Abstract:

Highspeed railway tunnel in northern Wuyi mountain is a single hole bidirectional tunnel, and the maximum depth of the tunnel is as deep as 1 100 m, so it belongs to high stress area. It may appear weak rockburst according to the study on the rockburse tendency. In this paper, researchers used microseismic monitoring technology to monitor the number of events and the change of energy, in order to forecast rockburst and spalling which can prevent injuries and equipment damage. According to the rule that when the event rate and energy rate increase violently, the possibility of rockburst becomes easy due to the violent change in the inside of rock, researchers forecast a small rockburst successfully. Study resutls are as follows: 1) The characteristics of common microseismic wave form in tunnel construction are summarized. 2) T fact that event rate and energy rate can objectively reflect the rapid changes of rock mass is testified. This is significant for the tunnels and other underground engineering.

Key words: rockburst, microseismic monitoring, warning, tunnel