A large excavation at the New British Library

Outlines the methods used to construct two basements at the new British Library, and the precautions taken to monitor and prevent ground movement and related damage to adjacent buildings and London Underground tunnels. Discusses the proposed construction sequence, the prediction of ground movements and the comprehensive survey and ground instrumentation programme installed. Explains the type, purpose and criteria for the instrumentation required and details their positioning in order to monitor possible damage, with particular reference to London Underground and St Pancras Station. Details the results of the survey over the nine‐year construction period, in comparison with predictions, and the plans for continuation of surveys until work is complete.