为解决超大直径、超长距离、超高水压、超大埋深等复杂地层条件与高风险施工环境下水下公路盾构隧道施工技术难题，系统总结海太长江隧道在盾构设计、施工控制、结构建造与智能管理等方面的关键技术创新与实践。主要结论如下： 1）通过采用直径为8.6 m 的整体式重载主轴承（首次）、刀盘刀具智能监测、盾尾密封等核心技术，提升了超大断面盾构在超高水压、高磨蚀透水地层中超长距离施工安全的适应性与可靠性； 2）基于泥水劈裂模型试验与泥膜地层稳定理论分析，实现了强透水地层开挖面的动态稳定控制； 3）研发同步双液注浆、高效泥浆环流及组合式通风制冷技术，保障了超长距离施工的安全与效率； 4）应用高精度新型接头预埋连接件（DDCI）管片接头、整体式箱涵同步拼装、防火结构一体化烟道板等工业化建造技术，实现了结构毫米级精度安装与工序协同； 5）构建了以远程智能管控、智能焊接与数字孪生为核心的“云-边-端”协同建造体系，推动了隧道工程向智能化、工业化转型。

To address the technical challenges of underwater highway shield tunneling under complex geological conditions and highrisk construction scenarios characterized by ultra-large diameters, ultra-long distances, ultra-high water pressures, and large overburden depths, the authors systematically summarize the key technological innovations and engineering practices of the Haitai Yangtze River Tunnel in shield machine design, construction control, structural installation, and intelligent management. The main conclusions are as follows: (1) The applications of an 8.6 m-diameter monobloc heavy-duty main bearing, intelligent cutterhead tool monitoring, and multistage shield tail sealing technologies enhanced the adaptability and reliability of ultra-large cross-section shield machines for ultra-long-distance construction in ultra-high-water-pressure, highly abrasive and permeable strata; (2) Dynamic stability of the excavation face in highly permeable strata was achieved through slurry fracturing model tests and theoretical analysis of slurry membrane formation for ground stabilization; (3) Construction safety and efficiency for ultra-long-distance tunneling were ensured through the development of synchronous two-component grouting, efficient slurry circulation, and combined ventilation and cooling systems; (4) Millimeter-precision installation and process coordination were realized through industrialized construction technologies, including high-precision novel embedded joint connector (dual D-components+C-component+I-component, DDCI), integrated box-section gallery synchronous assembly, and structurally integrated fire-resistant smoke duct panels; (5) A cloud-edge-device collaborative construction system centered on remote intelligent control, intelligent welding, and digital twinning was established, promoting the intelligent and industrialized transformation of tunnel engineering.