Advanced models for stress evaluation and safety assessment in steel-lined pressure tunnels

An accurate estimation of the stress in a steel liner is required for the design of steel-lined pressure shafts, both with regard to safety assessment of ageing steel-lined waterways of hydropower plants built in the 20th century, and for new projects which may be subject to harsher operational conditions. This paper proposes some new considerations for enhancing the standard calculation model, developed by the authors in the scope of practical engineering needs, by introducing more complexity.