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SUMMARY:Swansea Bay Tidal Lagoon Phase 1 Ground Investigation - Simon Holt
  (Principal Engineering Geologist\, Ground Engineering\, ATKINS)
DTSTART:20160203T193000Z
DTEND:20160203T203000Z
UID:TALK64235@talks.cam.ac.uk
CONTACT:Stefan Ritter
DESCRIPTION:Seminar overview: The proposed scheme by Tidal Lagoon (Swansea
 ) plc comprises a 9.5km breakwater embankment up to 20m high\, enclosing a
 n 11.5km2 lagoon. The average Spring tide range is 8.5m and this will be h
 arnessed to provide 320MW of electricity to 155\,000 homes. In order to pr
 ovide sufficient information for Front End Engineering Design (FEED) and t
 he planning application\, a Phase 1 preliminary ground investigation ensur
 ed a good understanding of the potential geological and geotechnical risks
  and provided greater certainty on proposed construction costs. One of the
  objectives was to determine properties of shallow sediments and assess su
 itability for hydraulic fill from insitu and laboratory tests.\nFollowing 
 a desk study phase and initial geophysical survey\, the ground investigati
 on was designed by Atkins Limited\; Environmental Scientifics Group was th
 e Principal Contractor for the £0.5M works. A variety of techniques were 
 required\, including dynamic sampling in intertidal areas\, overwater bore
 holes from a jackup platform and CPT and vibrocoring from a survey vessel.
  Geological units were derived based on their origin and geotechnical prop
 erties from geotechnical laboratory and insitu testing. The spatial distri
 bution of marine and glacial deposits together with geophysical profiles l
 ed to the development of a preliminary geological model. A central ridge o
 f fluvio-glacial sands and gravels divides different marine deposits and l
 arge variations in rockhead level are present as a result of glacially inc
 ised rock basins.\n\nShort biography:\nSimon Holt is a Principal Engineeri
 ng Geologist at Atkins and has over 18 years' experience working in the Gr
 ound Engineering sector in the UK and Hong Kong. He previously managed the
  initial ground investigation phase for the Swansea Bay Tidal lagoon and p
 resented the project at the 2015 European Conference for Soil Mechanics an
 d Geotechnical Engineering in Edinburgh.  Simon currently manages a team i
 n Croydon providing ground engineering services to the Rail sector includi
 ng earthworks within the Anglia Region.\n
LOCATION:Room N7\, Pembroke College
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