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

Bohan Zhou, Marcelo Sanchez, Luciano Oldecop and J. Carlos Santamarina
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Bohan Zhou: Department of Civil and Environmental Engineering, Texas A&M University, 3136 TAMU, College Station, TX 77843, USA
Marcelo Sanchez: Department of Civil and Environmental Engineering, Texas A&M University, 3136 TAMU, College Station, TX 77843, USA
Luciano Oldecop: Instituto de Investigaciones Antisísmicas “Ing. Aldo Bruschi”, Facultad de Ingeniería, Universidad Nacional de San Juan, San Juan 5402, Argentina
J. Carlos Santamarina: Earth Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia

Energies, 2022, vol. 15, issue 12, 1-23

Abstract: 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.

Keywords: methane hydrate bearing sediments; geomechanical model; high-dilatancy temperature; rate effects; model validation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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