针对高水压强渗透地层中超大直径盾构江底对接所面临的技术挑战，以江阴靖江长江隧道工程为背景，提出盾构隧道地中对接技术区段划分理念，构建对接施工全过程技术路径，并围绕该技术路径实施过程中的核心难题，提出相应的技术措施。1）通过盾体纵环肋复合加固与过渡段管片拉结技术，保障停机与拆解阶段的结构安全； 2）建立基于响应评估模型的微扰动掘进控制体系，实现对先行盾构及隧道结构的动态保护； 3）融合精密测量与智能纠偏技术，形成高精度对接控制方法，成功实现水平趋向差值0 mm、竖向趋向差值2 mm的精准对接； 4）研发注浆-冻结协同的复合加固工艺，构建抗渗稳定的作业环境； 5）提出核心段模块化拆解与分级卸载工艺，解决洞内大吨位部件安全移除难题； 6）提出“2期施工+3层结构”的合龙段钢壳混凝土结构设计施工方法，兼顾承载能力和施工便利性。该系列技术在江阴靖江长江隧道工程中得到成功应用，施工完成后测得隧道贯通水平偏差1.2 mm，竖向偏差3.2 mm，管片水平最大位移1.5 mm，盾体最大融沉量12.61 mm，施工过程安全可控。
With the rapid development of underwater tunnel construction, underground shield docking has become a key technology for realizing long-distance tunneling in complex strata. A case study on the Jiangyin-Jingjiang Yangtze River Tunnel Project is conducted to address the technical challenges faced by docking super-large-diameter shields at the riverbed under high water pressure and strongly permeable sandy strata. A full-process technical path for docking is established based on the concept of dividing the shield docking technology zone. To address the core challenges during the implementation of this technical path, the following technical measures are proposed. The composite reinforcement of the shield body with longitudinal and circumferential ribs, together with segment tieback technology in the transition zone, ensures structural safety during shield stoppage and dismantling. Furthermore, a micro-disturbance tunneling control system based on a response evaluation model is established, enabling the dynamic protection of the leading structure by the trailing shield. A high-precision docking control method is developed by integrating precision measurement and intelligent deviation correction technology, which achieves precise docking with a horizontal trend different of 0 mm and a vertical trend different of 2 mm. A composite reinforcement process combining grouting and freezing creates a stable and impermeable working environment. Furthermore, the modular dismantling and graded unloading of the core section enable the safe removal of large-tonnage components within the tunnel. Finally, a convenient two-phase construction and three-layer steel plate approach is used to construct the steel-shell-concrete structure of the closure section, which exhibits sufficient bearing capacity. This series of technologies is successfully applied in the Jiangyin-Jingjiang Yangtze River Tunnel Project. After construction, the maximum horizontal deviation of the tunnel breakthrough is 1.2 mm, the vertical deviation is 3.2 mm, the maximum segment horizontal displacement is 1.5 mm, and the maximum shield thaw settlement is 12.61 mm. The construction process is safe and controllable, providing a complete technical system and a practical example of underground shield tunnel docking under similar conditions.
