... construction pre gramme for the station. Construction of the diaphragm walls within a pos itive bentonite slurry head and subsequent bulk excavationin dry conditionsrequired the lower aquifer to be dewatered.TheThanet Sands are in good hydrauliccontinuity with the underlying chalk,and the chalk is signif...

... ALIGNMENT INTERCHANGES TICKET HALLS SETTLEMENT ESCALATORS PLATFORMS TUNNELS TENDERS ARCHITECTS CONTRACTORS JOINT VENTURES GEOTECHNICS PILES CLAYS LONDON CLAY WOOLWICH BEDS READING BEDS SAND THANET SAND CHALK EARTH PRESSURE SOILS STRUTS SLABS DEMOLITION UNDERPINNING GROUND...

... INSTRUMENTS MONITORING CHALK ROUND HILL FOLKESTONE KENT UK ttoc.IJlstil Ciu E~grs, Ciu Equg, 1995, 108.May, 54-63. Construction of the A20 Round Hill tunnels, Kent G.P a t d o , BSc, CEng, MICE mmnmacwmaMuJ THhilel itnwoK4e0n0t...

... for the tunnelling machines. sure without systematic ground treatment. Five machines were used, three on the 4. In the marine section the alignment is marine tunnels and twoon the land through long stretchesof low permeability tunnels. The description is then devel- Chalk Marl. The TBMs were therefore also oped...

... survey was carriedout. study bymeans of the geostatic method. It 4. In 1964-65, an initiative by the Channel then looks into the geological data, stress- Tunnel StudyGroup gave rise to thme ost ing the presence of Chalk Mar1 which was important investigationso far with a seismic the subject of additional...

...P VARLEY; A DARBY; E RADCLIFFE © Thomas Telford and ICE 1992 MOTT MACDONALD TRANSLINK JOINT VENTURE TUNNELS CHANNEL TUNNEL GEOLOGY ALIGNMENT SURVEYS SITE INVESTIGATION METHODS DATA CHALK GAULT CLAYS GAULT CLAY LOWER CHALK GEOPHYSICS BOREHOLES MARL CHANNEL...