin coal seam working face and blasting mining technique, the rapid high-pressure water injection technology by blast hole was put forward, and the reasonable pressure, flow and water injection technique were determined. This way of water injection does not affect the production of working face and has good progress in both water injection and dustfall quantity through field test. The results show that the dedusting rate of total dust and respirable dust can be above 40% and 22% respectively.