Interfacial thermal contact model for consolidation of multilayered saturated soils subjected to time-dependent heating and loading

Abstract

Heat transfers at the interface of adjacent saturated soil primarily through the soil particles and the water in the voids. The presence of water induces the contraction of heat flow lines at the interface, leading to the emergence of the thermal contact resistance effect. In this paper, four thermal contact models were developed to predict the thermal contact resistance at the interface of multilayered saturated soils. Based on the theory of thermal-hydro-mechanical coupling, semi-analytical solutions of thermal consolidation subjected to time-dependent heating and loading were obtained by employing Laplace transform and its inverse transformation. Thermal consolidation characteristics of multilayered saturated soils under four different thermal contact models were discussed, and the effects of thermal resistance coefficient, partition thermal contact coefficient, and temperature amplitude on the thermal consolidation process were investigated. The outcomes indicate that the general thermal contact model results in the most pronounced thermal gradient at the interface, which can be degenerated to the other three thermal contact models. The perfect thermal contact model overestimates the deformation of the saturated soil during the thermal consolidation. Moreover, the effect of temperature on consolidation properties decreases gradually with increasing interfacial contact thermal resistance.

Keywords

multilayered saturated soils / thermal consolidation / thermal contact resistance / time-dependent loading / Laplace transform

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