藏日拉隧道穿越冰碛体掌子面发生溜坍原因分析及处治措施

以青藏高原拉林铁路藏日拉隧道为工程背景，针对该隧道穿越冰碛体开挖过程中引发溜坍的问题，采用现场地质勘探、加固措施和监控量测等手段，对溜坍的原因进行分析，并提出处治措施。结果表明:按照拟定的处治方案施工后，溜坍体得到了有效固结，隧道洞室处于稳定状态。

Reason Analysis and Treatment Measures for the Slip Collapse of Zangrila Tunnel crossing Moraine Body

Based on Zangrila Tunnel of Nyingchi-Lhasa Railway in Qinghai-Tibet Plateau, the reason of collapse is analyzed and the treatment measures are put forward based on the slip collapse occurred during the excavation of the tunnel crossing the moraine body by adopting the means of site geological exploration, reinforcement and monitoring and measuring, etc. The results show that the slip collapse body is effectively consolidated and the tunnel cavities are stable after the construction as per the prepared treatment proposal.