BUILDING CONSTRUCTION ON SOFT ALLUVIUM

Within the past few years the increasing quantities of bulk materials being shipped in and out of Britain, and the rising cost of their transportation to and from the dockside, have been an incentive to the industrial users and producers of such materials to develop sites on river estuaries with good access to shipping. Formerly such sites would probably not have been considered economically suitable for development because of poor soil conditions, which generally consist of thick deposits of soft compressible clays and silts with intercalations of peat. These soft soils are unsuitable foundation materials and most structures on such sites have to be supported by piles founded on suitable bearing strata which often only exist at considerable depths below ground surface. For medium to heavy structures of small plan area, piled footings may not be too expensive, but for the single storey store or warehouse-type of structure covering large areas, the cost of piling works can be a substantial percentage of the total development costs. In cases where the superimposed floor loads in the proposed single storey structures are light, it may prove economical to support the structural columns by piled footings and allow the floor slab resting on the soft soils to settle. However, the compressibilities and shear strengths of alluvial clays and silts are normally such that floor loadings require to be limited to about 4 to 6 cwt/sq.ft. This article describes a method of stabilisation employed to improve the bearing capacity of soft alluvium for floor slab construction.

  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Watson, G H
    • Thorburn, S
  • Publication Date: 1966-3

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Filing Info

  • Accession Number: 00263646
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 19 1974 12:00AM