A mechanistic model for porosity and permeability in deformable hydrate-bearing sediments with various hydrate growth patterns

A stress-dependent porosity and permeability model is proposed to predict the microstructure evolution and the physical properties and mechanical behavior of deformable hydrate-bearing sediments (HBS) with various hydrate growth patterns under engineering disturbance. First, according to Hertzian co...

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Bibliographic Details
Published in:Acta geotechnica 2024-02, Vol.19 (2), p.855-880
Main Authors: Zhang, N., Wang, H. N., Jiang, M. J.
Format: Article
Language:English
Subjects:
Cementing
Complex Fluids and Microfluidics
Damage assessment
Deformation
Engineering
Formability
Foundations
Fractal models
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
Growth patterns
Hydrates
Hydraulics
Mechanical properties
Membrane permeability
Microstructure
Permeability
Physical properties
Pore size
Porosity
Research Paper
Sediment
Sediments
Soft and Granular Matter
Soil Science & Conservation
Solid Mechanics
Tungsten carbide
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Summary:A stress-dependent porosity and permeability model is proposed to predict the microstructure evolution and the physical properties and mechanical behavior of deformable hydrate-bearing sediments (HBS) with various hydrate growth patterns under engineering disturbance. First, according to Hertzian contact theory and the proposed mesoelastic–plastic damage model (Gurson-DP model), the correction formula of the pore size under the influence of the effective confining pressure and the overburden pressure is given, and the stress-dependent porosity model is derived. Second, the fractal capillary bundle model is used to describe the stress-dependent permeability of HBS with different hydrate saturations considering the grain-cementing hydrate and the universal-growth hydrate. Finally, the proportions of hydrates with various growth patterns, such as pore filling (PF), wall coating (WC), and grain cementing (GC), are determined based on the equivalent flow assumption to reasonably evaluate the hydrate growth habit in HBS. This paper comprehensively studies the stress-dependent porosity and permeability models of deformable HBS and thus, provides a theoretical basis for quantitative evaluation and prediction of the physical properties (such as porosity and permeability) and mechanical behavior of HBS.
ISSN:1861-1125
1861-1133
DOI:10.1007/s11440-023-01954-w