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Although timber structures have been extensively used in underground temporary supportingsystem, their actual performance is poorly understood, resulting in potentially conservative andover-engineered design. In this paper, a novel wireless sensor technology, SmartPlank, is introduced tomonitor the field performance of timber structures during underground construction. It consists of a woodenbeam equipped with a streamlined wireless sensor node, two thin foil strain gauges and two temperaturesensors, which enables to measure the strain and temperature at two sides of the beam, and to transmit thisinformation in real-time over an IPv6 (6LowPan) multi-hop wireless mesh network and Internet. FourSmartPlanks were deployed at the London Underground’s Tottenham Court Road (TCR) stationredevelopment site during the Stair 14 excavation, together with seven relay nodes and a gateway. Themonitoring started from August 2013, and will last for one and a half years until the Central Line possessionin 2015. This paper reports both the short-term and long-term performances of the monitored timberstructures. The grouting effect on the short-term performance of timber structures is highlighted; the groutinjection process creates a large downward pressure on the top surface of the SmartPlank. The short and longterm earth pressures applied to the monitored structures are estimated from the measured strains, and theestimated values are compared to the design loads.

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