Abstract: In order to study influence of groove curvature in lower reaches on slurry's movement characteristics after tailing dam break, dam break process was simulated and experimented at different bending degrees (30, 60, 90°) of grooves by adopting independently developed physical model test device, and changes of submerged elevation, impact force and flow velocity of outburst slurry were analyzed. The results show that when groove curvature increases, submerged elevation of slurry at curved section will increase non-linearly in an overall "small-large-small" trend. After slurry flows through bend, its impact force will decrease in a "cliff-like" form at bending section, and the larger bending degree is, the larger reduction will be. Flow velocity of slurry is negatively correlated with groove curvature, and the larger curvature is, the smaller it will be after the bend.

Key words: tailing dam break, slurry movement, groove curvature, movement characteristics, similarity simulation test