Title: Segmental Lining Design using Macro Synthetic Fibre Reinforcement
Author(s): Winterberg, R.; Rodrìguez, L.M.; Cámara, R.J.; Abad, D.S
Publication: Symposium Paper
Appears on pages(s): 133-142
Keywords: Macro synthetic fibre, fibre reinforced concrete, segmental lining, TBM, segment design
Fibre reinforced concrete (FRC) is becoming widely utilized in segmental linings due to
the improved mechanical performance, robustness and durability of the segments. Further,
significant cost savings can be achieved in segment production and by reduced repair rates
during temporary loading conditions. The replacement of traditional rebar cages with fibres
further allows changing a crack control governed design to a purely structural design with
more freedom in detailing.
Macro synthetic fibres (MSF) are non-corrosive and thus ideal for segmental linings in
critical environments. Although fibre reinforcement for segments is relatively new, recent
publications such as the ITAtech “Guidance for precast FRC segments – Volume 1: Design
aspects” or the British PAS 8810 “Tunnel design – Design of concrete segmental tunnel
linings – Code of practice” have now given more credibility to this reinforcement type and the
basis for design.
This paper presents and discusses the design methodology for precast tunnel segments and
in particular the tasks associated with the use of MSF reinforcement. Temporary loadings as
well as long term load behaviour will be addressed. A case history from the Santoña–Laredo
General Interceptor Collector, currently under construction in northern Spain, will illustrate
the specific benefits of MSF reinforcement for segmental linings.