One-of-a-kind experimental and numerical investigation is provided in this paper about energy sheet pile walls: earth retaining structures that embed heat exchanger probes within piles for the exploitation of shallow geothermal energy. The study resorts to the results of full-scale in situ tests and coupled three-dimensional thermo-mechanical finite element analyses of an energy sheet pile wall constructed in an underground station. In this context, an investigation about the influence of thermal boundary and initial conditions on thermo-mechanical behaviour of the energy sheet pile wall is performed. The addressed thermal boundary conditions are associated with the thermal load imposed on the considered foundation by the field environment and the geothermal operation of some energy piles constituting the wall. The addressed thermal initial conditions are associated with the undisturbed ground temperature field of the considered site. Based on a comparison between the experimental and numerical results, and the development of numerical sensitivity analyses, criticalities associated with the analysis and modelling of the thermo-mechanical behaviour of energy sheet pile walls are denoted. The results highlight that: a marked non-uniformity of the temperature field can characterise real applications of energy sheet pile walls, representing a significant challenge to capture numerically at all spatial locations; a comparable influence denotes thermal loads that derive from the field environment and the geothermal operation of energy sheet pile walls, deserving attention when modelling the behaviour of such geostructures; and a critical role of the initial thermal conditions is connected to the satisfactory understanding and prediction of the thermo-mechanical behaviour of energy sheet pile walls, requiring careful consideration for analysis and design purposes.

本文提供了有关能量板桩墙的一种实验和数值研究：将挡土板嵌入换热桩中的浅土层结构，以利用浅层地热能。该研究依靠地下车站的能量板桩墙的全面原位测试结果以及三维热机械有限元分析。在这种情况下，进行了关于热边界和初始条件对能量板桩壁的热机械行为的影响的研究。所提出的热边界条件与现场环境和构成墙体的某些能量堆的地热运行对所考虑的基础施加的热负荷相关。所述的热初始条件与所考虑地点的不受干扰的地面温度场相关。基于实验结果与数值结果的比较，以及数值灵敏度分析的发展，指出了与能量板桩壁热力学行为的分析和建模相关的临界点。结果表明：温度场的明显不均匀性可以表征能量板桩壁的实际应用，这代表了在所有空间位置进行数字捕获的重大挑战；具有可比性的影响表示源自现场环境和能量板桩墙的地热运行的热负荷，在对此类地质结构的行为进行建模时应引起注意；