中文摘要：

南京长江隧道采用直径为14.93 m的泥水盾构施工,在长达3 020 m的盾构段施工中,成功穿越水压高达0.65 MPa的江底砾砂等高渗透性地层,完成在江底带压开舱、穿越江中超浅覆土段等高难度的工作,是我国迄今为止在长江上修建的风险最大的大型越江隧道。从分析南京长江隧道施工中面临的重要的工程难点出发,并结合现场的具体情况,系统地总结南京长江隧道施工中的泥浆成膜、带压开舱等关键技术,对我国大直径泥水盾构技术的发展具有重要的参考意义。

英文摘要：

Nanjing Yangtze River tunnel was constructed by slurry shield with diameter of 14.93 m. Along the 3 020 m tunnel, a highly permeable gravel stratum under water pressure of 0.65 MPa was passed through successfully. In the project, the most difficult tunnel with giant size across the Yangtze River, several construction difficulties were overcome, such as opening chamber under high pressure and under-passing the section of super shallow cover under the Yangtze River. Based on conditions of the site, difficulties faced with the project were analyzed and key technologies including filter cake formation and opening chamber under pressure were summarized systematically. These achievements would play a significant role in developing the technology of slurry shield with large size in China.