弱固结颗粒充填体无侧限强度的数值表征及其对流体驱动断裂行为的影响
A numerical characterisation of unconfined strength of weakly consolidated granular packs and its effect on fluid-driven fracture behaviour
摘要：
软砂或弱固结砂是指由颗粒（或颗粒）组成的多孔材料，这些颗粒（或颗粒）弱结合在一起形成固体，但在受到应力时很容易破碎。这些材料不表现为传统的脆性，线性弹性材料和这两个制度之间的过渡通常不能使用多孔弹性模型来描述。此外，传统的岩土取样技术往往会破坏胶结作用，因此很难回收足够完整的岩心。本文研究了一个数值模型，使我们能够引入弱固结颗粒填料。该模型基于LIGGSTIM开源项目，只是简单地为接触的粒子添加了一个有吸引力的贡献。这个简单的模型使我们能够再现在压实的砂和粘土中以及在固结不良的砂岩中观察到的应力行为的关键要素。本文最后通过检查不同的固结水平的影响，在流体驱动的断裂行为。数值结果与生物胶结砂岩的实验结果进行了比较。
英文摘要：
Soft or weakly-consolidated sand refers to porous materials composed of particles (or grains) weakly held together to form a solid but that can be easily broken when subjected to stress. These materials do not behave as conventional brittle, linear elastic materials and the transition between these two regimes cannot usually be described using poro-elastic models. Furthermore, conventional geotechnical sampling techniques often result in the destruction of the cementation and recovery of sufficient intact core is, therefore, difficult. This paper studies a numerical model that allows us to introduce weak consolidation in granular packs. The model, based on the LIGGGHTS open source project, simply adds an attractive contribution to particles in contact. This simple model allow us to reproduce key elements of the behaviour of the stress observed in compacted sands and clay, as well as in poorly consolidated sandstones. The paper finishes by inspecting the effect of different consolidation levels in fluid-driven fracture behaviour. Numerical results are compared against experimental results on bio-cemented sandstones.
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