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A cohesionless micromechanical model for gas hydrate-bearing sediments

机译：气体水合物沉积物的粘性微机械模型

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摘要

Proper representation and understanding of the mechanical response of the sediment is a prerequisite for successful future gas production from gas hydrate-bearing sediments, in view of the geotechnical issues encountered in recent field trials. Recent investigations have indicated that the increase of sediment strength, due to hydrate existence, is of frictional nature and associated with changes in the kinematic response, and not necessarily due to cementation. Following this idea, this paper presents a non-cohesive micro model for methane-hydrate-bearing sediments, where the hydrate is represented as solid particles precisely positioned between sand particles, contributing to the skeleton response even for small strains. Analytical expressions relating between the geometry, inter-particle properties, and the mechanical response of the hydrate-bearing sediment are developed in the paper. Global stress-strain response is evaluated under simulated triaxial loading, exhibiting stiffer, stronger and more dilative response compared to pure sand samples. It is shown that a trade-off exists between the particle size and the inter-particle friction, which can be unified using a participation factor related to the pore size distribution. As observed in recent experimental investigations, the suggested model results in a cohesionless response when analyzed using Rowe's stress dilatancy theory.
机译：鉴于最近的实地试验中遇到的岩土问题，对沉积物的机械响应是对沉积物的机械响应的适当的表示和理解是一种从煤气水合物沉积物的成功生产的先决条件。最近的调查表明，由于水合物存在，沉积物强度的增加是摩擦性质，与运动反应的变化相关，而不一定是由于胶结。在此思想之后，本文介绍了甲烷 - 水合物沉积物的非粘性微型模型，其中水合物表示为在砂颗粒之间精确定位的固体颗粒，即使对于小菌株也有助于骨架反应。在纸上开发了几何形状，颗粒性能与水合物沉积物的机械响应之间的分析表达。与纯砂样品相比，在模拟三轴载荷下，表现出静止的三轴载荷，表现出更硬，更强，更扩张的反应，评估全局应力应变响应。结果表明，在粒度和颗粒间摩擦之间存在权衡，这可以使用与孔径分布有关的参与因子统一。如最近的实验研究所观察到的，建议的模型在使用Rowe的应力膨胀理论分析时导致粘合响应。

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