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Type: Journal article
Title: Micromechanically inspired investigation of cemented granular materials: part II - from experiments to modelling and back
Author: Tengattini, A.
Nguyen, G.D.
Viggiani, G.
Einav, I.
Citation: Acta Geotechnica, 2023; 18(1):57-75
Publisher: Springer
Issue Date: 2023
ISSN: 1861-1125
Statement of
Alessandro Tengattini, Giang D. Nguyen, Gioacchino Viggiani, Itai Einav
Abstract: This paper presents an experimental and analytical/numerical study of the mechanics of cemented granular materials (CGMs). This study incorporates both in situ X-ray tomography and regularised finite element simulations, whose combination offers a unique, complementary insight into the multiscale processes that drive the mechanical response of CGMs. Being the second in a set of a two-part contribution, this paper takes advantage of the image analysis tools developed in Part I to quantitatively explore the effects of boundary conditions on grain-scale processes as well as material properties. We reveal, for example, the influence of the degree of cementation on the spatial distribution of damage and suggest the existence of a local ultimate cement size distribution that is independent from the initial cement content. This paper also validates the predictions of a micromechanically inspired constitutive model at three different scales: in terms of the macroscopic response, the mesoscopic emergence of localisation patterns and the evolution of microscale inelastic processes. A unique feature that sets our model apart from previous CGM models is the adoption of only measurable internal variables, capable of representing grain-scale processes such as the damage of cement bridges. Its statistically representative experimental quantification is found to be in good agreement with the model predictions.
Keywords: Cemented granular materials
Constitutive modelling
Description: Published online: 12 April 2022
Rights: Ⓒ The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2022
DOI: 10.1007/s11440-022-01476-x
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Appears in Collections:Civil and Environmental Engineering publications

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