Abstract
Energy pile is a deep foundation that combines two functions, transferring structural loads to the soil and serving buildings thermal needs. It is an innovative technology that also provides cost savings and environmental protection by reducing fossil energy utilization. In this review study, thermal changes due to heating and cooling cycles that significantly affect the load magnitude and distribution throughout the pile, especially the shear stress and axial load, are discussed. Also, a deep discussion is presented on the current development and mechanical behavior of energy piles. Finally, the essential factors that have the main effect of changing the thermal properties of soil are reported.