Abstract
The analysis of foundations in fine grained, mostly soft soils leads to the question if either an undrained or drained analysis is appropriate to describe the ultimate limit state of a certain structure. Triaxial tests show that the undrained shear strength su is no proper soil parameter but strongly dependent on the initial conditions (OCR-value) and on the developing stress path. The analytical modelling of raft foundations in drained and undrained conditions shows the difficulties of using su based on triaxial tests. More triaxial tests and the study of different geotechnical structures are needed to give advice whether the short term behaviour (undrained) or the long term behaviour (drained) is supposed to be most critical.
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Acknowledgements
We are most grateful to the help of Ralf Herzog from the Institute for Geotechnical Engineering at ETH Zurich. He supported us preparing the soil specimens for the triaxial tests.
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Arnold, A., Krähenbühl, M., Schmid, A. (2017). Drained and Undrained Analysis for Foundations Based on Triaxial Tests. In: Ferrari, A., Laloui, L. (eds) Advances in Laboratory Testing and Modelling of Soils and Shales (ATMSS). ATMSS 2017. Springer Series in Geomechanics and Geoengineering. Springer, Cham. https://doi.org/10.1007/978-3-319-52773-4_49
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DOI: https://doi.org/10.1007/978-3-319-52773-4_49
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