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Geological Society, London, Special Publications; 1990; v. 54; p. 399-404;
DOI: 10.1144/GSL.SP.1990.054.01.36
© 1990 Geological Society of London

Deformation of Weak Sediments

The undrained shear behaviour of fine-grained sediments

N. A. Yassir

Department of Earth Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
Department of Geological Sciences, University College, London WC1E 6BT, UK

A series of high pressure triaxial tests were conducted on three normally consolidated mud volcano silty clays to explore some of the effects on the undrained shear behaviour of argillaceous sediments. The tests followed two different consolidation paths before undrained shear: isotropic, with equal all-around stresses and anisotropic, at a horizontal to vertical effective stress ratio of 0.6. The tests showed that shear stresses produce overpressuring in the fine-grained sediments, and that the behaviour is sensitive to stress path, stress magnitude and grain size. Other important effects on the behaviour are also thought to include natural porosities and cementation.





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[Abstract] [PDF]