Function of reinforcement in concrete tunnel linings

An investigation has been carried out on the behaviour and performance of different concrete tunnel lining systems. The reinforcement requirements for their typical structural load-bearing systems have been analysed. Traditional design methods can underestimate the potential of a tunnel lining system when the models ignore parts of the boundary conditions. Experimental investigations have been carried out to provide data to improve the models and to yield more economic designs. The results of the experimental testing program and the academic research demonstrate that in many cases, moderate dose rates of fibre reinforcement can provide the required structural ductility, robustness and safety of tunnel linings while reducing construction cost and time.