Effect of layered joints on rockburst in deep tunnels

• DOI: 10.1007/s40789-022-00489-x
• Publication Date: 2022-04-05T09:02:36Z
• Authors: Mingming He; Jinrui Zhao; Bianyuan Deng; Zhiqiang Zhang
• Keywords: Intensity

Abstract The existence of joints in the surrounding rock mass has a considerable effect on tunnel rockbursts. Herein, we studied layered with different inclination angles and spacings rockburst deep tunnels investigated failure area, deformation process mass, stress change inside velocity failed rock, kinetic energy failure. type can thus be determined. results showed that intensity increases as quality designation (RQD) decreases, while rate first then decreases. exhibits turning point between RQD = 50 70, below which gradually ultimately ceasing to rockburst. Rockburst always occurs perpendicular direction joint. When σ x y , joint angle changes from 45° 90°, decreases (from 60°), 60° 90°). combined evolution law strain energy, divided into four stages.