Abstract: To minimize the construction safety hazards induced by the TBM (Tunnel Boring Machine) excavation in the unfavorable geological conditions, the application of the safety monitoring and the early warning technology of TBM construction in a hydraulic tunnel is studied in this paper. In view of the specific difficulties of the project, this paper adopts the monitoring scheme of steel plate meter to effectively perform the engineering safety early warning; The monitoring results indicated that the rare and the bottom of the shielded support did not meet the stability requirements of the tunnel cavities, and pretreatment techniques such as reinforcement of the surrounding rock mass were used to reduce the number of TBM jams and minimize hazards such as buried machines, which ensure the stability of the excavated spacing and the safety of crew and equipment.

Key words: TBM (Tunnel Boring Machine), Metamorphic Rock, Advanced Pretreatment, Monitoring Indices, Safety Monitoring, Early Warning Technology