Mechanical Behavior of Methane–Hydrate–Bearing Sand with Nonlinear Constitutive Model

Interests appear in investigating methane-hydrate-bearing sands (MHBS) to address engineering problems, such as foundation instability of man-made permafrost facilities, wellbore instability and sanding during production. Mechanical behavior of MHBS is critical issue to analyze geomechanical hazards...

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Bibliographic Details
Published in:Arabian journal for science and engineering (2011) 2022-09, Vol.47 (9), p.12141-12167
Main Authors: Zhu, Haiyan, Tang, Xuanhe, Zhang, Fengshou, McLennan, John David
Format: Article
Language:English
Subjects:
Compressive strength
Confining
Constitutive models
Dilatancy
Discrete element method
Engineering
Geomechanics
Heterogeneity
Humanities and Social Sciences
Hydrates
Mathematical models
Mechanical analysis
Mechanical properties
Methane
multidisciplinary
Particle size
Performance prediction
Permafrost
Plastic deformation
Research Article-Petroleum Engineering
Sanding
Saturation
Science
Stress-strain curves
Structural stability
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Summary:Interests appear in investigating methane-hydrate-bearing sands (MHBS) to address engineering problems, such as foundation instability of man-made permafrost facilities, wellbore instability and sanding during production. Mechanical behavior of MHBS is critical issue to analyze geomechanical hazards. In this paper, MHBS is synthesized in laboratory and triaxial compressive tests are carried out to capture mechanical response. A discrete element method (DEM) model is developed to examine mechanical responses of MHBS by considering real MHBS-based microstructure and particles contact. To describe nonlinear mechanical behavior, Duncan–Chang model is embedded into DEM model and verified with experimental results. Triaxial drained and undrained numerical tests are carried out to investigate effects of hydrate saturation, confining stress, heterogeneity and grading properties on mechanical behavior of pore-filling hydrate sediment. Experimental and numerical results indicate that (1) triaxial compression strength increases with confining stress and hydrate saturation; (2) stress–strain curve becomes smooth at a higher hydrate saturation thanks to the stability enhancement of MHBS structure; (3) heterogeneous distribution of hydrates leads to local instability with non-bonded hydrate particles; (4) grading properties (uniformity coefficient and mean particle diameter) non-apparent influence on compressive strength and dilatancy due to particles re-distribution; and (5) MHBS presents mechanical behavior of brittleness or plasticity in undrained tests rather than strain softening in drained tests. Except for Duncan–Chang model parameters fitting in this work, more experimental and numerical researches are expected to improve the performance in predicting post-failure behavior.
ISSN:2193-567X
1319-8025
2191-4281
DOI:10.1007/s13369-022-06914-2