City Research Online

Image based simulation of one-dimensional compression tests on carbonate sand

Nadimi, S. & Fonseca, J. ORCID: 0000-0002-7654-6005 (2019). Image based simulation of one-dimensional compression tests on carbonate sand. In: Micro to MACRO Mathematical Modelling in Soil Mechanics. micro to MACRO Mathematical Modelling in Soil Mechanics, 29 May - 1 Jun 2018, Calabria, Italy.


High factors of safety and conservative methods are commonly used on foundation design on shelly carbonate soils. A better understanding of the behavior of this material is, thus, critical for more sustainable approaches for the design of a number of offshore structures and submarine pipelines. In particular, understanding the physical phenomena taking place at the microscale has the potential to spur the development of robust computational methods. In this study, a series of one-dimensional compression tests were performed inside an X-ray scanner to obtain 3D images of the evolving internal structure of a shelly carbonate sand. A preliminary inspection of the images through five loading increments has shown that the grains rearrange under loading and in some cases cracks develop at the contacts. In order to replicate of the experiments in the numerical domain, the 3D image of the soil prior to loading was imported into a micro Finite Element (µFE) framework. This image-based modelling tool enables measurements of the contact force and stress map inside the grains while making use of the real microstructure of the soil. The potential of the µFE model to contribute insights into yield initiation within the grain is demonstrated here. This is of particular interest to better understand the breakage of shelly grains underpinning their highly compressive behavior.

Publication Type: Conference or Workshop Item (Paper)
Subjects: Q Science > QA Mathematics
T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Science & Technology > Engineering
[thumbnail of ID10SNJF.pdf]
Text - Accepted Version
Available under License Creative Commons: Attribution International Public License 4.0.

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