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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. 59-65;
DOI: 10.1144/GSL.ENG.1995.010.01.03
© 1995 Geological Society of London

Section 2: Construction of foundations

Engineering geology of Snebra Ghyll bridge, A595(T) Hensingham Bypass

M. J. Ball & B. E. F. Sims

Allott & Lomax, Consulting Engineers, Fairbairn House, Sale, Manchester M33 1WP, UK

The construction of Hensingham Bypass, Cumbria was completed in December 1991. Snebra Ghyll is a deep ravine opening into convex, rounded slopes at the top. An eight span arch bridge was adopted for the ghyll crossing, with bank seats supported on the approach embankments. The northern approach embankment has reinforced earth slopes above the ravine. Intermediate piers and arch springings are founded on bedrock, in which open joints were identified. These were grouted before foundationconstruction. Steep faces beneath the bridge are protected by soil nailing.