Single shell linings design

Description

Design optimizations of tunnel linings, especially the use of single shell linings instead of double shell linings, aim to reduce construction time and costs. The reduction of construction material (concrete and steel) required for the tunnel support as well as less transportation volume all eventually result in increased sustainable benefits and in lower carbon footprints. The Brenner Base Tunnel is taken as an example therefor. It is a railway tunnel between Austria and Italy through the Alps with a length of 64 km. The construction lot “Tulfes-Pfons” includes 38 km of tunnel excavation work and consists of several structures such as the 9 km long “Tulfes emergency tunnel”. An emergency tunnel as this service (non-public) tunnel does not necessarily require a tunnel lining system with two shells, but under certain boundary conditions can be achieved by a single shell lining approach. The required conditions and limitations for the single lining approach are reflected and a proposal for structural verification is provided. For verification approach a novel constitutive model for the shotcrete design is used.

Period	11 Dec 2019
Held at	Underground Tunnelling for Substation Construction
Event type	Course
Location	Selangor, Malaysia
Degree of Recognition	National