School of Civil Engineering and the Environment, University of Southampton, United Kingdom; Jones and Wagener, Rivonia, South Africa; Mott MacDonald Ltd., Croydon, United Kingdom
Clayton, C.R.I., School of Civil Engineering and the Environment, University of Southampton, United Kingdom; Van Der Berg, J.P., Jones and Wagener, Rivonia, South Africa; Thomas, A.H., Mott MacDonald Ltd., Croydon, United Kingdom
A wide variety of instrumentation was deployed during the construction of the sprayed-concrete lined tunnels at Heathrow Express Terminal 4 station. This paper presents data from the in-tunnel displacement monitoring system and for settlements above the tunnels, providing data on instrument survival and performance, and an overall summary of the displacements arising from tunnel excavation.