A novel method for designing thermo-active retaining walls using two dimensional analyses

Title: A novel method for designing thermo-active retaining walls using two dimensional analyses
Authors: Sailer, E
Taborda, D
Zdravkovic, L
Potts, DM
Item Type: Journal Article
Abstract: Thermo-active retaining walls are geotechnical structures employed as heat exchangers to provide low carbon dioxide heating and cooling to buildings. To assess the thermo-mechanical response of such structures, finite-element (FE) analyses are typically carried out. Due to the presence of heat exchanger pipes, the temperature distribution along the width of the wall is not uniform, implying that these problems are three-dimensional (3D) in nature. However, performing 3D FE analyses including elements to model the heat exchanger pipes to simulate the advective conductive heat transfer as well as thermo-hydro-mechanical coupling to reproduce the non-isothermal soil response accurately requires considerable computational effort. In this work, a novel approach to simulate thermo-active walls in 2D analyses was developed, which requires the sole use of thermal boundary conditions. This approach was found to reproduce average wall behaviour computed in 3D to a high degree of accuracy for numerous wall geometries, a wide range of thermal properties of soil and concrete, and different thermal boundary conditions along the exposed face of the wall. In addition, out-of-plane effects recorded in 3D analyses were assessed and an accurate simplified procedure to account for these when performing 2D analyses was developed.
Issue Date: 1-Jun-2022
Date of Acceptance: 11-Mar-2020
URI: http://hdl.handle.net/10044/1/78758
DOI: 10.1680/jgeen.19.00291
ISSN: 1353-2618
Publisher: Thomas Telford
Start Page: 289
End Page: 310
Journal / Book Title: Proceedings of the Institution of Civil Engineers: Geotechnical Engineering
Volume: 175
Issue: 3
Copyright Statement: © ICE Publishing, all rights reserved.
Sponsor/Funder: Department of Civil and Environmental Engineering
Geotechnical Consulting Group LLP
Funder's Grant Number: CISM_P60087
Keywords: Science & Technology
Technology
Physical Sciences
Engineering, Geological
Geosciences, Multidisciplinary
Engineering
Geology
geotechnical engineering
retaining walls
thermal effects
FINITE-ELEMENT FORMULATION
MECHANICAL-BEHAVIOR
TRANSIENT
LONDON
0503 Soil Sciences
0905 Civil Engineering
Publication Status: Published
Online Publication Date: 2020-12-16
Appears in Collections:Civil and Environmental Engineering
Faculty of Engineering