ABSTRACT
Line C is the third line of the Rome underground system. The T3 stretch is presently under construction: it runs for a length of about 2.8 km right underneath the historic city center of Rome. Two EPB TBMs with a 6.70 m cut diameter are being used to excavate the tunnels at a depth between 30 and 60 m below the ground level. Strain and temperature measurements have been acquired to collect data in continuous mode, starting from the early curing stages. Wireless and low power consumption data-loggers and vibrating wire strain gauges, both embedded in each segment of the instrumented ring, allow remote monitoring of all the main events in the TBM lining, without any interference with the ordinary underground activities. In order to check the strain behavior of the lining, single instrumented precast segments were tested through special full-scale loading tests.
