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Study of thermal migration and induced mechanical effects in double U-tube energy piles

Institution:	1. China University of Geosciences (Wuhan), Faculty of Engineering, Wuhan 430074, PR China;2. Survey Research Institute of the Three Gorges Co. Ltd., Wuhan 430074, PR China;3. Changjiang Institute of Survey, Planning, Design and Research, No. 1863 Jiefang Road, Wuhan 430074, PR China;4. University of Erlangen-Nürnberg, GeoZentrum Nordbayern, Schlossgarten 5, 91054 Erlangen, Germany;1. Department of Civil Engineering, Stony Brook University, 116 Heavy Engineering Bldg., Stony Brook, 11794-2323 NY, USA;2. Department of Civil Engineering, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey;1. Tallinn University of Technology, Ehitajate tee 5, 19086, Tallinn, Estonia;2. Aalto University, School of Engineering, Rakentajanaukio 4 A, FI-02150, Espoo, Finland;3. Concordia University, Department of Building, Civil and Environmental Engineering, H3G 1M8c, Montreal, Canada

Abstract:	This paper investigates two geothermal energy piles using thermal response tests (TRTs). A set of parameters including pile wall temperature, ground temperature and strain are monitored at four different depths. The thermally induced mechanical behavior of the energy piles are then analyzed based on the monitoring data.The results show the following: (1) The temperature at the pile wall clearly varies throughout the heating and cooling cycle, and the ground temperature distribution shows a delay compared to the TRT stages. (2) The thermally induced mechanical effects are influenced by both the temperature and restraint conditions.

Keywords:	Energy piles Thermal response test Thermally induced mechanical effects Restraint conditions
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