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Outline
To investigate the influence of pile‑soil parameters on the thermo‑mechanical coupling characteristics of energy pipe piles with phase change materials，a combined method of 3D numerical simulation and experimental validation was adopted to analyze the effects of heat exchange tube form，pile material，soil type，and layered conditions.The results show that the heat exchange capacity per unit pile depth follows a descending order for coaxial pipe，double U‑tube，and single U‑tube heat exchangers，measuring 81，71.44，54.51 W/m，respectively，at the end of operation.The coaxial pipe configuration delays the recovery of the summer phase change material （PCM-S） under long‑term operation，expands the thermal influence zone of the surrounding soil，and intensifies the changes in the mechanical performance of the pile.Different pipe pile materials lead to variations in heat exchange capacity and PCM-S liquefaction rate due to differences in thermal conductivity：during the PCM-S phase change period，C80 exhibits the highest heat exchange，while C100 shows the lowest；after phase change completion，C100 achieves the highest heat exchange （55.77 W/m），and C80 the lowest （54.5 W/m）.The axial force and side friction resistance of the pile are highest for C80，followed by C90，and lowest for C100.Increasing the thermal conductivity of the soil enhances heat exchange performance and reduces the thermo‑mechanical response of the pile.In layered soils，an arrangement with increasing thermal conductivity from top to bottom is most conducive to heat exchange，and high thermal conductivity soil layers accelerate heat diffusion，reducing thermo‑mechanical changes in the pile.This research provides a theoretical basis for the optimal design of pile‑soil parameters in energy pipe piles with phase change materials.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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