Investigation of Thermal Loading Effects on Behavior of Energy Piles Subjected to Lateral Loading
Publication: IFCEE 2021
ABSTRACT
The operation of the ground source heat pumps (GSHPs) coupled with energy piles subjects the foundation and the surrounding soil to temperature changes and cycles, which affect the thermo-mechanical behavior of energy piles. The majority of the research presented in the literature focuses on the effects of temperature change on axial serviceability and resistance of energy piles. However, studies evaluating the effects of temperature change and cycles on the behavior of energy piles subjected to lateral loading are scarce. The behavior of soils surrounding energy piles is affected by temperature changes and cycles, soil volumetric change, thermally induced pore water pressure, and thermally induced water flow. Hence, it is anticipated that the thermo-mechanical soil-structure interaction of laterally loaded energy piles is affected by similar factors. This paper aims to assess the behavior of laterally loaded model energy piles subjected to thermal loading. An instrumented aluminum energy pile with diameter of 51 mm and an embedded length of 0.41 m installed in saturated moderately overconsolidated clayey soil was utilized in this study. The pile was instrumented with strain gauges and temperature sensors, and the surrounding soil was instrumented with temperature and pore water pressure sensors. The mechanical and thermal responses of a heating and a baseline (no temperature change) test are analyzed and compared in the current study. The experimental results indicate that the operation of the GSHPs connected to energy piles affects the soil strength and the soil-pile interaction behavior when the pile is subjected to lateral loading.
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REFERENCES
Adam, D., and Markiewicz, R. (2009). “Energy from earth-coupled structures, foundations, tunnels and sewers.” Géotechnique, 59(3), 229–236.
Bourne-Webb, P. J., Amatya, B., Soga, K., Amis, T., Davidson, C., and Payne, P. (2009). “Energy pile test at Lambeth College, London: geotechnical and thermodynamic aspects of pile response to heat cycles.” Géotechnique, 59(3), 237–248.
Brandl, H. (2006). “Energy foundations and other thermo-active ground structures.” Géotechnique, 56(2), 81–122.
Elzeiny, R., Suleiman, M. T., Xiao, S., Abu Qamar, M., and Al-Khawaja, M. (2020). “Laboratory-Scale Pull-Out Tests on a Geothermal Energy Pile in Dry Sand Subjected to Heating Cycles.” Canadian Geotechnical Journal, cgj-2019-0143.
Fuentes, R., Pinyol, N., and Alonso, E. (2016). “Effect of temperature induced excess porewater pressures on the shaft bearing capacity of geothermal piles.” Geomechanics for Energy and the Environment, 8, 30–37.
Ghaawod, I., and McCartney, J. S. (2018). “Centrifuge Modeling of Temperature Effects on the Pullout Capacity of Energy Piles in Clay.” Proceedings of the 43rd Annual Conference on Deep Foundations, DFI, Anaheim, CA, 24–27.
Laloui, L., Nuth, M., and Vulliet, L. (2006). “Experimental and numerical investigations of the behaviour of a heat exchanger pile.” International Journal for Numerical and Analytical Methods in Geomechanics, 30(8), 763–781.
Lee, S., Speight, J., and Loyalka, S. (2014). Handbook of alternative fuel technologies.
McCartney, J. S., and Rosenberg, J. E. (2011). “Impact of heat exchange on side shear in thermo-active foundations.” Geotechnical Special Publication, 488–498.
McKinstry, H. A. (1965). “Thermal expansion of clay minerals.” American Mineralogist, 50(1–2), 212–222.
Nguyen, V. T., Tang, A. M., and Pereira, J.-M. (2017). “Long-term thermo-mechanical behavior of energy pile in dry sand.” Acta Geotechnica, Springer Verlag, 12(4), 729–737.
Sekine, K., Ooka, R., Yokoi, M., Shiba, Y., and Hwang, S. H. (2007). “Development of a ground-source heat pump system with ground heat exchanger utilizing the cast-in-place concrete pile foundations of buildings.” ASHRAE Transactions, 558–566.
Wood, D. M., Crewe, A., and Taylor, C. (2002). “Shaking table testing of geotechnical models.” International Journal of Physical Modelling in Geotechnics, Thomas Telford Ltd., 2(1), 01–13.
Wood, C. J., Liu, H., and Riffat, S. B. (2009). “Use of energy piles in a residential building, and effects on ground temperature and heat pump efficiency.” Géotechnique, 59(3), 287–290.
Yazdani, S. (2019). Study of The Long-Term Shaft Resistance of Energy Piles in Saturated Clays. Diss. University of Wisconsin-Milwaukee.
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IFCEE 2021
Pages: 576 - 584
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© 2021 American Society of Civil Engineers.
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Published online: May 6, 2021
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