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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 technology that can save the cost of underground space and buried pipes. At present, the research on its interaction mechanism between soil and pile foundation in heating and cooling is relatively few. Based on the model test method, the thermodynamic, heat transfer and bearing characteristics of energy piles under single U-shaped (bundled and embedded), W-shaped and spiral-shaped buried pipes in saturated sand are systematically studied. The variation of soil temperature, pile end resistance, horizontal earth pressure, pile top displacement and pile strain with time were measured. The experimental results show that the temperature, soil pressure, stress and pile top displacement of the W-type buried pipe body are both larger than that of the spiral and U-shaped pipe pipe under the same input power.