Damage to the Mansion House in London after settlements occurring during the first phase of tunneling for the extension of the Docklands Light Railway halted work until a satisfactory protection program was in place. Various means of protecting the landmark structure were explored, ranging from full structural underpinning to an observational method. This paper describes the background to the development and implementation of the observational method to protect the structure and complete the railway extension. Contingency measures were identified and planned in advance. A system of structural ties through the building was chosen as the most appropriate, least risky, and most economical contingency for preventing damage and strengthening the structure. Trigger levels for building response were established. Extensive instrumentation in the building provided full monitoring during the subsequent phases of tunneling.


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  • Accession Number: 00711552
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 19 1995 12:00AM