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Long-term thermo-mechanical behavior of energy pile in dry sand

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Abstract

A small-scale pile has been developed in the laboratory to investigate the thermo-mechanical behavior of energy piles subjected to a significant number of thermal cycles. The pile (20 mm external diameter), installed in dry sand, was initially loaded at its head to 0, 20, 40 and 60% of its ultimate bearing capacity (500 N). At the end of each loading step, 30 heating/cooling cycles were applied. The long-term behavior of the pile was observed in terms of head settlement, axial force profile, soil and pile temperature, and stress in soil. The results evidence the irreversible settlement of the pile head induced by thermal cycles under constant load head. In addition, the incremental irreversible settlement that accumulates after each thermal cycle decreases when the number of cycles increases. The evolution of irreversible pile head settlement versus number of cycles can be reasonably predicted by an asymptotic equation.

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Authors and Affiliations

  1. Laboratoire Navier, École des Ponts ParisTech, 6-8 avenue Blaise Pascal, Cité Descartes, Champs-sur-Marne, 77455, Marne-la-Vallée, France

    Van Tri Nguyen, Anh Minh Tang & Jean-Michel Pereira

  2. Hanoi University of Mining and Geology, Hanoi, Vietnam

    Van Tri Nguyen

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  1. Van Tri Nguyen
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  2. Anh Minh Tang
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  3. Jean-Michel Pereira
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Correspondence to Anh Minh Tang.

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Nguyen, V.T., Tang, A.M. & Pereira, JM. Long-term thermo-mechanical behavior of energy pile in dry sand. Acta Geotech. 12, 729–737 (2017). https://doi.org/10.1007/s11440-017-0539-z

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  • DOI: https://doi.org/10.1007/s11440-017-0539-z

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