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Three-dimensional DEM investigation of mechanical behaviors of grain-cementing type methane hydrate-bearing sediment
https://orcid.org/http://orcid.org/0000-0002-9578-8552
This study employs the discrete element method (DEM) and the coupled computational fluid dynamics-discrete element method (CFD-DEM) to explore the effects of hydrate cementation and intermediate principal stress on the mechanical behavior of grain-cementing type methane hydrate-bearing sediment (MHBS) under both drained and undrained conditions. The numerical results indicate that the MHBS samples exhibit apparent strain softening due to hydrate cementation. The peak strength of MHBS sample can be predicted by both the modified Lade–Duncan and extended SMP criteria. When the intermediate principal stress coefficient b = 0.4, the response of the MHBS sample is close to the plane strain loading condition, regardless of the drainage condition. Bond breakage in the MHBS sample is greater under drained conditions as compared to undrained conditions. At b = 0, the bonds are destroyed more uniformly and completely due to the larger deviatoric stress and relatively uniform deformation of the sample during shearing. The simulation results may serve for the examination, calibration, or improvement of constitutive models for MHBS.
Three-dimensional DEM investigation of mechanical behaviors of grain-cementing type methane hydrate-bearing sediment
https://orcid.org/http://orcid.org/0000-0002-9578-8552
This study employs the discrete element method (DEM) and the coupled computational fluid dynamics-discrete element method (CFD-DEM) to explore the effects of hydrate cementation and intermediate principal stress on the mechanical behavior of grain-cementing type methane hydrate-bearing sediment (MHBS) under both drained and undrained conditions. The numerical results indicate that the MHBS samples exhibit apparent strain softening due to hydrate cementation. The peak strength of MHBS sample can be predicted by both the modified Lade–Duncan and extended SMP criteria. When the intermediate principal stress coefficient b = 0.4, the response of the MHBS sample is close to the plane strain loading condition, regardless of the drainage condition. Bond breakage in the MHBS sample is greater under drained conditions as compared to undrained conditions. At b = 0, the bonds are destroyed more uniformly and completely due to the larger deviatoric stress and relatively uniform deformation of the sample during shearing. The simulation results may serve for the examination, calibration, or improvement of constitutive models for MHBS.
Three-dimensional DEM investigation of mechanical behaviors of grain-cementing type methane hydrate-bearing sediment
https://orcid.org/http://orcid.org/0000-0002-9578-8552
This study employs the discrete element method (DEM) and the coupled computational fluid dynamics-discrete element method (CFD-DEM) to explore the effects of hydrate cementation and intermediate principal stress on the mechanical behavior of grain-cementing type methane hydrate-bearing sediment (MHBS) under both drained and undrained conditions. The numerical results indicate that the MHBS samples exhibit apparent strain softening due to hydrate cementation. The peak strength of MHBS sample can be predicted by both the modified Lade–Duncan and extended SMP criteria. When the intermediate principal stress coefficient b = 0.4, the response of the MHBS sample is close to the plane strain loading condition, regardless of the drainage condition. Bond breakage in the MHBS sample is greater under drained conditions as compared to undrained conditions. At b = 0, the bonds are destroyed more uniformly and completely due to the larger deviatoric stress and relatively uniform deformation of the sample during shearing. The simulation results may serve for the examination, calibration, or improvement of constitutive models for MHBS.
Three-dimensional DEM investigation of mechanical behaviors of grain-cementing type methane hydrate-bearing sediment
Acta Geotech.
Zhang, An (author) / Jiang, Mingjing (author) / Wang, Dong (author) / Li, Qingping (author)
Acta Geotechnica ; 18 ; 6371-6394
2023-12-01
24 pages
Article (Journal)
Electronic Resource
English
Bond breakage , CFD-DEM , Discrete element method , Intermediate principal stress coefficient , Methane hydrate-bearing sediment , Strength criterion Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics