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Geological Society, London, Engineering Geology Special Publications
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Geological Society, London, Engineering Geology Special Publications; 1995; v. 10; p. 67-77;
DOI: 10.1144/GSL.ENG.1995.010.01.04
© 1995 Geological Society of London

Section 2: Construction of foundations

The Bargate Centre, Southampton: engineering geological and geohydrological aspects of the excavation for basement construction

M. E. Barton

Department of Civil Engineering, University of Southampton, Southampton S09 5NH, UK

The Bargate Centre is a large, four-storey shopping arcade constructed during 1986–1990 within the medieval town walls of Southampton. It incorporates a basement requiring construction to between 6–7 m below ground level through fill, brickearth, and water-bearing river terrace gravels overlying mainly laminated clays of the Bracklesham Group. The case record is of particular interest in that the excavation cut-off wall acted as a barrier to the original (that is,pre-excavation) groundwater seepage in the terrace gravels. Observations of the piezometric levels before and after construction confirm ponding on the upstream side of the basement. However, it appears that the pre-construction seepage pattern on the downstream side was modified by the medieval double moats which are known, at least in part, to have been excavated into the terrace gravels.