In this paper, four individual full-scale tests were carried out to study the mechanical response of a cast-in-place energy pile beneath a liquefied natural gas (LNG) tank subjected to separated and coupled thermo-mechanical loads. The results show that the temperature profiles displayed a comparable trend in response to pile heating, cooling and recovery. Specifically, the temperature at the mid-depth of the pile fluctuated rapidly, while the changes at both ends were relatively slower. During the thermal stages, when the pile had the flexibility to expand or contract, the observed strain at the pile head significantly deviated from the free thermal strain. In contrast, the strain at the pile toe was relatively aligned with the free thermal strain. The thermally induced stress obtained at the end of the coupled loading–cooling stage was found to exceed the tensile strength of the C40 reinforced concrete. However, under the actual testing conditions, both the settlement and the bearing capacity of the pile remained well within the required values, ensuring the structure of the LNG tank will not be damaged.

中文翻译：

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承受分离和耦合热机械载荷的长能量堆的全尺寸测试

在本文中，进行了四次单独的全尺寸试验，以研究液化天然气（LNG）罐下方的现浇能源桩在分离和耦合热机械载荷作用下的机械响应。结果表明，温度曲线对堆加热、冷却和恢复的响应显示出类似的趋势。具体来看，桩体中部温度波动较快，两端温度变化相对较慢。在热阶段，当桩具有膨胀或收缩的灵活性时，观察到的桩头应变与自由热应变显着偏离。相反，桩趾处的应变与自由热应变相对一致。发现在耦合加载-冷却阶段结束时获得的热致应力超过了 C40 钢筋混凝土的抗拉强度。但在实际测试条件下，桩的沉降和承载力均保持在要求值以内，保证了LNG储罐的结构不会受到破坏。