NUMERICAL SIMULATION OF INSTABLE FAILURE OF DEEP ROCK TUNNEL TRIGGERED BY DYNAMIC DISTURBANCE
动态扰动触发深部巷道发生失稳破裂的数值模拟

The dynamic disturbance may trigger the instable failure of rock mass when the high elastic strain energy is accumulated in the deep underground rock mass; and in turn it leads to occurrence of rockbursts. By considering the effect of different lateral pressure coefficients, the failure process of deep rock tunnels, which is triggered by dynamic disturbance, is simulated in order to clarify the failure mechanisms of tunnels at depth. The numerical results indicate that the triggering action of dynamic disturbances is closely pertinent to the static in-situ stress condition and the waveforms of the dynamic disturbance. In general, it brings about greater influences on the stability of underground tunnels with the increasing magnitude and with the prolonged duration of dynamic disturbance. Therefore, it is of theroetical and practical significance to investigate the effect of dynamic disturbance on the stability of underground tunnels.