— May 2019
Assessment of the impact on existing cast-iron and precast concrete tunnel linings (in total approximately 300 assets.) including empirical and finite element calculations.
Bank Station is a London Underground station located in the City of London financial district. It is a key interchange served by five existing lines. The Bank Station Capacity Upgrade (BSCU) comprises the construction of new tunnels adjacent to and connecting with the existing tunnels. A staged, risk-based approach was used to efficiently assess the affected existing assets and determine an appropriate mitigation and monitoring scheme. Empirical methods and complex numerical models were used at the different stages of the assessment, to understand the risk to the existing railway and how they could best be managed while minimizing disruption to the station and its users.
The geology comprises London Clay formation overlain by Quaternary superficial deposits comprising river terrace deposits and alluvium which are generally overlain by made ground.