Influence of temperature on the preconsolidation pressure of normally consolidated clays over the full temperature domain

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4. Influence of temperature on the preconsolidation pressure of normally consolidated clays over the full temperature domain

The preconsolidation pressure of clays has previously been shown to be dependent on the consolidation temperature and stress state. Researchers have focused on the effect of either heating, heating-cooling, freezing or freezing-thawing on yield stress, but, due to the widening range of possible soil temperatures due to climate change and engineering applications, it is of interest to develop a framework which describes the effect of temperature on yield stress over the full temperature domain. Accordingly, the focus of this paper is the construction of the thermal yield surface of an normally consolidated (NC) Kaolin clay. Temperature-controlled consolidation tests were run on reconstituted NC Kaolin clay specimens, with the consolidation temperature being varied between -15 and 50 ^oC. Subsequently, the preconsolidation pressure of the specimens was determined via the Butterfield method, i.e., ln(1+e) versus ln(p) method. The thermal yield surface reflects the relative impact of each type of temperature change on the yield stress. Heating the specimen led to modest increase in the preconsolidation pressure while cooling led to relatively small increase. Freezing led to the largest increase in the preconsolidation pressure. The relative magnitude of the impact of each temperature change is related to the mechanism by which volume and stress changes are induced at the various temperatures.

4th Asia-Pacific Conference on Physical Modelling in Geotechnics (ACPMG2024)

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