Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering - Energy and Geotechnics
Proceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering - Energy and Geotechnics
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第一届越南海洋工程进展研讨会论文集 - 能源和岩土工程
DOI：
10.1007/978-981-13-2306-5_5
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Fonseca J
中科院分区：
文献类型：
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作者：
Fonseca J
在大多数情况下，碳酸盐土壤是生物成因的，包括小生物的骨架体和壳，壳状碳酸盐砂。由于这些土的微观结构复杂，有许多不确定性有关的力学行为，特别是关于他们的高压缩性。除了明显的安全问题，无法预测碳酸盐砂的行为涉及广泛的补救措施，并总是导致严重的时间延迟和增加施工成本。本研究利用三维图像的内部结构的贝壳状碳酸盐砂的压缩下放置在一个小oedometer内的X射线扫描仪。图像首先用于深入了解材料的颗粒尺度特性，然后在组合离散有限元法的框架内虚拟化和模拟土壤微观结构。这项研究有助于更好地了解塑造贝壳碳酸盐砂宏观响应的颗粒尺度现象，这种现象与更常见的研究的陆源硅砂有很大不同。
For the most part, carbonate soils are of biogenic origin comprising skeleton bodies and shells of small organisms, the shelly carbonate sands. Owing to the complex microstructure of these soils, there are many uncertainties related to their mechanical behavior, in particular, regarding their high compressibility. Aside from obvious safety concerns, the inability to predict the behavior of carbonate sands involves extensive remedial measures and leads invariably to severe time delays and increased construction costs. This study makes use of 3D images of the internal structure of a shelly carbonate sand under compression on a small oedometer placed inside an x-ray scanner. The images are first used to gain insights into the grain-scale properties of the material and then the soil microstructure is virtualized and simulated within a framework of combined discrete–finite-element method. This study contributes towards a better understand the grain-scale phenomena shaping the macro response of shelly carbonate sands, which differs considerably from more commonly studied silica sands of terrigeneous origin.