Critical state soil constitutive model for methane hydrate soil

Uchida, Shun; Soga, Kenichi; Yamamoto, Koji

doi:10.1029/2011jb008661

Cited by 199 publications

(144 citation statements)

References 65 publications

Supporting

Mentioning

132

Contrasting

Unclassified

Order By: Relevance

“…However, the time-dependent behaviors of methane-hydrate-bearing sediments have not been fully clarified, although they are thought to have great significance in predicting the long-term behaviors of sediment over a time scale of decades. Thus, few models consider the time-dependent behaviors of methane-hydrate-bearing sediments appropriately based on experimentally obtained properties [25][26][27], although many constitutive models for methane-hydrate-bearing sediments have been proposed in earlier works [10,11,[28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Relationship between Creep Property and Loading-Rate Dependence of Strength of Artificial Methane-Hydrate-Bearing Toyoura Sand under Triaxial Compression

2017

View full text Add to dashboard Cite

Abstract:Methane hydrate is anticipated to be a promising energy resource. It is essential to consider the mechanical properties of a methane hydrate reservoir to ensure sustainable production, since its mechanical behavior may affect the integrity of the production well, the occurrence of geohazards, and gas productivity. In particular, the creep property of methane-hydrate-bearing sediment is thought to have great significance in the long-term prediction of the mechanical behaviors of a reservoir. In earlier studies, triaxial compression tests were conducted on artificial methane-hydrate-bearing Toyoura sand under three axial-loading conditions, i.e., constant-strain-rate test, constant-stress-rate test, and creep (constant-stress) test. In this paper, the time-dependent properties of the methane-hydrate-bearing Toyoura sand observed in these tests were quantitatively discussed and found to be almost in agreement. The creep life obtained from the creep tests had a reasonably strong correlation with the loading-rate dependencies of strength, obtained from the constant-strain-rate tests and constant-stress-rate tests based on a simple hypothesis. The findings are expected to be used to develop a constitutive model considering the time-dependent behaviors of hydrate-bearing soil in future studies, and to improve the reliability of long-term prediction of the geomechanical response to gas extraction from a reservoir.

show abstract

Section: Introductionmentioning

confidence: 99%

Relationship between Creep Property and Loading-Rate Dependence of Strength of Artificial Methane-Hydrate-Bearing Toyoura Sand under Triaxial Compression

2017

View full text Add to dashboard Cite

show abstract

“…The presence of hydrate has little effect on the critical state friction angle, but causes the more pronounced shear dilation behavior [59,60]. Therefore, the friction angle obtained in this study can be used when predicting the geomechanical failure of the particular class of sediment.…”

Section: Geomechanical Propertiesmentioning

confidence: 99%

“…The presence of hydrate has a pronounced effect on cohesion, where cohesion can be linearly or non-linearly correlated with hydrate saturation (Table 5). For sediment stiffness, Kim [43] presented an empirical relation for Young's modulus of Ulleung Basin sediments based on previous data [28,[59][60][61] as follows:…”

Section: Geomechanical Propertiesmentioning

confidence: 99%

Geomechanical, Hydraulic and Thermal Characteristics of Deep Oceanic Sandy Sediments Recovered during the Second Ulleung Basin Gas Hydrate Expedition

et al. 2016

View full text Add to dashboard Cite

This study investigates the geomechanical, hydraulic and thermal characteristics of natural sandy sediments collected during the Ulleung Basin gas hydrate expedition 2, East Sea, offshore Korea. The studied sediment formation is considered as a potential target reservoir for natural gas production. The sediments contained silt, clay and sand fractions of 21%, 1.3% and 77.7%, respectively, as well as diatomaceous minerals with internal pores. The peak friction angle and critical state (or residual state) friction angle under drained conditions were~26 • and~22 • , respectively. There was minimal or no apparent cohesion intercept. Stress-and strain-dependent elastic moduli, such as tangential modulus and secant modulus, were identified. The sediment stiffness increased with increasing confining stress, but degraded with increasing strain regime. Variations in water permeability with water saturation were obtained by fitting experimental matric suction-water saturation data to the Maulem-van Genuchen model. A significant reduction in thermal conductivity (from~1.4-1.6 to~0.5-0.7 W·m −1 ·K −1 ) was observed when water saturation decreased from 100% to~10%-20%. In addition, the electrical resistance increased quasi-linearly with decreasing water saturation. The geomechanical, hydraulic and thermal properties of the hydrate-free sediments reported herein can be used as the baseline when predicting properties and behavior of the sediments containing hydrates, and when the hydrates dissociate during gas production. The variations in thermal and hydraulic properties with changing water and gas saturation can be used to assess gas production rates from hydrate-bearing deposits. In addition, while depressurization of hydrate-bearing sediments inevitably causes deformation of sediments under drained conditions, the obtained strength and stiffness properties and stress-strain responses of the sedimentary formation under drained loading conditions can be effectively used to assess sediment responses to depressurization to ensure safe gas production operations in this potential target reservoir.

show abstract

“…This assumption is also adopted even after hydrate-bearing soil is loaded during depressurization. Because of this, the constitutive law does not consider stress-relaxation term that accounts for the release of load that has been carried by hydrates as introduced by others ( [32,72]). …”

Section: Hydrate Reservoir Modelmentioning

confidence: 99%

“…[80,46,47]), elasto-plastic (e.g. [32,72,69,39]), and elasto-viscoplastic (e.g. [31]) constitutive models have been proposed in the recent years to model the geomechanical behaviour of gas hydrate-bearing sediments.…”

Section: Introductionmentioning

confidence: 99%

Testing a thermo‐chemo‐hydro‐geomechanical model for gas hydrate‐bearing sediments using triaxial compression laboratory experiments

Gupta

Deusner

Haeckel

et al. 2017

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Natural gas hydrates are considered a potential resource for gas production on industrial scales. Gas hydrates contribute to the strength and stiffness of the hydrate‐bearing sediments. During gas production, the geomechanical stability of the sediment is compromised. Due to the potential geotechnical risks and process management issues, the mechanical behavior of the gas hydrate‐bearing sediments needs to be carefully considered. In this study, we describe a coupling concept that simplifies the mathematical description of the complex interactions occurring during gas production by isolating the effects of sediment deformation and hydrate phase changes. Central to this coupling concept is the assumption that the soil grains form the load‐bearing solid skeleton, while the gas hydrate enhances the mechanical properties of this skeleton. We focus on testing this coupling concept in capturing the overall impact of geomechanics on gas production behavior though numerical simulation of a high‐pressure isotropic compression experiment combined with methane hydrate formation and dissociation. We consider a linear‐elastic stress‐strain relationship because it is uniquely defined and easy to calibrate. Since, in reality, the geomechanical response of the hydrate‐bearing sediment is typically inelastic and is characterized by a significant shear‐volumetric coupling, we control the experiment very carefully in order to keep the sample deformations small and well within the assumptions of poroelasticity. The closely coordinated experimental and numerical procedures enable us to validate the proposed simplified geomechanics‐to‐flow coupling, and set an important precursor toward enhancing our coupled hydro‐geomechanical hydrate reservoir simulator with more suitable elastoplastic constitutive models.

show abstract

Critical state soil constitutive model for methane hydrate soil

Cited by 199 publications

References 65 publications

Relationship between Creep Property and Loading-Rate Dependence of Strength of Artificial Methane-Hydrate-Bearing Toyoura Sand under Triaxial Compression

Relationship between Creep Property and Loading-Rate Dependence of Strength of Artificial Methane-Hydrate-Bearing Toyoura Sand under Triaxial Compression

Geomechanical, Hydraulic and Thermal Characteristics of Deep Oceanic Sandy Sediments Recovered during the Second Ulleung Basin Gas Hydrate Expedition

Testing a thermo‐chemo‐hydro‐geomechanical model for gas hydrate‐bearing sediments using triaxial compression laboratory experiments

Contact Info

Product

Resources

About