Abstract
Energy piles are increasingly being exploited worldwide for their dual functions of bearing structural loads and utilizing geothermal energy. However, scarce knowledge is available on the time-dependent thermomechanical behavior of energy pile groups constructed in soft soils. In this paper, an analytical approach was proposed for the thermomechanical analysis of energy pile groups considering the time-dependent deformation of viscoelastic soils and validated against field test data. The impact of the soil creep behavior on the axial load–displacement response and pile-soil-pile interaction of the energy piles was further investigated. Finally, a simplified method and design charts were provided for displacement estimation and design of energy pile groups in soft soils. The results indicated that the displacement of energy piles would change with time until stabilization because of the viscous properties of the soil. The interaction between energy piles was directly related to the pile-soil stiffness ratio, the soil viscosity coefficient, the pile slenderness ratio, the pile spacing, and the number of piles. The soil creep behavior would result in a decrease in the displacement ratio of energy pile groups under thermal loading and an increase under mechanical loading.
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