ABSTRACT
The Bank-Monument station, located in the heart of London, is a key interchange served by five lines and is one of the most congested complexes within the London Underground (LU) network. The Bank Station Capacity Upgrade (BSCU) project aims to increase station capacity by 40%, including provision of step-free access from street level to Northern line level at ~30mBGL and Docklands Light Railway line level at ~40mBGL via a new shaft. The lower section of this shaft is squeezed between two existing segmental concrete lined tunnels that are 3.5m apart at the springline level. The shaft was designed using a hybrid method of sprayed concrete lining (SCL) and traditional hand-mining, maximising the benefits of both tunnelling construction methodologies commonly utilised in London Clay. This paper addresses challenges in the design and construction of the shaft, including numerical modelling predictions against monitoring data recorded during construction.
