Clarges Estate
A £160 million ‘super prime’ residential and commercial development overlooking Green Park and Buckingham Palace
- Location
- Piccadilly, London W1
- Client
- Clarges Estate Property Management Ltd
- Date of investigation
- October 2013
- Consulting engineers
- Waterman Structures Ltd
Project managers: GVA Second London Wall
The scheme included 34 luxury apartments, offices at the centre of the site and a bespoke new headquarters for the Kennel Club. A new deep basement was included beneath part of the building footprint, involving excavation to more than 12m depth below existing basement level.
The investigation included the following elements:
- Cable percussive boreholes to between 45m and 48m depth. Limited access within existing buildings, so a specialist demountable basement rig was used
- Rotary boreholes to 60m depth using Geobor S coring to produce high quality soil cores
- In-situ self-boring pressuremeter testing
- Advanced laboratory testing including anisotropically consolidated triaxial tests (stress path) including Bender element to determine Gmax
- Horizontal and vertical concrete coring
- Hand-excavated trial pits to expose existing foundations up to 3m deep
Depth reached
60m
Rotary borehole
48m
Bars drawn to scale against the 71.50m deepest hole on our featured projects.Cable percussive (deepest)
Two Jubilee Line tunnels directly beneath
Geotechnical challenges included the presence of two Jubilee Line tunnels directly beneath the site. This required a high quality ground investigation to provide realistic parameters for ground movement analysis.
