passive construction methods in permafrost
Link: http://w3id.org/permafrost/v/ipaglossary/t0231
Within: IPA Permafrost Glossary
Definition: Special design and construction methods used for engineering works in permafrost areas where preservation of the frozen condition is feasible.
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passive construction methods in permafrost
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Passive methods should maintain the foundation materials in a frozen state. Preservation of the frozen condition or permafrost aggradation can be accomplished using thermal piles or thermosyphons, or by using either a ventilation or an insulation construction technique; often a combination of these techniques is used. The ventilation technique requires that there is a clear space left between the bottom of the structure and the ground surface, or that the structure is placed on a fill pad with ventilation ducts incorporated in the pad or the floor system.Movement of cold air through the air space or ducts dissipates heat from the structure above and removes heat from the ground below. Using the insulation technique, a relatively thick fill (sometimes containing a layer of insulation) is placed on the ground surface to prevent thawing or to reduce or control the depth of thaw below the original ground surface.
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| dcterms:source |
https://doi.org/10.4224/20386561
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