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Grange Hotels Ltd

Date of investigation:

Oct 2011 to May 2013 (phased)

Consulting engineers:

Powell Tolner & Associates

A £65 million 9-storey luxury hotel redevelopment overlooking the Tower of London and the River Thames. The new building incorporated a two-level basement beneath part of its footprint. Particular geotechnical challenges included the presence of a Network Rail mainline on a raised Victorian viaduct immediately to the north of the site and the LUL Circle Line immediately to the west in a cut-and-cover tunnel. SCL undertook Phase 1 and Phase 2 investigations and Ground Movement Analysis to determine any effects on the adjacent rail/tunnel infrastructure. The investigation included the following:

  • Phase 1 Desk Study (Preliminary Risk Assessment)
  • Phase 2 intrusive investigation which included cable percussive boreholes to 40m depth
  • Geotechnical interpretative report including foundation recommendations and provision of design parameters
  • Environmental appraisal which summarised risks within the site and provided a Conceptual Site Model (CSM)
  • Ground Movement Analysis using Boussinesq theory to determine the movements beneath the adjacent railway/tunnels
  • 4637195535
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