Abstract
Rockburst is a common dynamic disaster induced by excavation activities in deep hard rock mines, where the rock structure is subjected to high geo-stress and dynamic disturbance simultaneously. In this paper, to simulate the actual stress condition of deep rock during mining operation, a series of impact tests were conducted on axially pre-stressed rock by using a self-developed coupled static-dynamic loading system. The failure characteristics were obtained. The rockburst mechanism was revealed. Test results indicate that both geo-stress and dynamic disturbance play important roles in controlling the occurrence of rockburst. Rockburst never happens when the rock is free of geostress. However, for the pre-stressed rock, rockburst will occur only if the disturbance energy exceeds a threshold value, which called threshold energy. As geo-stress increases, the energy threshold of rockburst is gradually reduced. This can interpret the in-situ observation that the frequency of rockburst is much higher in deeper mines.
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