A Geomechanical Model for Gas Hydrate Bearing Sediments Incorporating High Dilatancy, Temperature, and Rate Effects

The geomechanical behavior of methane hydrate bearing sediments (MHBS) is influenced by many factors, including temperature, fluid pressure, hydrate saturation, stress level, and strain rate. The paper presents a visco-elastoplastic constitutive model for MHBS based on an elastoplastic model that in...

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Bibliographic Details
Published in:Energies
Main Authors: Bohan Zhou, Marcelo Sanchez, Luciano Oldecop, J. Carlos Santamarina
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2022
Subjects:
methane hydrate bearing sediments
geomechanical model
high-dilatancy temperature
rate effects
model validation
Technology
T
Methane hydrate
Online Access:https://doi.org/10.3390/en15124280
https://doaj.org/article/ffd4dc30c2d04d009b07cc85bb7900e8
Description
Summary:The geomechanical behavior of methane hydrate bearing sediments (MHBS) is influenced by many factors, including temperature, fluid pressure, hydrate saturation, stress level, and strain rate. The paper presents a visco-elastoplastic constitutive model for MHBS based on an elastoplastic model that incorporates the effect of hydrate saturation, stress history, and hydrate morphology on hydrate sediment response. The upgraded model is able to account for additional critical features of MHBS behavior, such as, high-dilatancy, temperature, and rate effects. The main components and the mathematical formulation of the new constitutive model are described in detail. The upgraded model is validated using published triaxial tests involving MHBS. The model agrees overly well with the experimental observations and is able to capture the main features associated with the behavior of MHBS.

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