现代交通与冶金材料

盾构管片作为隧道承压的主体，决定了整个隧道工程的建设质量，但随着盾构管片直径、厚度不断加大，其在蒸汽养护制备工艺下更容易发生开裂，对隧道的结构安全造成潜在威胁。本文依托江阴靖江长江隧道工程，采用多场耦合模型定量评估了超大直径盾构管片开裂风险。研究表明，管片开裂风险主要来自于表面与环境的温差、内外温差产生的温度梯度，通过降低管片绝热温升、降低蒸汽养护温度或者掺加纳米C-S-H晶核进行免蒸汽养护，可大幅降低超大直径管片在预制过程中的开裂风险。本研究为江阴靖江长江隧道工程的高性能盾构管片制备提供理论依据，也为中国将来高水压大直径盾构隧道建设提供技术储备。

As the primary load-bearing component of tunnels, the shield segment critically influences the overall construction quality of tunnel projects. However, with the continual increase of diameter and thickness, these segments are becoming more susceptible to cracking during steam curing, posing a potential threat to the structural safety of tunnel. Based on the Jiangyin–Jingjiang Yangtze River Tunnel project, a multi-field coupling model is employed in this study to quantitatively assess the cracking risk of ultra-large diameter shield segments. The results show that the cracking risk of segments mainly comes from the temperature difference between the surface and the environment and between the inside and outside. The cracking risk can be significantly reduced by implementing the following measures, namely, reducing the adiabatic temperature rise of the segments, reducing the steam curing temperature, or incorporating nano C-S-H crystal seed. The study provides a theoretical foundation for producing high-performance shield segments for the Jiangyin–Jingjiang Yangtze River Tunnel project and contributes to the technical expertise required for future construction of ultra-large-diameter shield tunnels under high water pressure in China.