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Geological Society, London, Engineering Geology Special Publications
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Geological Society, London, Engineering Geology Special Publications; 1990; v. 6; p. 67-75;
DOI: 10.1144/GSL.ENG.1990.006.01.07
© 1990 Geological Society of London

Session 3: Pressuremeter and Dilatometer Testing in Rocks

Some recent in situ stress testing experience with strong clays and weak rocks in Britain

M. C. Stevenson, J. H. Martin & P. O. Squire

Sir Alexander Gibb & Partners, Earley House, 427 London Road, Reading RG6 1BL, UK

Intensive pressuremeter testing at two sites in lower Lias clays, together with laboratory testing has enabled general conclusions to be drawn about strength-stress compatibility in heavily overconsolidated materials. Three limit states of effective horizontal stress are described which demarcate in situ test results into four distinct ranges relating to the stress history of the material. These may be used to validate pressuremeter measurements. The in situ test results for the two sites are related to the regional geomorphology and the results of conventional geological logging.