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Conference proceeding
Modulus of subgrade reaction for foundations on clay from unconfined compression tests
Published 2009
Proceedings of the ... International Conference on Soil Mechanics and Geotechnical Engineering, 17, 249 - 252
17th international conference on Soil mechanics and geotechnical engineering; the academia & practice of geotechnical engineering
The unconfined compression strength test for soils can be used to determine the modulus of subgrade reaction k (sub unc) 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 (sigma -k) are presented which show the behavior of k during loading. Some typical k (sub unc) values are given and also Kc values, the slope of the sigma -k curve. Design values of foundations with dimensions B and L can be calculated by using proposed methodology.