Geothermal operation of energy piles involves an interplay between the multi-physical phenomena governing the behaviours of soils, geostructures and the interactions between them, which are mainly characterized by the associated temperature variations. This state-of-the-art paper brings together the experimental findings from several field and laboratory investigations to attain a thorough understanding of the responses of soils and soil–structure interfaces under non-isothermal conditions, which is of paramount importance for the analysis of energy geostructures. First, the outcomes from thermal oedometer and triaxial tests are presented, revealing the related volumetric strains and changes in shear strength experienced by soils near the vicinity of energy piles. Next, the results from the direct shear tests performed on soil–concrete​ interfaces under thermal and mechanical conditions, similar to those experienced by soil–energy pile interactions, are introduced. Finally, full-scale field tests focusing on the responses of single and groups of energy piles to monotonic and cyclic temperature variations are presented. The design and development of the laboratory testing devices, as well as the experimental setup for the field tests, are also detailed in the paper, preceding the corresponding outcomes.

能量堆的地热运行涉及控制土壤，地质结构和它们之间相互作用的多种物理现象之间的相互作用，这些现象主要表现为相关的温度变化。这份最新的论文汇集了来自多个现场和实验室研究的实验结果，以全面了解非等温条件下土壤和土壤-结构界面的响应，这对于分析土壤中的水分至关重要。能源地质结构。首先，介绍了热里程表和三轴测试的结果，揭示了能量桩附近土壤的相关体积应变和剪切强度的变化。下一个，介绍了在热和机械条件下在土-混凝土界面上进行的直接剪切试验的结果，类似于土-能量桩相互作用所经历的结果。最后，提出了针对单个和成组能量堆对单调和循环温度变化的响应的全面现场测试。在相应结果之前，论文中还详细介绍了实验室测试设备的设计和开发以及用于现场测试的实验装置。