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Correct assessment of soil properties in centrifuge tests require these to be measured during flight, and small vane and penetrometer devices have been developed with this purpose. The vane is fixed in position, but the penetrometer can traverse the length of the model, allowing tests to be made at different positions. A program of tests has been conducted in the centrifuge at 100g investigating the use of these methods in consolidated beds of clay. Clay beds consist of an overconsolidated layer with a top stiffer layer overlaying a normally consolidated layer. Curves of point resistance with depth are similar in shape to curves of vane strength with depth, and the stiffer layer obtained as a result of the stress history is indicated in both tests. However measured point resistances are lower than expected, which is attributed to water pressure effects around the cone tip.
vane tests, cone penetrometer tests, shear strength, soft clays, centrifuge tests, physical model
Associate professor, Post Graduation School, COPPE/UFRJ, Federal University of Rio de Janeiro, Rio de Janeiro, RJ
Lecturer, Cambridge University, Cambridge,