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Volume 41 Issue 11
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REN Lian-wei, XU Jian, KONG Gang-qiang, LIU Han-long. Field tests on thermal response characteristics of micro steel pile group under multiple temperature cycles in winter conditions[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(11): 2053-2060. DOI: 10.11779/CJGE201911010
Citation: REN Lian-wei, XU Jian, KONG Gang-qiang, LIU Han-long. Field tests on thermal response characteristics of micro steel pile group under multiple temperature cycles in winter conditions[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(11): 2053-2060. DOI: 10.11779/CJGE201911010
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Field tests on thermal response characteristics of micro steel pile group under multiple temperature cycles in winter conditions

  • 1. School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
    2. Key Laboratory of Geomechanics and Embankment Engineering, Ministry of Education, Hohai University, Nanjing 210024, China;
    3. College of Civil Engineering, Chongqing University, Chongqing 400045, China

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  • Received Date: November 29, 2018
  • Published Date: November 24, 2019
    Graphical Abstract
    • Abstract
  • The energy pile technology has dual functions of supporting superstructure and acting as shallow geothermal heat exchanger. As an energy-saving and emission-reduction technology, it has obtained certain development in recent years. Relying on the micro steel piles to reinforce the existing foundation underpinning project, the field tests on thermal response of the micro steel group piles under multiple temperature cycles are carried out. The variation of pile temperature and pile stress under different intermittent time is measured. The coefficients of performance (COP) of piles are discussed and analyzed. It is shown that the additional thermal stress of piles increases with the increasing cycling times, and the increase ratio decreases with the interval time; the COP of piles decreases with the increasing cycling times, and the decrease ratio decreases with the interval time. The values of the additional tensile stress does not exceed the design control range, which will not cause the damage of the pile.
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    • References (20)
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