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Modulus of subgrade reaction for foundations on clay from unconfined compression tests

Authors: Barounis, N., Orr, T.L.L., McMahon, P.H., Barounis, A.
Key words: unconfined compression strength test, clay, modulus of subgrade reaction kunc and kcons, mode of failure, Kc index, brittle failure, plastic yielding, partial shear
Source: Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering (ICSMGE 2009)
Pages: 4
Date: 2009-10-05
Location: Alexandria, Egypt
DOI: 10.3233/978-1-60750-031-5-249

The unconfined compression strength test for soils can be used to determine the modulus of subgrade reaction kunc in the laboratory. It proves more economical and saves time compared with in situ plate loading tests. The modulus obtained from such tests is considerably lower than the modulus obtained from consolidation tests due to the absence of lateral confinement. Stress-subgrade reaction modulus graphs (σ-k) are presented which show the behavior of k during loading. Some typical kunc values are given and also Kc values, the slope of the σ-k curve. Design values of foundations with dimensions B and L can be calculated by using proposed methodology.



This paper was added to our catalog on Thursday 25 February, 2010.

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