Real-time safety monitoring on existing metro station underpassed by new metro

As more and more metros were built in modern city, the new constructing metro lines will be inevitably crossing the existing one. During the construction process of the new metro line, excavation may lead to the displacement of the existing tunnels and the tracks, sequentially affect the travel of trains, so monitoring on the new constructing lines is very important. The traditional manual monitoring techniques can be not available due to the busy traffic. Therefore, automatic remote real-time monitoring system should be applied to supervise the deformation of structures and tracks of existing metro 24-hours/7 days. During the construction of new metro station under-pass a existing station in Beijing, DAMS-IV intelligent distributed safety monitoring system was adopted, 84 hydro-static levelings and other instruments were installed to monitor the exiting station structures and the tracks; The observed data do help to adjust the construction plan and grouting strength to make sure that the deformation of the existing station and tracks was under control.