Abstract Water ingress into a mined tunnel can be an issue – not just for construction but also for depressurisation and the potential consequential surface settlement. The Waterview Connection in Auckland has twin ~14.5m diameter TBM tunnels linked by 16 mined cross passages. Each cross…
Abstract The NZ Transport Agency’s Waterview Connection project involves the construction of 5 km of motorway to complete Auckland’s Western Ring Route. Half of this new link is twin 14.5 m diameter tunnels constructed by Tunnel Boring Machine with 16 sequentially excavated cross-passages. Over most…
Abstract Tunnel boring machine (TBM) penetration tests entail incrementally increasing TBM thrust from full stop to maximum speed and recording the penetration rate either at set thrust levels or at set times. TBM penetration test data can be analysed by plotting the penetration rate (distance/revolution)…
This short course comprises two topics. Unsaturated Soils The course presents a summary of modern unsaturated soil mechanics. It introduces the fundamental concepts required for describing the behaviour of unsaturated soils followed by an account of the main features of their mechanical and hydraulic behaviour….