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In-Situ Thermomechanical Response Test of an Energy Pile Under Temperature Loading

  • Research Article-Civil Engineering
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Abstract

The energy pile is a building energy-saving technology that uses shallow geothermal energy. It has the advantages of higher heat-transfer efficiency and lower land requirements than a traditional ground source heat pump system. The thermomechanical response characteristics of an energy pile under cooling and heating conditions were studied. An in-situ test of the cast-in-place energy pile was used to carry out the cooling, recovery, and heating stages. Based on analysis of the stress–strain distribution characteristics and the variation law of shaft friction under the conditions of temperature load and pile restraint, the results showed that the strain distribution of the cross section at a given depth in the pile was uniform and that there was no obvious eccentric stress in the vertical pile loading. The thermally induced axial stress had a linear relationship with temperature change, and the soil around the pile and the constraint conditions at the top or toe of the pile have an impact on the location of the maximum thermally induced load. According to calculations at a ± 10 °C temperature difference, the maximum stress can reach 1.79 MPa during cooling and 1.46 MPa during heating. The variation of unit temperature in each depth range causes shaft friction to become more uniform, and shaft friction increases almost linearly with temperature.

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I, the corresponding author, confirm that all of the content, figures (drawings, charts, photographs, etc.), and tables in the submitted work are either original work created by the authors listed on the manuscript or work for which permission to re-use has been obtained from the creator. The data used to support the findings of this study are available from the corresponding author upon request, and the readers can access the data supporting the conclusions of the study.

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Acknowledgements

This research was funded by National Natural Science Foundation of China (NSFC) (No. 51808203), Major Technological Innovation Projects of Hubei (No. 2017AAA128), Youth Science and Technology Research Program of Hubei Education Department (No. Q20181405).

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Authors and Affiliations

  1. Department of Road and Bridge Engineering, School of Civil Engineering and Architecture, Hubei University of Technology, Wuhan, 430068, People’s Republic of China

    Zhi Chen, Yang Sun, Henglin Xiao & Qiang Ma

  2. Railway Siyuan (Hubei) Engineering Supervision Consulting Co., Ltd, Wuhan, 430063, People’s Republic of China

    Liangguo Zhang

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  1. Zhi Chen
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Correspondence to Zhi Chen.

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I, the corresponding author, am responsible for coauthors declaring their interests, and I declare that there is no conflict of interest regarding the publication of this article.

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Chen, Z., Sun, Y., Xiao, H. et al. In-Situ Thermomechanical Response Test of an Energy Pile Under Temperature Loading. Arab J Sci Eng 46, 10355–10364 (2021). https://doi.org/10.1007/s13369-021-05346-8

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  • DOI: https://doi.org/10.1007/s13369-021-05346-8

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