Abstract
The results from three series of cyclic triaxial tests with strong implications on the practical application of the high-cycle accumulation (HCA) model of Niemunis et al. [13] are discussed. Tests with packages of cycles successively applied at different average stresses show that the memory of a cyclic preloading that is built up during the cycles can be partly or fully erased by a subsequent monotonic loading. In the present case the variation of the average stress between the packages of cycles represents such monotonic loading. The second test series with multiple changes of the polarization between succeeding packages of cycles reveals that the influence of such changes, that is described by the factor ƒ π in the HCA model, is probably less pronounced than previously thought. A significant acceleration of strain accumulation was observed due to the first change of the polarization only, while the effect of the subsequent variations of the polarization were rather moderate. The third test series with a comparison of samples prepared by either air pluviation or moist tamping demonstrates the important influence of the initial fabric of the sand, i.e. the sample preparation method in the laboratory, on the cumulative strains and thus on various components of the HCA model.
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Wichtmann, T. (2015). New findings regarding the behaviour of soils under cyclic loading. In: Schanz, T., Hettler, A. (eds) Aktuelle Forschung in der Bodenmechanik 2015. Springer Vieweg, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-45991-1_3
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DOI: https://doi.org/10.1007/978-3-662-45991-1_3
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