中文摘要：

预埋钢管能量桩是一种新型桩埋管形式的地源热泵技术；然而针对其特殊埋管形式下的承载特性的研究相对较少。针对预埋钢管单U型埋管能量桩的承载特性开展模型试验和数值模拟研究，测得在热．冷循环温度荷载作用下预埋钢管单u型埋管能量桩桩顶位移、桩体热应变及桩端阻力的变化规律；为了对比分析，同时进行传统绑扎单u型埋管能量桩的承载特性模型试验，并分析预埋钢管能量桩的适用性。研究结果表明，与传统绑扎单u型埋管形式相比，预埋钢管能量桩具有相对更优的承载性能；预埋钢管能量桩两种工况最终的桩顶位移比绑扎埋管能量桩分别小23％和13％，而桩体最大热应变分别仅为绑扎埋管能量桩的44％和25％，桩端阻力也分别比绑扎埋管能量桩小14％和35％。

英文摘要：

The energy pile with embedded steel tube is a new type of GSHP technology, however, there is a little study about the bearing characteristics of the new technology. The model test and numerical simulation research of the bearing characteristics of energy pile with U type embedded steel tube were carried out, and the displacement of pile top, thermal strain of pile shaft and tip resistance of the energy pile with embedded steel tube under hot-cold circular temperature load were measured. The model test of bearing characteristics of the ordinary energy pile with tied single U- shape tube was carried out at same time for contrastive analysis, and the applicability of energy pile with embedded steel tube was analyzed. The results show that the energy pile with embedded steel tube has a better bearing characteristics comparing with the ordinary energy pile with tied single U-shape tube. The final displacement of pile top of energy pile with embedded steel tube is 23% and 13% smaller than that of energy pile with tied tube in summer and winter mode, respectively, and the biggest thermal strain of energy pile with embedded steel tube is 44% and 25% of that of energy pile with tied tube in two modes, respectively, and the tip resistance of energy pile with embedded steel tube is 14% and 35% smaller than that of energy pile with tied tube in two modes, respectively.