A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms
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. Here 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 mechanicalmore »
- Authors:
-
- Texas A & M University, College Station, TX (United States)
- King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia)
- Publication Date:
- Research Org.:
- Texas A & M Univ., College Station, TX (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1533678
- Alternate Identifier(s):
- OSTI ID: 1396857
- Grant/Contract Number:
- FE0013889
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Computers and Geotechnics
- Additional Journal Information:
- Journal Volume: 84; Journal Issue: C; Journal ID: ISSN 0266-352X
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; 97 MATHEMATICS AND COMPUTING; 42 ENGINEERING; methane hydrate; geomechanical behavior; damage; elastoplasticity; model application
Citation Formats
Sánchez, Marcelo, Gai, Xuerui, and Santamarina, J. Carlos. A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms. United States: N. p., 2016.
Web. doi:10.1016/j.compgeo.2016.11.012.
Sánchez, Marcelo, Gai, Xuerui, & Santamarina, J. Carlos. A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms. United States. https://doi.org/10.1016/j.compgeo.2016.11.012
Sánchez, Marcelo, Gai, Xuerui, and Santamarina, J. Carlos. Wed .
"A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms". United States. https://doi.org/10.1016/j.compgeo.2016.11.012. https://www.osti.gov/servlets/purl/1533678.
@article{osti_1533678,
title = {A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms},
author = {Sánchez, Marcelo and Gai, Xuerui and Santamarina, J. Carlos},
abstractNote = {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. Here 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.},
doi = {10.1016/j.compgeo.2016.11.012},
journal = {Computers and Geotechnics},
number = C,
volume = 84,
place = {United States},
year = {Wed Nov 30 00:00:00 EST 2016},
month = {Wed Nov 30 00:00:00 EST 2016}
}
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