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A practical method for calculating thermally-induced stresses in pile foundations used as heat exchangers

Title: A practical method for calculating thermally-induced stresses in pile foundations used as heat exchangers
Authors: Liu, R
Sailer, E
Taborda, D
Potts, D
Zdravkovic, L
Item Type: Journal Article
Abstract: Thermo-active piles are capable of providing both structural stability as foundations and low carbon heating and cooling as ground source heat exchangers. When subjected to heating or cooling, the soil surrounding the pile restricts its expansion or contraction, giving rise to thermally-induced axial stresses, which need to be considered during design. Previous numerical studies often assume axisymmetry of the problem and/or a simplification of the heating or cooling mechanism of the pile. To simulate accurately the development of thermallyinduced axial stresses, this paper presents a computational study comprising three dimensional fully coupled thermo-hydro-mechanical finite element analyses conducted using the Imperial College Finite Element Program (ICFEP), where the heating of a thermo-active pile is simulated by prescribing a flow of hot water through the heat exchanger pipes within the pile. The effects of pipe arrangement on thermally-induced axial stresses are investigated by considering three different cases – single U loop, double U-loop and triple U-loop. Since threedimensional analyses are computationally expensive, a simplified method using a combination of two-dimensional analyses is proposed to estimate the thermally-induced axial stresses, which is subsequently validated and shown to yield accurate results.
Issue Date: Oct-2020
Date of Acceptance: 7-Jul-2020
URI: http://hdl.handle.net/10044/1/80779
DOI: 10.1016/j.compgeo.2020.103743
ISSN: 0266-352X
Publisher: Elsevier
Start Page: 1
End Page: 16
Journal / Book Title: Computers and Geotechnics
Volume: 126
Copyright Statement: © 2020 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Department of Civil and Environmental Engineering
Imperial College London
Geotechnical Consulting Group
Funder's Grant Number: President's Award
CISM_P60087
Keywords: Geological & Geomatics Engineering
0905 Civil Engineering
0914 Resources Engineering and Extractive Metallurgy
0915 Interdisciplinary Engineering
Publication Status: Published online
Online Publication Date: 2020-07-28
Appears in Collections:Civil and Environmental Engineering
Geotechnics
Faculty of Engineering



This item is licensed under a Creative Commons License Creative Commons