Long-term mechanical performance of geothermal diaphragm walls in stiff clay

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dc.contributor.authorDai, Quanwei
dc.contributor.authorLi, Zili
dc.contributor.funderNational Natural Science Foundation of Chinaen
dc.contributor.funderUniversity College Corken
dc.contributor.funderEuropean Cooperation in Science and Technologyen
dc.date.accessioned2019-09-26T08:59:46Z
dc.date.available2019-09-26T08:59:46Z
dc.date.issued2019-09-16
dc.date.updated2019-09-26T08:48:04Z
dc.description.abstractDiaphragm wall equipped with ground heat exchangers is one type of thermo-active foundations, which harness the energy stored by the ground for heating and/or cooling buildings. Past investigations on geothermal diaphragm walls mainly focused on the thermal performance, but paid little attention on their mechanical response to geothermal energy operation. This paper conducts thermo-hydro-mechanical (THM) finite element analyses to investigate the long-term performance of geothermal diaphragm walls in stiff clay. The numerical analyses take account of both the station excavation process in short-term and long-term behaviour of the diaphragm wall. The long-term soil-structure interaction simulation includes three scenarios, examining the effects of ground consolidation, external thermal solicitations and seasonal geothermal operation, respectively. A comparison between the mechanical behaviour of the geothermal diaphragm wall and that of the same wall without geothermal activation indicates that geothermal operation may have an impact on structural serviceability issues (e.g. thermal-induced concrete cracks) although unlikely cause critical safety problems. In particularly, the ground settlement near the station is very sensitive to the stiffness degradation of the stiff clay during geothermal operation, while specific attention should be given to the structural performance at the connections between the wall and slabs due to thermo-induced additional stress concentration.en
dc.description.sponsorshipEuropean Cooperation in Science and Technology (Transport and Urban Development COST Action GABI TU1405); National Natural Science Foundation of China (Grant No. 51978530)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid103113en
dc.identifier.citationDai, Q. and Li, Z. (2019) 'Long-term mechanical performance of geothermal diaphragm walls in stiff clay', Tunnelling and Underground Space Technology, 94, 103113 (21pp). doi: 10.1016/j.tust.2019.103113en
dc.identifier.doi10.1016/j.tust.2019.103113en
dc.identifier.endpage21en
dc.identifier.issn0886-7798
dc.identifier.journaltitleTunnelling and Underground Space Technologyen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/8620
dc.identifier.volume94en
dc.language.isoenen
dc.publisherElsevier Ltd.en
dc.relation.urihttp://www.sciencedirect.com/science/article/pii/S0886779819304663
dc.rights© 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectGeothermal foundationen
dc.subjectDiaphragm wallen
dc.subjectLong-term mechanical behaviouren
dc.subjectLong-term ground settlementen
dc.subjectThermo-hydro-mechanical analysisen
dc.titleLong-term mechanical performance of geothermal diaphragm walls in stiff clayen
dc.typeArticle (peer-reviewed)en
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