Abstract: The occurrence intensity and damage degree of rock burst occurred in roadway floor of underground coal mines becomes more serious as the mining depth increases in China. In this paper, the inducement mechanism of floor burst was analyzed, and the corresponding control principle was put forward, that is, the burst-inducing condition was decreased by changing the bending strength of roadway floor. Additionally, FLAC3D was adopted to simulate and compare the pressure-relief effects of different control measures implemented in coal-floor roadway and rock-floor roadway, respectively. The results show that the pressure-relief effect of the control method by combination of large-diameter borehole and pressure-releasing groove on coal-floor roadway is more effective, while the combination of large-diameter borehole and releving shot on rock-floor roadway can achieve better pressure-relief effect. The research results in this paper can provide theoretical reference for floor burst control in underground mining.

Key words: floor burst, pressure-releasing groove, large-diameter borehole, coal-floor roadway, rock-floor roadway