Heat transfer and thermal-mechanical coupling characteristics of an energy pile with groundwater seepage

YANG Weibo; YAN Chaoyi; ZHANG Laijun; WANG Feng

doi:10.16511/j.cnki.qhdxxb.2022.22.015

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Journal of Tsinghua University(Science and Technology) ›› 2022, Vol. 62 ›› Issue (5) : 891-899. DOI: 10.16511/j.cnki.qhdxxb.2022.22.015

SPECIAL SECTION: ENERGY GEOSTRUCTURE AND ENGINEERING

Heat transfer and thermal-mechanical coupling characteristics of an energy pile with groundwater seepage

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Abstract

The effects of groundwater seepage on the heat transfer and thermo-mechanical coupling characteristics of an energy pile were analyzed using a coupled thermal-mechanical numerical model of the energy pile with seepage. The model shows how the groundwater seepage affects the thermodynamic properties of the energy pile during summer. The results show that in the summer mode the heat transfer of the energy pile with a horizontal seepage velocity of 60 m/a is 1.34 times larger than without seepage. The temperature rise in the pile is then reduced by 9.12%. The groundwater seepage reduces the variations of the pile body displacement, axial force, and the pile side friction while the energy pile rapidly becomes stable. In addition, the groundwater seepage reduces the effect of soil heat in the upstream seepage, but increases the influence of the soil heat in the downstream seepage.

Key words

ground source heat pump / energy pile / groundwater seepage / heat transfer / thermo-mechanical coupling characteristics

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YANG Weibo, YAN Chaoyi, ZHANG Laijun, WANG Feng. Heat transfer and thermal-mechanical coupling characteristics of an energy pile with groundwater seepage[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(5): 891-899 https://doi.org/10.16511/j.cnki.qhdxxb.2022.22.015

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