The author focuse on the great challenges encountered during the tunneling process in the Wuhan Sanyang Road Tunnel, and the key techniques adopted to solve those problems. When tunneling in composite strata, engineers inevitably face problems such as inefficient excavation, excessive tool wear, excavation face instability and the risk of clogging. The TBM used in the project allows tool change under atmospheric pressure, which improves the efficiency of tool change and eliminated the risk of casualties during hyperbaric interventions. In terms of the tool wear and clogging, the authors propose technical solutions as follows: the optimization of the tool′s type and configuration, improvement of the central flushing system and chemical dissolution of clogging. The results indicate that through the countermeasures proposed, the tunneling efficiency can be improved effectively. They also reduce the cutter change frequency and eliminate the risk of TBM downtime. The technical achievements obtained in the construction of the Wuhan Sanyang Road Tunnel can provide technical reference for the construction of largediameter shield tunnels in composite strata in the future.

为解决三阳路隧道在施工过程中掘进低效、刀具磨损、正面失稳、泥饼淤积等问题，提出新的关键技术： 1）引进的盾构设备采用常压换刀技术，提高刀具的更换效率，同时，降低在高压条件下更换刀具的安全风险； 2）针对刀具磨损、刀盘结泥饼等问题，研究提出刀具形式与配置优化、中心冲刷系统改制、化学除泥饼等技术方案。研究表明，通过采用上述关键技术，可以有效提高掘进效率，降低换刀频率，减少停机风险。武汉三阳路隧道建设所取得的技术成果，可为未来复合地层大直径盾构施工提供技术参考。