Abstract: In this paper, by using ANSYS software, the stress of surrounding rock and displacement of coal mass in different roadway models after punching were analyzed comprehensively. Additionally, it was determined that the high-pressure water jet punching position should be 2/7 or so from the roadway floor, and the aperture size should be 4/15 or so of the roadway floor length. Thus, the fissures in roadway surrounding rock may develop fully, and the rock integrity can be maintained, which is beneficial to speed up the face driving. Field test has verified that renmant gas qunatity in coal seam after high-pressure water jet punching has reduced significantly, the fluctuation of electromagnetic radiation intensity in surronding rock is large, and the hole wall is deformed after punching. This shows that the fissure development in coal mass after punching, expands the gas release range around slots, reduces the gas pressure gradient of outburst coal seam, and eliminates the outburst risk.

Key words: high-pressure water jet, punching, coal and gas outburst, numerical simulation