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dc.contributor.authorSveen, Svein Erik
dc.contributor.authorNguyen, Hung Thanh
dc.contributor.authorSørensen, Bjørn Reidar
dc.date.accessioned2017-03-08T17:41:42Z
dc.date.available2017-03-08T17:41:42Z
dc.date.issued2016-09-22
dc.description.abstractTo facilitate excavation and foundation work in seasonally freezing or permafrost regions, the frozen soil must be thawed, either by natural (solar) thawing, or by artificial thawing where an auxiliary heat source is utilized to accelerate the process. In this paper, the process of rapid thawing of frozen ground subject to hydronic heating is studied. In particular, the performance characteristics of the method is evaluated through full-scale thawing experiments performed on three types of homogenous, initially frozen soils. The results from two separate experiments, carried out during the winter of 2011 and 2012, were compared. The corresponding soil temperature increase, phase change, and variation in water content for each type of soil were monitored. The results from both winter seasons show similar trends, with comparable and considerable higher thaw rates for gravelly sand (∼3.5  days/m∼3.5  days/m) and silty sand (∼4  days/m∼4  days/m) compared with crushed gravel (∼11.5  days/m∼11.5  days/m). Furthermore, thaw rates compiled from thermistor strings in tubes embedded in the ground are overestimated compared with similar temperature readings based on thermocouples in direct contact with the soil.en_US
dc.description.sponsorshipAcknowledgments This study is funded by Nordland County council, the ColdTech project (RT4-01), and Heatwork AS. The authors are grateful for the support in establishing the Frost in Ground laboratory (FiG-lab) and the access to the facilities during this work. The authors also thank Heatwork AS for providing the defrosting system used during the experiments.en_US
dc.descriptionPublishers version: 10.1061/(ASCE)CR.1943-5495.0000117#sthash.J1DbtqlQ.dpufen_US
dc.identifier.citationSveen S, Nguyen HT, Sørensen BR. Thaw Penetration in Frozen Ground Subjected to Hydronic Heating. Journal of cold regions engineering . 2017; 31(1)en_US
dc.identifier.cristinIDFRIDAID 1387105
dc.identifier.doi10.1061/(ASCE)CR.1943-5495.0000117
dc.identifier.issn0887-381X
dc.identifier.issn1943-5495
dc.identifier.urihttps://hdl.handle.net/10037/10495
dc.language.isoengen_US
dc.publisherAmerican Society of Civil Engineers (ASCE)en_US
dc.relation.journalJournal of cold regions engineering
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Teknologi: 500en_US
dc.titleThaw Penetration in Frozen Ground Subjected to Hydronic Heatingen_US
dc.typePeer revieweden_US


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