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Influence of hydrate participation on the mechanical behaviour of fine-grained sediments under one-dimensional compression: a DEM study
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Influence of hydrate participation on the mechanical behaviour of fine-grained sediments under one-dimensional compression: a DEM study
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Journal Article
Influence of hydrate participation on the mechanical behaviour of fine-grained sediments under one-dimensional compression: a DEM study
2022
Overview
The gas hydrates in the pore space constitutionally affect the mechanical properties of gas hydrate-bearing sediments. The hydrates contribute to the mechanical properties of hydrate-bearing sediments by densifying, bearing and bonding effects. A discrete element model of hydrate-bearing silt was established by randomly filling hydrate particles into a silt-sized granular skeleton reservoir. Three ideal types of hydrate-bearing silt, namely, distributed particulate hydrate-bearing silt (type I), cluster hydrate-bearing silt (type II) and cemented cluster hydrate-bearing silt (type III) are proposed to study the mechanical effects of hydrate. One-dimensional loading (oedometer test) was applied to the numerical sample to investigate its stress evolution, volume change, bond degradation, coordination condition and stress transmission. The main conclusions are as follows. Type III sample exhibits a convex stress path due to bonding and then the stress path gradually returns to the pseudo linear stress path of type I sample due to bond breakage. The compression curve for the type II or type III sample exhibits a structural yield stress, which corresponds to abrupt bond breakage; the compression curves for types I, II and III evolve to be approximately coincident with each other at the end of compression. The average coordination number Z in type II or type III is approximately constant before widespread bond breakage, and then it will evolve to the curve of type I; the inflexion stress of the coordination numbers corresponds to the structural yield stress. The greatest magnitude of the mean stress bearing by hydrates in type II or type III sample is near the structural yield stress; the mean stresses ps - hb and ph - hb (created by bonded silt-hydrate and hydrate-hydrate contacts, respectively) in type III sample first increase under compression and then decrease due to widespread bond breakage, and they are exceeded by ps - hu and ph - hu (created by unbonded silt-hydrate and hydrate-hydrate contacts, respectively) after reaching the structural yield stress.
Publisher
Springer Nature B.V
Subject
