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Numerical modelling of thermo-active piles in London Clay

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Title: Numerical modelling of thermo-active piles in London Clay
Authors: Gawecka, KA
Taborda, DMG
Potts, DM
Cui, W
Zdravkovic, L
Haji Kasri, M
Item Type: Journal Article
Abstract: Thermo-active foundations utilise heat energy stored in the ground to provide a reliable and effective means of space heating and cooling. Previous studies have shown that the effects of temperature changes on their response are highly dependent on their interaction with the surrounding ground. Consequently, it is necessary to consider this interaction and include both the thermal and mechanical behaviour of the ground in design. This paper addresses this issue by performing state-of-the-art finite-element analyses using the Imperial College Finite Element Program, which is capable of simulating the fully coupled thermo-hydro-mechanical behaviour of porous materials. First, the Lambeth College pile test is analysed to demonstrate the capability of the adopted modelling approach to capture the observed response under thermo-mechanical loading. Subsequently, a detailed study is carried out, demonstrating the impact of capturing the fully coupled thermo-hydro-mechanical response of the ground, the use of appropriate boundary conditions and the uncertainty surrounding thermal ground properties. It is demonstrated that the modelling approach has a large impact on the computed results, and therefore potentially on the design of thermo-active piles. Conversely, the effects of thermal conductivity and permeability of the soil are shown not to influence the pile behaviour significantly.
Issue Date: 8-May-2017
Date of Acceptance: 20-Oct-2016
URI: http://hdl.handle.net/10044/1/41908
DOI: https://dx.doi.org/10.1680/jgeen.16.00096
ISSN: 1353-2618
Publisher: Thomas Telford (ICE Publishing)
Start Page: 201
End Page: 219
Journal / Book Title: Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
Volume: 170
Issue: 3
Copyright Statement: This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Geotechnical Consulting Group
Engineering and Physical Sciences Research Council
Funder's Grant Number: CISM_P60087
1386304
Keywords: Science & Technology
Technology
Physical Sciences
Engineering, Geological
Geosciences, Multidisciplinary
Engineering
Geology
geotechnical engineering
renewable energy
thermal effects
HEAT-EXCHANGER PILE
FINITE-ELEMENT-ANALYSIS
VOLUME CHANGE BEHAVIOR
ENERGY PILES
MECHANICAL-BEHAVIOR
THERMOMECHANICAL BEHAVIOR
TEMPERATURE
FOUNDATIONS
0905 Civil Engineering
Publication Status: Published
Open Access location: http://www.icevirtuallibrary.com/doi/abs/10.1680/jgeen.16.00096
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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