A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms

Handle URI:
http://hdl.handle.net/10754/622162
Title:
A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms
Authors:
Sánchez, Marcelo; Gai, Xuerui; Santamarina, Carlos ( 0000-0001-8708-2827 )
Abstract:
Gas hydrate bearing sediments (HBS) are natural soils formed in permafrost and sub-marine settings where the temperature and pressure conditions are such that gas hydrates are stable. If these conditions shift from the hydrate stability zone, hydrates dissociate and move from the solid to the gas phase. Hydrate dissociation is accompanied by significant changes in sediment structure and strongly affects its mechanical behavior (e.g., sediment stiffenss, strength and dilatancy). The mechanical behavior of HBS is very complex and its modeling poses great challenges. This paper presents a new geomechanical model for hydrate bearing sediments. The model incorporates the concept of partition stress, plus a number of inelastic mechanisms proposed to capture the complex behavior of this type of soil. This constitutive model is especially well suited to simulate the behavior of HBS upon dissociation. The model was applied and validated against experimental data from triaxial and oedometric tests conducted on manufactured and natural specimens involving different hydrate saturation, hydrate morphology, and confinement conditions. Particular attention was paid to model the HBS behavior during hydrate dissociation under loading. The model performance was highly satisfactory in all the cases studied. It managed to properly capture the main features of HBS mechanical behavior and it also assisted to interpret the behavior of this type of sediment under different loading and hydrate conditions.
KAUST Department:
Earth Science and Engineering Program
Citation:
Sánchez M, Gai X, Santamarina JC (2017) A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms. Computers and Geotechnics 84: 28–46. Available: http://dx.doi.org/10.1016/j.compgeo.2016.11.012.
Publisher:
Elsevier BV
Journal:
Computers and Geotechnics
Issue Date:
30-Nov-2016
DOI:
10.1016/j.compgeo.2016.11.012
Type:
Article
ISSN:
0266-352X
Sponsors:
The authors would like to acknowledge the financial support from NETL (National Energy Technology Laboratory), DOE, USA, through Award No.: DE-FE0013889. The authors would like to gratefully acknowledge Dr. Ajay Shastri for his involvement in the initial developments associated with this model and also Miss Maria De La Fuente for the fruitful discussions.
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0266352X16302889
Appears in Collections:
Articles; Earth Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorSánchez, Marceloen
dc.contributor.authorGai, Xueruien
dc.contributor.authorSantamarina, Carlosen
dc.date.accessioned2017-01-02T08:42:35Z-
dc.date.available2017-01-02T08:42:35Z-
dc.date.issued2016-11-30en
dc.identifier.citationSánchez M, Gai X, Santamarina JC (2017) A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms. Computers and Geotechnics 84: 28–46. Available: http://dx.doi.org/10.1016/j.compgeo.2016.11.012.en
dc.identifier.issn0266-352Xen
dc.identifier.doi10.1016/j.compgeo.2016.11.012en
dc.identifier.urihttp://hdl.handle.net/10754/622162-
dc.description.abstractGas hydrate bearing sediments (HBS) are natural soils formed in permafrost and sub-marine settings where the temperature and pressure conditions are such that gas hydrates are stable. If these conditions shift from the hydrate stability zone, hydrates dissociate and move from the solid to the gas phase. Hydrate dissociation is accompanied by significant changes in sediment structure and strongly affects its mechanical behavior (e.g., sediment stiffenss, strength and dilatancy). The mechanical behavior of HBS is very complex and its modeling poses great challenges. This paper presents a new geomechanical model for hydrate bearing sediments. The model incorporates the concept of partition stress, plus a number of inelastic mechanisms proposed to capture the complex behavior of this type of soil. This constitutive model is especially well suited to simulate the behavior of HBS upon dissociation. The model was applied and validated against experimental data from triaxial and oedometric tests conducted on manufactured and natural specimens involving different hydrate saturation, hydrate morphology, and confinement conditions. Particular attention was paid to model the HBS behavior during hydrate dissociation under loading. The model performance was highly satisfactory in all the cases studied. It managed to properly capture the main features of HBS mechanical behavior and it also assisted to interpret the behavior of this type of sediment under different loading and hydrate conditions.en
dc.description.sponsorshipThe authors would like to acknowledge the financial support from NETL (National Energy Technology Laboratory), DOE, USA, through Award No.: DE-FE0013889. The authors would like to gratefully acknowledge Dr. Ajay Shastri for his involvement in the initial developments associated with this model and also Miss Maria De La Fuente for the fruitful discussions.en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0266352X16302889en
dc.subjectMethane hydrateen
dc.subjectGeomechanical behavioren
dc.subjectDamageen
dc.subjectElastoplasticityen
dc.subjectModel applicationen
dc.titleA constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanismsen
dc.typeArticleen
dc.contributor.departmentEarth Science and Engineering Programen
dc.identifier.journalComputers and Geotechnicsen
dc.contributor.institutionZachry Department of Civil Engineering, Texas A&M University, College Station, USAen
kaust.authorSantamarina, Carlosen
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