能量桩是一种可以节省地下空间和施工埋管费用的新技术，目前针对其在供暖和制冷过程中土体和桩基之间的相互作用机制研究却相对较少。基于模型试验方法，系统地研究了饱和砂土中单U型（绑扎和预埋形式）、W型和螺旋型等4种不同埋管形式情况下的能量桩热力学效应、传热和承载特性，测得桩体和桩周土体温度、桩端阻力、水平土压力、桩顶位移以及桩体应变随时间的变化规律。试验结果表明，在相同输入功率情况下W型埋管形式桩体的温度、土体压力、应力和桩顶位移均较螺旋型和U型埋管形式的情况大。

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.