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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. 211-218;
DOI: 10.1144/GSL.ENG.1995.010.01.17
© 1995 Geological Society of London

Section 3: Highway construction

Design and construction of an embankment incorporating polystyrene and geogrid reinforcement

A. L. Campton

Babtie Group, The Square, Martlesham Heath, Ipswich, Suffolk IP5 7SL, UK

An 800 m long and 5 m high acoustic bund has been successfully constructed along the top of the A3 trunk road cutting in London Clay near Guildford, Surrey. The bund generally comprises geogrid reinforced fill with slopes of up to 60°. In an area of sheared and fissured London Clay the bund incorporates polystyrene fill, from a level of 1.0 m below the original ground level, to prevent any surcharging of the top of the cutting. Polystyrene was also used as a backfill material to a retaining wall positioned in the middle of the bund to prevent settlement of an adjacent structure. The choices of materials, the design procedures and the methods of construction are considered.