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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. 77-83;
DOI: 10.1144/GSL.ENG.1990.006.01.08
© 1990 Geological Society of London

Session 3: Pressuremeter and Dilatometer Testing in Rocks

Calibration and its effect on the results of pressuremeter tests in weak rocks

D. C. Curtis, P. Ansell & B. A. Leach

Allott & Lomax, Consulting Engineers, Ashton Lane, Sale, Manchester, M33 1WP, UK

The paper describes in situ testing recently carried out in Keuper Marl using the Hughes high-pressure dilatometer for which an extensive study into calibration and its effects on results was made. The various calibrations performed are described followed by discussion of the effects of calibration corrections on the results obtained. The findings illustrate the importance of proper calibrations before and during a pressuremeter testing programme. In particular, the significance of membrane compression calibrations when testing mudstones classified as weak to moderately weak or stronger is highlighted.