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Application of Hysteretic Trends in the Preconsolidation Stress of Unsaturated Soils

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Abstract

This paper involves an evaluation of a relationship describing the evolution in yield stress of unsaturated soils during hydraulic hysteresis, and an application of this relationship in an elasto-plastic framework to predict the compression curves of unsaturated soils under drained (free outflow of air and water with constant suction) or undrained (constant water content with no outflow of water and varying suction) conditions. The yield stress was quantified as the apparent mean effective preconsolidation stress obtained from compression tests reported in the literature on specimens that had experienced different hydraulic paths. It was observed that the preconsolidation stress does not follow a hysteretic path when plotted as a function of matric suction, but does when plotted as a function of the degree of saturation. Accordingly, an existing logarithmic relationship between the preconsolidation stress and matric suction normalized by the air entry suction was found to match the experimental preconsolidation stress results. This same relationship was also able to satisfactorily predict the trends in preconsolidation stress with degree of saturation by substituting the hysteretic soil–water retention curve (SWRC) into the place of the matric suction. The relationship between preconsolidation stress and suction was combined with an elasto-plastic framework to predict the compression curves of soils during drained compression, while the wetting-path relationship between preconsolidation stress and degree of saturation was combined with the framework to predict the compression curves of soils during undrained (constant water content) compression. A good match was obtained with experimental data from the literature, indicating the relevance of considering the hysteretic SWRC and preconsolidation relationships when simulating the behavior of unsaturated soils following different hydro-mechanical paths.

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Acknowledgements

The authors appreciate the support from National Science Foundation grant CMMI-1054190. The views in this paper are those of the authors alone.

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Correspondence to J. S. McCartney.

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Mun, W., Coccia, C.J.R. & McCartney, J.S. Application of Hysteretic Trends in the Preconsolidation Stress of Unsaturated Soils. Geotech Geol Eng 36, 193–207 (2018). https://doi.org/10.1007/s10706-017-0316-7

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  • DOI: https://doi.org/10.1007/s10706-017-0316-7

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