火车穿过一段地下铁道。

The train went through an underground railway.

地下铁道的修建减轻了地面交通的压力。

The construction of underground railways has eased traffic pressure on the ground.

盾构隧道。管片。地下铁道。现场试验。模型试验。设计荷载。

Shield Tunnel. Segment. Metro. Field test. Model test. Designing Load.

地下铁道工程时刻受到地下水的作用，防水问题不仅影响工程本身的坚固性和耐久性，而且直接影响到地下铁道的正常使用。

Subway engineering is often influenced by the underground water, therefore, the issue of waterproof decides the durability and sturdy of metro tunnel and the regular operation.