Abstract: Due to the surrounding rock condition of one thousand meters deep, thick coal seams and "three hard" in Fangshan Coal Mine of Henan Pingyu Coal & Electricity Co., Ltd, surrounding rock stress distribution law during drivage and deformation situation of tunnel after support were simulated by FLAC, analysis of risk of rock burst during tunnel excavation was done, stress concentration factor of vertical stress and horizontal stress of surrounding rock of tunnel was 1.8 and 1.56 under such conditions, shearing strength in offside of foursquare of tunnel was biggest.Deformation of surrounding rock of tunnel is small under the normal excavation, tunnel stress will double increase with rock burst risk under complex geological structures or subjected to impact of mining.

Key words: The condition of “three hard”, Numerical simulation, Stress analysis, Rock burst