The effect of pore water pressure on structural performance of CERN concrete-lined tunnel
Osborne, John Andrew
Civil Engineering Research Association of Ireland
The European Centre for Nuclear research (CERN) operates the most powerful circular particle accelerator in a large-scale underground tunnel network of over 70 km. Even over four decades after construction, substantial cracks, water infiltration and structural deformation have still been developing with time based upon field observation and measurements. In particular, recent blockage of tunnel drainage system alters the hydraulic boundary condition and results in the development of pore-water pressure around the tunnel circumference, which in turn accelerates the tunnel deterioration and leakage. In this study, the development of pore water pressure and its effect on tunnel lining are investigated using 3D hydro-mechanical coupled finite element modelling. In the numerical simulation, particular emphasis is placed on the change of lining permeability and the drainage system with time. Results show that the pore water pressure on tunnel lining is significantly affected by the change of hydraulic condition, and consequently exacerbates the tunnel structural performance in the long term.
Ageing tunnel , Hydro-mechanical coupled analysis , Lining permeability , Pore water pressure , Lining performance
Xiao, Z., Osborne, J. A., Perez-Duenas, E. and Li, Z. (2020) ‘The effect of pore water pressure on structural performance of CERN concrete-lined tunnel’, in Ruane, K. and and Jaksic, V. (eds.) Civil Engineering Research in Ireland 2020: Conference Proceedings, Cork Institute of Technology 27-28 August, pp. 654-658. Available at: https://sword.cit.ie/monographs/1/ (Accessed: 15 March 2023)
© 2021, the Authors. All rights of papers in this publication rest with the authors. This publication is part of the proceedings of the Civil Engineering Research in Ireland conference held in conjunction with Irish Transportation Research Network conference at Cork Institute of Technology, Ireland on 27-28 August 2020.