A state-dependent constitutive model for methane hydrate-bearing sediments inside the stability region
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F20%3A10406300" target="_blank" >RIV/00216208:11310/20:10406300 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=k._JYxgLTy" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=k._JYxgLTy</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1680/jgeot.18.P.143" target="_blank" >10.1680/jgeot.18.P.143</a>
Alternative languages
Result language
angličtina
Original language name
A state-dependent constitutive model for methane hydrate-bearing sediments inside the stability region
Original language description
The presence of methane hydrate in soil pores alters the stress-strain and volumetric behaviour of soil. The extent of this alteration is affected by initial temperature and pore pressure when hydrate is formed inside the thermodynamically stable region. In this paper, a state-dependent critical state model is developed for methane hydrate-bearing sediments (MHBS) within the theoretical framework of bounding surface plasticity. A phase parameter is newly introduced into the constitutive model to account for the coupled effects of temperature and pore pressure on the mechanical behaviour of MHBS. This unique feature of the proposed model enables it to capture the behaviour of MHBS inside the methane hydrate stability region. A non-associated flow rule is adopted and a modified dilatancy expression is proposed considering the degree of hydrate saturation, phase parameter and stress state of MHBS. To verify the new model, computed results are compared to measured results of drained triaxial tests on MHBS with different morphologies and at different effective confining stresses, degrees of hydrate saturation and phase states inside the stability region. The comparison reveals that the model is capable of capturing the key features such as the evident strain-softening behaviour due to hydrate degradation and the change in stress-strain and volumetric behaviour of MHBS at different initial conditions inside the stability region.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10505 - Geology
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geotechnique
ISSN
0016-8505
e-ISSN
1751-7656
Volume of the periodical
70
Issue of the periodical within the volume
12
Country of publishing house
GB - UNITED KINGDOM
Number of pages
15
Pages from-to
1094-1108
UT code for WoS article
000591769700002
EID of the result in the Scopus database
2-s2.0-85096341993