上跨既有地铁线深基坑工程变形控制措施研究

A Study of Deformation Control Measures of Deep Foundation Pit Engineering cross Existing Metro Line

在既有地铁隧道邻近位置或上方进行基坑开挖,容易导致地铁隧道变形,从而对其使用功能和安全性产生严重影响.结合具体工程实例,从基坑设计、坑底地基加固、施工控制和信息化施工监测4个方面采取措施控制地铁隧道的变形,保护隧道基坑及地铁隧道的安全.监测结果表明,监测数据均在监测控制限值内,对既有地铁隧道起到有效保护.设计、施工措施及监测数据可供类似工程参考.

Excavating foundation pits adjacent to or above existing subway tunnels is likely to cause subway tunneldeformation, exerting severe influences on tunnels, functioning and safety. Some approaches are used to control thedeformation of subway tunnels and ensure the safety of foundation pits and foundation pit design, foundation reinforcement, construction control and information construction monitoring. Themonitoring results show that data of monitoring items are all within the monitoring control limits, and thus playing aneffective part in protecting the existing subway tunnels. Accordingly, the design, construction measures and monitoringdata can provide implications for similar engineering projects.