Thermomechanical Behaviors of an Energy Pile–Raft Foundation under Intermittent Operation with Forced Heat Recharge
Publication: International Journal of Geomechanics
Volume 22, Issue 10
Abstract
This paper presents an experimental investigation of the thermal and mechanical behaviors of an energy pile–raft foundation under intermittent heating operation with forced heat recharge, with 16 h of pile cooling and 8 h of forced heat recharge (referred to as 16F, where F indicates forced). The forced heat recharge was found to increase the daily heat exchange rate to 180 W/m, which was 50% higher than the value under general intermittent heating operation without forced heat recharge. The raft and building load at the pile head imposed a significant restraint on the upper part of the energy pile, leading to a minimum degrees of freedom (0.27) near the pile head. The mechanical behaviors of the pile, including strains, stresses, and pile end displacements and stresses, followed reversible paths when plotted against the daily temperature cycles. A slight residual pressure stress (10 kPa) was observed at the bottom of the raft during the initial thermal cycles.
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Acknowledgments
The work presented in this paper was supported by the National Natural Science Foundation of China (Grant No. 51922037), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX22_0611), and the Fundamental Research Funds for the Central Universities.
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© 2022 American Society of Civil Engineers.
History
Received: Oct 7, 2021
Accepted: Jun 12, 2022
Published online: Aug 9, 2022
Published in print: Oct 1, 2022
Discussion open until: Jan 9, 2023
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