Data regarding energy pile behavior in tropical climate regions is not as readily available as in temperate climate regions, which are generally heating dominated (i.e., focused on extracting heat from a relatively cool subsurface). Further, there has not been a major effort to understand the behavior of micropiles converted into energy piles, which may have different behavior from other energy piles due to the disturbance associated with installation, especially at the toe. This paper presents the results of a series of thermal response tests (TRTs) on a 12 m-long instrumented energy micropile installed in a sedimentary tropical soil to understand the impacts of heating and cooling cycles. Vibrating wire strain gauges embedded within the energy micropile were used to assess the mechanical performance of the pile when subject to changes in temperature. Results indicate that the temperature distribution with depth and the resulting thermal axial strains are strongly dependent on the subsoil stratigraphy and are far from being homogeneous along the length of the pile. In particular, the temperature gradients across interfaces with an organic clay deposit were found to have a major effect on the thermal axial strains. Hysteresis in the thermal axial strains during the process of heating and cooling was also analyzed and was found to represent a diminishing effect on the mobilized coefficient of thermal expansion with each cycle.

关于热带气候地区能量堆行为的数据不像温带气候地区那样容易获得，温带气候地区通常以供暖为主（即专注于从相对凉爽的地下提取热量）。此外，还没有大力了解微型桩转换为能量桩的行为，由于与安装相关的干扰，特别是在脚趾处，微桩可能具有与其他能量桩不同的行为。本文介绍了对安装在热带沉积土壤中的 12 m 长仪器化能量微桩进行的一系列热响应测试 (TRT) 的结果，以了解加热和冷却循环的影响。嵌入能量微桩内的振弦应变计用于评估桩在温度变化时的机械性能。结果表明，温度随深度的分布和由此产生的轴向热应变强烈依赖于底土地层，并且沿桩长方向远非均匀。特别是，发现与有机粘土沉积物的界面上的温度梯度对轴向热应变有主要影响。还分析了加热和冷却过程中轴向热应变的滞后现象，发现每个循环对热膨胀动员系数的影响逐渐减弱。结果表明，温度随深度的分布和由此产生的轴向热应变强烈依赖于底土地层，并且沿桩长方向远非均匀。特别是，发现与有机粘土沉积物的界面上的温度梯度对轴向热应变有主要影响。还分析了加热和冷却过程中轴向热应变的滞后现象，发现每个循环对热膨胀动员系数的影响逐渐减弱。结果表明，温度随深度的分布和由此产生的轴向热应变强烈依赖于底土地层，并且沿桩长方向远非均匀。特别是，发现与有机粘土沉积物的界面上的温度梯度对轴向热应变有主要影响。还分析了加热和冷却过程中轴向热应变的滞后现象，发现每个循环对热膨胀动员系数的影响逐渐减弱。