Abstract
This study develops a simple method for rapid estimation of the thermomechanical response of an energy pile in a group. Based on the equilibrium condition of the force, the governing equations for a single energy pile are established using the finite difference method. An exponential model is used to describe the relationship between the unit skin friction and pile–soil relative displacement as well as the relationship between the unit end resistance and displacement at the pile end. Based on the Pyke model for the loading–unloading behavior of the pile–soil interface, the incremental relationship between the unit skin friction and pile shaft displacement, and the incremental relationship between the unit base resistance and pile end displacement, are presented in the unloading and reverse loading stages. Considering the mechanical and thermal loads and the reinforcing effect of neighboring piles, a simple method is proposed to analyze the thermomechanical response of an individual energy pile in a group. Comparisons between the measured and computed results of six well-documented cases are presented to verify the reliability of the proposed method.
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