Tsinghua thermodynamic soil model for simulating energy engineering projects

CHENG Xiaohui; ZHAO Naifeng; WANG Hao; ZHANG Zhichao

doi:10.16511/j.cnki.qhdxxb.2020.25.024

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Journal of Tsinghua University(Science and Technology) ›› 2020, Vol. 60 ›› Issue (9) : 707-714. DOI: 10.16511/j.cnki.qhdxxb.2020.25.024

SPECIAL SECTION: ENERGY GEOSTRUCTURE AND ENGINEERING

Tsinghua thermodynamic soil model for simulating energy engineering projects

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Abstract

Energy piles utilize pile foundations to exchange heat with the surrounding rock and soil to facilitate efficient use of shallow geothermal energy supplies. An energy pile design is given that improves the thermo-mechanical coupling of the soil with the energy pile. Specifically, this paper summaries the influences of temperature and stress on the volume change of saturated clays with evaluations of the thermo-mechanical constitutive models in the literature. A Tsinghua thermodynamic soil (TTS) model is then used in finite element simulations of the thermo-mechanical behavior of elevated temperature oedometer tests of Kaolin clay with an energy pile. The predictions show that heating reduces the bearing capacity of the energy pile foundation, the interfacial normal stress and the shear stress. The results also show that the interfacial shear stress increases with increasing temperature and foundation depth, while the interfacial normal stress changes little. Cooling reduces the energy pile-soil interface interactions, increases foundation settling and reduces the bearing capacity.

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energy underground structure / thermal creep test / non-equilibrium thermodynamics / thermo-mechanical coupling / constitutive model

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CHENG Xiaohui, ZHAO Naifeng, WANG Hao, ZHANG Zhichao. Tsinghua thermodynamic soil model for simulating energy engineering projects[J]. Journal of Tsinghua University(Science and Technology). 2020, 60(9): 707-714 https://doi.org/10.16511/j.cnki.qhdxxb.2020.25.024

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