The paper introduces the experience and understandings of the third party monitoring obtained in the practice of Guangzhou metroshield tunneling, which can be taken for reference by similar projects.
文章介绍了广州地铁盾构隧道施工过程中的第三方监测的经验和体会，可供同类工程施工中借鉴。
2
Early in the morning, in the Yongan subway station in Beijing, China's first subway line - Beijing Metro line 1 successfully established the first shield door.
清晨，在永安地铁站，中国的第一条地铁线路-北京地铁1号线成功地建立了第一个屏蔽门。
3
NATM and shield driven method are two main kinds of underground excavation construction methods in urban metro works.