Exploring chemo-mechanics of granular material using DEM

Particle Size Distribution (PSD) is one of the prime guiding factors of granular media response. Degradation via weathering is a process, which brings about a gradual shift in the PSD. In nature, chemically sensitive material like calcite undergoes chemo-mechanical degradation bringing about variati...

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Bibliographic Details
Published in:EPJ Web of conferences 2021-01, Vol.249, p.14013
Main Authors: Viswanath, P., Das, Arghya
Format: Article
Language:English
Subjects:
Calcite
Degradation
Discrete element method
Dissolution
Earth pressure
Experiments
Grain size
Granular materials
Granular media
Lateral pressure
Mechanical analysis
Particle size distribution
Pressure molding
Size reduction
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Summary:Particle Size Distribution (PSD) is one of the prime guiding factors of granular media response. Degradation via weathering is a process, which brings about a gradual shift in the PSD. In nature, chemically sensitive material like calcite undergoes chemo-mechanical degradation bringing about variations in their behaviour. In the present study, an experimental investigation is carried out to get insight into the mechanical response during the coupled chemo-mechanical process. The experiments were carried out at two different rates of dissolutions in a custom made 1D compression mould. From the experiments, it is clear that the higher rate of dissolution reduces the lateral earth pressure more than the lower rate. Discrete Element Method (DEM) analyses the micromechanical process behind the observed response from experiments. The results showed a reduction in lateral stress as soon as the dissolution starts. DEM analysis confirms the competing mechanism between grain size reduction and grain rearrangement as the guiding element for the granular media response.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/202124914013