Analysis of influence factor associated with rockbursts in deep, hard rock tunnels

Rockbursts in tunnels can be a significant hazard. Based on a large amount of micro-seismic information and hundreds of rockbursts that occurred in four deep headrace tunnels at a hydropower station in Sichuan province, China, we combined numerical calculation with micro-seismic monitoring in order to study the evolution processes of rockbursts. The achieved results are as follows: the excavation scheme, speed, and buried depth can affect the stability of the surrounding rocks in deep, hard-rock tunnels during construction. As the excavation step length, speed, and buried depth increase, the micro-seismic energy rises, and so do the frequency and intensity of rockbursts. The results can provide reasonable and scientific basis for prediction and prevention of rockbursts during underground tunnel excavation under high geostress.

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