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The author has been interested for several decades in finding better correlations, from the practical engineering point of view, between theory and the phenomenological behavior of highly compressible soils as observed in oedometer tests and in the field.
The author has developed a theory on secondary compression or intergranular viscosity in the consolidation process as he has gotten more experience in the field. The theory is based on two rheological models: the Terzaghi model and the Z-unit developed by the author. The theory has been revised, and currently offers good correlations in the interpretation of the phenomenon observed in practice.
The theory calls for the ability to develop fitting methods to obtain the parameters necessary for the formulae. Two fitting methods are used to cover the consolidation curves observed in the tests performed in the oedometer with undisturbed specimens and in the range of the recompression close to the critical stress. The method proposed also may be used after the critical stress zone has been passed and the soil structure is stabilized at a new stress level. Several examples of fitting calculations are given in the paper to acquaint the reader with the method for practical use.
The author discusses problems with the oedometer conventional test, and ends with recommendations and an analysis of the material presented.
consolidation of soils, secondary compression of soils, oedometer test, consolidation parameters of soils
Professor, Graduate School at the Faculty of Engineering; Universidad Nacional Autonoma de México, México, D.F.