The relevance of roundness to the crushing strength of granular materials

Cavarretta, I.; O’Sullivan, Catherine; Coop, M. R.

doi:10.1680/jgeot.15.p.226

Cited by 53 publications

(12 citation statements)

References 31 publications

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“…Particle shape has well-known effects on the characteristics of granular soils including packing density (Cho et al 2006;Shin and Santamarina 2013;Zheng and Hryciw 2016) and fabric (Maeda et al 2010;Turner et al 2016;Zhao and Zhou 2017), and also can have significant effects on mechanical properties like compressibility (Rousé et al 2008;Shin and Santamarina 2013;Gong and Liu 2017), shear modulus (Cho et al 2006;Shin and Santamarina 2013), shear strength (Varadarajan et al 2003;Guo and Su 2007;Rousé et al 2008;Yang and Wei 2012;Shin and Santamarina 2013;Yang and Luo 2015;Xiao et al 2019), dilation (Guo and Su 2007;Yang and Luo 2015;Xiao et al 2019), susceptibility to liquefaction (Tsomokos and Georgiannou 2010;Yang and Wei 2012; and Luo 2015), particle breakage during shearing (Afshar et al 2017;Cavarretta et al 2017), and failure mode during shearing (Alshibli et al 2017). Particle shape may also affect the hydraulic conductivity of granular soils (Côté et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Granular Soil Mixtures with Contrasting Particle Shapes

Xiao

Nan

et al. 2020

J. Geotech. Geoenviron. Eng.

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Particle shape is known to affect the mechanical behavior of sands as it influences packing density and particle contacts. Even though the thermal conductivity of sands also depends on packing density and particle contacts, the effects of particle shape on thermal conductivity are not well understood. A series of thermal needle tests were conducted on five granular soil mixtures with different proportions of rounded and angular glass particles having the same mineral composition and gradation. The maximum and minimum void ratios and the packing density of these mixtures were found to depend on the overall regularity, defined as the average value of the particle's aspect ratio, convexity and sphericity. For a given overall regularity, the thermal conductivity increases with decreasing void ratio or increasing relative density. Interestingly, the overall regularity has a small effect on the thermal conductivity at a given void ratio but has a significant effect on the thermal conductivity at a given relative density. A particle shape-dependent empirical equation is proposed to quantify the effects of relative density and overall regularity on the thermal conductivity of the tested sand.

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Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Granular Soil Mixtures with Contrasting Particle Shapes

Xiao

Nan

et al. 2020

J. Geotech. Geoenviron. Eng.

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“…The fracture of sand particles plays a significant role in determining the plastic bulk volume changes of granular materials under different loading conditions. Particle breakage has been investigated using experimental, analytical, and numerical approaches at different scales ranging from a single particle to laboratory-size specimens (Altuhafi and Coop 2011;Bolton et al 2008;Cavarretta et al 2017;McDowell et al 1996;Nakata et al 1999;Zhao et al 2015). Discrete-element modeling (DEM) has been widely used to better understand the influence of particle fracture on the behavior of granular materials.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Evaluation of Sand Particle Fracture Using Discrete-Element Method and Synchrotron Microcomputed Tomography Images

Jarrar

Alshibli

Al-Raoush

2020

J. Geotech. Geoenviron. Eng.

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Recent research showed that fracture of sand particles plays a significant role in determining the plastic bulk volumetric changes of granular materials under different loading conditions. One of the major tools used to better understand the influence of particle fracture on the behavior of granular materials is discrete-element modeling (DEM). This paper employed the bonded block model (BBM) to simulate the fracture behavior of sand. Each sand particle is modeled as an agglomerate of rigid blocks bonded at their contacts using the linear-parallel contact model, which can transmit both moment and force. DEM simulated particles closely matched the actual three-dimensional (3D) shape of sand particles acquired using high-resolution 3D synchrotron microcomputed tomography (SMT). Results from unconfined one-dimensional (1D) compression of a single synthetic silica cube were used to calibrate the model parameters. Particle fracture was investigated for specimens composed of three sand particles that were loaded under confined 1D compression. Breakage energy measured from DEM models matched well with that measured experimentally. The paper studied the effects of contact loading condition and particle interaction on the fracture mode of particles using BBM that can closely capture the 3D shape of real sand particles.

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“…Moreover, as sand particles are curved, unlike flat-engineered surfaces, the processing procedure must flatten the surface or the contour of the particle, in order to remove the influence of curvature on the computed values of roughness. This may be achieved by some motif extraction method, filtering regular features (such as waviness) from textural features (Boulanger, 1992;Yang et al, 2017) or by discretisation of the surface using best-fit planes of small size (Cavarretta et al, 2016). In both cases, however, the results depend on the shape motif parameters or the size of the best-fit planes.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale morphological descriptors from the fractal analysis of particle contour

2019

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The increasing understanding of the connection between particle morphology and mechanical behaviour of granular materials has generated significant research on the quantitative characterisation of particle shape. This work proposes a simple and effective method, based on the fractal analysis of their contour, to characterise the morphology of soil particles over the range of experimentally accessible scales. In this paper, three new non-dimensional quantitative morphological descriptors are introduced to describe (i) overall particle shape at the macro-scale, (ii) particle regularity at the meso-scale, and (iii) particle texture at the micro-scale. The characteristic size separating structural features and textural features emerges directly from the results of the fractal analysis of the contour of the particle, and is a decreasing fraction of particle dimension. To explore the meaning of the descriptors, the method is applied first to a variety of Euclidean smooth and artificially roughened regular shapes and then to four natural and artificial sands with different levels of irregularity. Relationships are established between the new morphological descriptors and other quantities commonly adopted in the technical literature.

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The relevance of roundness to the crushing strength of granular materials

Cited by 53 publications

References 31 publications

Thermal Conductivity of Granular Soil Mixtures with Contrasting Particle Shapes

Thermal Conductivity of Granular Soil Mixtures with Contrasting Particle Shapes

Three-Dimensional Evaluation of Sand Particle Fracture Using Discrete-Element Method and Synchrotron Microcomputed Tomography Images

Multi-scale morphological descriptors from the fractal analysis of particle contour

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