Abstract: The risk prediction and emergency mitigations of the TBM excavation jamming have become the key control points for an efficient tunneling project. The service tunnel of the Tianshan Shengli Tunnel uses an open-type TBM for the excavation, and the tunnel passes through 16 faults, which poses a high risk of jamming the TBM. For the fault zones with potential jamming risks in the Tianshan Shengli Tunnel, a jamming prediction method based on the deformation prediction of fault zones and the TBM enlargement volume was established, and it was applied to the jamming prediction of the Tianshan Shengli Tunnel to analyze the degree of jamming risk in each fault. The effect of the grouting consolidation of fault zones was studied, it provides advanced reinforcement technology for the TBM tunnel. When the TBM needs to be released, chemical grouting, bracing with grouting pipes, detour tunnel, and tunnel excavation and unloading measures can take together to ensure a safe construction. By conducting the risk prediction before the TBM construction, take specific measures to the fractured zone of fault in tunnel, provide reinforcement measures during the construction. After the TBM is jammed, take reasonable mitigation measures, so that the TBM construction in the tunnel is safe and efficient.

Key words: TBM Jamming, Risk Prediction, Advance Reinforcement, TBM Jamming Release