The rockburst records of many underground projects indicate that the static load theory has apparent limitation in the analysis of rockburst mechanism, as rockburst is closely related to explosion, when the elastic wave especially Rayleigh wave generated by explosion has remarkable disturbance effects on the surrounding rocks. Based on the elastic wave theory and fracture mechanics, the FEM simulations are carred out to study the propagation of the micro-cracks within the rock mass surrounding the tunnel under the conditions of Rayleigh wave effect.. The stress intensity factor of the micro-crack tip is acquired via the numerical extrapolation method at the displacement of nodes. The calculation results indicate that elastic wave is able to lead to the instantaneous augment of the winged crack tip stress intensity factor as well as the deflection of the crack propagation direction.
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