Evaluation and Comparison of Geomechanical Properties of Hydrate bearing and Frozen Sands
Muhammad Abbas, Jeffrey A Priest, Jocelyn L Hayley
In the proceedings of: GeoEdmonton 2018: 71st Canadian Geotechnical Conference; 13th joint with IAH-CNCSession: Cold Regions and Permafrost Geotechnics II
ABSTRACT: This paper presents a set of experimental results on the geomechanical behavior of artificially synthesized methane gas-saturated hydrate bearing sands (HS), water-saturated hydrate bearing sands (WHS) and frozen sands (FS). HS was formed by injecting methane gas into the pore-space of partially saturated sand under pressure and temperature (PT) conditions that lie within the hydrate stability region. FS specimens were formed by freezing partially saturated sand specimens at -9 oC for 24hrs. The changes in shear modulus during hydrate formation and water-saturation were monitored using a resonant column. Drained triaxial tests were carried out to determine large strain strength characteristics. Both HS and FS exhibited strain-softening behavior. HS gave greater peak strength than FS and showed different deformation characteristics. The hydrate was marginally dissociated in WHS during water-saturation and resulted in a major loss of strength. The findings provide useful new insights into the strength governing mechanisms in HS, WHS and FS.
RÉSUMÉ: Cette étude présente les résultats expérimentaux d’un test géo mécanique sur les hydrates de méthane, synthétisées artificiellement saturées de gaz (HS), les sables saturés d'eau (WHS) et des sables gelés (FS). HS a été formé en injectant le méthane dans l'espace poreux de sable partiellement saturé sous la pression et la température qui caractérisent la région de stabilité les hydrates. Les spécimens FS ont été formés en gelant les spécimens de sable partiellement saturés à-9 oC durant 24hrs. Les changements en module de cisaillement pendant la formation d'hydrate et la saturation d'eau ont été contrôlés en utilisant une colonne résonante. Les essais triaxiaux épuisés/drainés ont été menés afin de déterminer les caractéristique de force des souches des hydrates. HS, tel que FS, ont accusé quelques signes d adoucissement de tension. HS a donné une intensité maximale alors que FS et a montré de différentes caractéristiques de déformation. L'hydrate a été marginalement dissocié du WHS pendant la saturation d’eau, ceci a abouti à une perte majeure de puissance. Les conclusions de notre étude fournissent de nouveaux aperçus et perspectives utiles sur la force dirigeante des mécanismes des HS, WHS et FS.
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Abbas, Muhammad, Priest, Jeffrey A, Hayley, Jocelyn L (2018) Evaluation and Comparison of Geomechanical Properties of Hydrate bearing and Frozen Sands in GEO2018. Ottawa, Ontario: Canadian Geotechnical Society.
@inproceedings{Abbas_GEO2018_577,
author = {{Abbas, Muhammad}, {Priest, Jeffrey A}, {Hayley, Jocelyn L}}
title = {Evaluation and Comparison of Geomechanical Properties of Hydrate bearing and Frozen Sands }
booktitle = {Proceedings of the 71st Canadian Geotechnical Conference; 13th joint with IAH-CNC }
year = {2018}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }
title = {Evaluation and Comparison of Geomechanical Properties of Hydrate bearing and Frozen Sands }
booktitle = {Proceedings of the 71st Canadian Geotechnical Conference; 13th joint with IAH-CNC }
year = {2018}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }