研究结论:通过两阶段岩爆预测可知,较之施工前岩爆预测情况,在实际条件下,轻微岩爆区长度将减少,中等岩爆区则基本相当,岩爆基本发生在边墙部位;卢森判据的结论更加适合本隧道岩爆的预测,前期研究中获取的隧道区内构造应力场较为准确,采用理论与现场实测的研究手段,结合两阶段岩爆预测模式,准确预测了掌子面前方一定范围内岩爆发生状况,为岩爆预测提供了切实可行的方法。

Research conclusions:From the prediction of rock outburst in two phases, it is known that compared with the state in the pas,t the length ofslightrock outburstareawas reduced, but the length ofmedium rock outburstareawas almost the same, and generally the rock outbursthappens in the side wall of tunne.l Therefore, criterion ofRussense is the most suitable toCangling Tunne,l and the stress of internal structure in the tunnel obtained from the research in the early -stage is comparatively accurate. With the means of theoretic analysis and real test and combined with the prediction mode for rock outburstin two phases, the rock outburstin certain area in frontof theworking face ispredicted correctly.Thismethod is feasible forpredicting the rock outburst.