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Laboratory analysis of carbon dioxide hydrate-bearing sands / Lingyun Wu in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°4 (Avril 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°4 (Avril 2008) . - pp. 547–550 Titre : Laboratory analysis of carbon dioxide hydrate-bearing sands Type de document : texte imprimé Auteurs : Lingyun Wu, Auteur ; Jocelyn L. Grozic, Auteur Année de publication : 2008 Article en page(s) : pp. 547–550 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Natural  gas  Soil  gas  Triaxial  tests  Sand  Carbon  dioxide  Methane  Laboratory  tests Résumé : Gas hydrates are ice-like compounds composed of water molecules that encapsulate natural gas molecules in a very compact form. Three groups of CO2 hydrate-bearing sand specimens were formed using a specialized triaxial test apparatus at different temperature and different pressure to examine the physical effects, such as stress and deformation changes, of hydrate dissociation on the surrounding soil. The triaxial test data indicate: (1) the higher the pressure, the higher hydrate content; (2) the lower the temperature, the higher hydrate content; (3) the greater the amount of gas hydrate initially present in the specimen, the greater the reduction of effective stress upon dissociation and the lower strength; and (4) dissociation of even a small percentage of gas hydrates will cause a dramatic reduction in the soil strength and could lead to failure. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A4%2854 [...] [article] Laboratory analysis of carbon dioxide hydrate-bearing sands [texte imprimé] / Lingyun Wu, Auteur ; Jocelyn L. Grozic, Auteur . - 2008 . - pp. 547–550. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°4 (Avril 2008) . - pp. 547–550 Mots-clés : Natural  gas  Soil  gas  Triaxial  tests  Sand  Carbon  dioxide  Methane  Laboratory  tests Résumé : Gas hydrates are ice-like compounds composed of water molecules that encapsulate natural gas molecules in a very compact form. Three groups of CO2 hydrate-bearing sand specimens were formed using a specialized triaxial test apparatus at different temperature and different pressure to examine the physical effects, such as stress and deformation changes, of hydrate dissociation on the surrounding soil. The triaxial test data indicate: (1) the higher the pressure, the higher hydrate content; (2) the lower the temperature, the higher hydrate content; (3) the greater the amount of gas hydrate initially present in the specimen, the greater the reduction of effective stress upon dissociation and the lower strength; and (4) dissociation of even a small percentage of gas hydrates will cause a dramatic reduction in the soil strength and could lead to failure. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A4%2854 [...]