On blasting perturbation mechanism of rock burst in tunnel by dynamic photo-elasticity

The model was simulated by photo-elastic experiments according to the Lamb model, which included the propagation, interaction laws and interception effects of slot obstacle. The experimental results accord with the kinetics mostly: (1) There are P, S and Rayleigh waves under the action of oblique impact load. Only P and Rayleigh waves contribute to rock burst. (2) From the fringe patterns, the effects of inducing fracture and laws of propagation about pressure and Rayleigh are important factors for rock-burst mechanism, which can explain the space relationship between rock burst and face. (3) The slot on the model surface can effectively intercept stress waves, especially Rayleigh waves. So the method for controlling rock-burst is theoretically feasible.