Energy pile is a new technique which can save underground space and construction cost. However

the research focused on regarding the thermomechanical behavior between the pile and soil during heating and cooling are relative little. Based on the model test method

the experiment aims at systematically studying the thermomechanical behavior

heat transfer performance and bearing characteristics of four heat exchangers type piles including U-shaped (lashed and embedded types)

W-shaped and Spiral-shape on saturated sand. The temperature of the pile and surrounding soil

the variation of tip resistance and horizontal soil pressure

and the pile head settlement are monitored. Meanwhile

the thermal strain of piles over time is also extrapolated. The results show that the pile temperature

thermal strain

pile head settlement and surrounding soil pressure related to W-shaped pile varies more obvious than Spiral-shape pile and single U-shaped pile.