Numerical simulation of strainbursts using a novel initiation method

Numerical simulation of rockbursts remains a challenge due to the inherent difficulties in dynamic failure simulation. A novel distinct-element bonded block method is proposed and tested to simulate strainbursts. The method simulates the generation of a seismic event induced by dynamic rock cracking. The seismic event produces P- and S-waves with seismic wave properties including velocity, the ratio of Vs/Vp, and frequency that are expected for strainbursts. In this manner, the process of strainbursting by dynamic fracture processes is successfully captured. The simulations suggest that a critical stress level may exist beyond which a minor disturbance can induce strainbursts.