高海拔地区岩爆隧道关键施工技术

Key construction technology of rock burst tunnels in high altitude area

高海拔地区隧道一般具有埋深较大、地质构造活跃、地应力高等特点,隧道开挖后极容易发生岩爆现象,造成人员伤亡和机械损失,给施工带来不利。针对桑珠岭隧道的岩爆特征,依据初始应力场,对岩爆从总体、分阶段、初始应力场二次反演等方面进行预测,根据预测结果,提前采取系列技术措施,有效地降低了岩爆发生概率、破坏程度和施工风险,确保了施工安全。

The tunnels in high altitude area are generally deeply buried with active geological structures and high ground stress,and the occurrence of rock burst happens easily after the excavation of the tunnel,which is very likely to cause personal injury and mechanical damage and will adversely affect the safety construction. In view of the rock burst characteristics of Sangzhuling tunnel and based on the initial stress field,the rock burst is predicted totally,by stages and by quadratic inversion of initial stress field. A series of technical measures are adopted in advance to effectively reduce the rock burst probability,damage degree and constriuction risks,and the construction safety is ensured.