Study on the Thermomechanical Response of Deep Buried Pipe Energy Piles under Temperature Load

Jingquan Wang, Chunxia Chang, Zhi Chen, Henglin Xiao, Bo Wang, Jinjia Tan and Di Hai
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Jingquan Wang: School of Civil Engineering, Hubei University of Technology, Wuhan 430068, China
Chunxia Chang: CCCC Second Highway Consultant Co., Ltd., Wuhan 430056, China
Zhi Chen: School of Civil Engineering, Hubei University of Technology, Wuhan 430068, China
Henglin Xiao: School of Civil Engineering, Hubei University of Technology, Wuhan 430068, China
Bo Wang: School of Civil Engineering, Hubei University of Technology, Wuhan 430068, China
Jinjia Tan: School of Civil Engineering, Hubei University of Technology, Wuhan 430068, China
Di Hai: School of Civil Engineering, Hubei University of Technology, Wuhan 430068, China

Energies, 2022, vol. 15, issue 10, 1-16

Abstract: A deep buried pipe energy pile (DBP-EP) is a composite structure that integrates ground-source heat pump (GSHP) systems and inside buried pipe energy piles (IBP-EP) to effectively achieve the improvement of heat transfer efficiency and quantity. Utilizing this technology in building a pile foundation can contribute to reducing carbon emissions. This paper studies the variation rules of the thermomechanical response of DBP-EP under temperature load via field testing and numerical simulation. The results show that, under heating and cooling conditions, the DBP-EP temperature variation within the pile is substantial, while there is no significant change in the temperature field at the bottom of the pile. This is different from the internal temperature change of the temperature distribution of IBP-EP. The minimum axial average strain of the DBP-EP under the cooling condition is significantly smaller than that under the heating condition. However, the additional axial average strain under the temperature load is significantly larger than that in the heating condition, resulting in larger additional axial stress when the pile is cooled. The connection between the pile and foundation must considered in design due to the large settlement of the pile top under cooling conditions. When only under the temperature load, the maximum axial average pressure increments of the pile in our test during heating and cooling are −85.3 kN/°C and 99.4 kN/°C, respectively, suggesting that the additional load cannot be ignored.

Keywords: deep buried pipe energy pile; field test; numerical simulation; thermomechanical response (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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