Performance of a Prestressed Concrete Pipe Energy Pile during Heating and Cooling
Publication: Journal of Performance of Constructed Facilities
Volume 31, Issue 3
Abstract
Energy pile, piled foundation incorporating pipe loops for ground source heat pump systems, has been implemented in more and more countries. However, the mechanical performance of energy pile has not been comprehensively studied. To improve the understanding on the performance of energy pile, a field study on energy pile is carried out in this study. A prestressed concrete pipe pile installed with water pipe loops inside was tested as an energy pile in the field. The performance of energy pile during heating and cooling was investigated by using vibrating-wire stress gauges and temperature sensors. The field tests reveal that the temperature influence distance of the energy pile on surrounding soil is approximately 0.5 m from the center of the pile after heating for 60 h. The axial force of energy pile increases/decreases with the increase/decrease of temperature at different rates at different depths. The neutral plane shifts from above 7.7 to below 7.7-m depth because of heating. The magnitudes of shaft resistance increase with temperature increase and decrease with temperature decrease.
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Acknowledgments
The authors would like to acknowledge the financial supports sponsored by Qing Lan Project of Jiangsu Province and National Natural Science Foundation of China (No. 51178160, 51378178, and 51308190). The Doctoral Program of Higher Education and Research Grants Council Earmarked Research Grants Joint Research (No. 20130094140001, M-HKUST603/13, and GRF617213) are also acknowledged.
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Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 31 • Issue 3 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 13, 2015
Accepted: Sep 19, 2016
Published ahead of print: Jan 16, 2017
Published online: Jan 17, 2017
Published in print: Jun 1, 2017
Discussion open until: Jun 17, 2017
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