Data Analysis of Shield Tunnel Deformation from Real-Time Monitoring with Wireless Sensing Network

Abstract

As an important part of critical infrastructure, shield tunnel is widely used in urban area of China recent years. The safety of shield tunnel during construction and operation has drawn more and more attention. In the operational period, real time deformation monitoring is an effective way to help us to reveal the long-term deformation mechanism and control the lifetime safety of shield tunnel. Tilt sensors were installed in one interval shield tunnel in Shanghai Metro 2. From Oct 2015 to Feb 2017, monitoring data of inclination and temperature about nearly 500 days were collected at 20 min per acquisition. Kalman Filter has been used to reduce impact of temperature and vibration on the inclinations. The long-term measurement was stable and reliable. It should be noted that the long term deformation of shield tunnel is asymmetrical around the tunnel perimeter and related to the different leakage positions of tunnel segment. The influence of excavation caused by nearby construction can also be recognized by the real-time monitoring. In summary, the advantage of the monitoring system is its ability of real-time dynamic monitoring which may help us understand the long-term deformation mechanism and make a dynamic safety control.