Abstract: In order to solve the problem of dust concentration exceeding the standard in fully mecha‐ nized excavation face of outburst coal seam in a coal mine and ensure normal production，based on the mechanism of rapid water injection in fully mechanized excavation face of outburst coal seam，the applica‐ tion of rapid water injection and dust reduction technology is carried out by field test method. The results show that the rapid water injection of the outburst coal seam implemented by the segmented expansion hole sealing device can realize the uniform wetting of the coal body at the full depth of the borehole through the segmented water injection，that is，the stress concentration zone is transferred to the deep part after the wa‐ ter injection in the front section，which provides a seepage channel for the water injection in the back sec‐ tion and effectively enhances the plasticity of the coal body. The technology can make full use of the exist‐ ing water exploration and drainage boreholes，arrange the water injection operation to be completed during the extension period of the belt，do not interfere with the normal production，and the segmented hole pack‐ er is easy to operate and the hole sealing is efficient. The field test verifies that under the parameters of wa‐ ter injection pressure of 12~14 MPa and water injection time of 2.5 h，the water injection volume of a sin‐ gle hole can reach 1.6 m3 ，and the wetting radius of coal seam can reach more than 1.5 m. After water in‐ jection，the dust concentration at the driver's position of the roadheader decreased from 2 396.7 mg/m3 to 907.7 mg/m3 ，and the dust reduction efficiency reached 62.1%，which significantly improved the working environment of the working face. The research proves that the rapid water injection and dust reduction tech‐ nology is suitable for the production demand of fully mechanized excavation face of outburst coal seam， and has good engineering promotion value.

Key words: outburst coal seam, fully mechanized excavation face, segmented expansion hole sealing device, water injection and dust reduction