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In research concerning the crushing mechanism of granular materials, natural materials-such as sand [27, 30, 36,38], soil particles [29], basalt [32], and ice particles [36]-are mostly taken as ...
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Engrg. 122: 4 (1996) 309-316 Lade, P. V., Yamamuro, J. A. and Bopp, P. A. (1996): Significance of particle crushing in granular materials, J. Geotech. Engrg., 122(4), 309-316. 14) R.A. Lang, Numerical simulation of comminution in granular materials with an application to fault gouge evolution unpublished Master of Science Thesis (2002) A&M ...
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The prediction of the crushing strength of sands is still an unresolved problem in soil mechanics. For natural sand grains with a regular geometry, Weibull theory has long been adopted to explain the decay of a nominal crushing strength with increasing particle size. The Weibull parameters for a given soil relate strength to size, and, …
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1. Introduction. Granular materials such as sand, soil, and rock aggregates are ubiquitous. Particle size distribution of granular materials has great influence on their physico-mechanical properties, such as compressibility, yield strength and permeability [1].Gradation evolution of granular materials is important to earth and planetary …
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Sands exhibit patterns of time effects different from those observed in clays. It appears that time effects in sand are associated with crushing of particles, and a mechanistic picture of time effects in granular materials is constructed in which time effects depend on particle crushing by static fatigue, interparticle friction, and grain rearrangement.
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Previous studies related with the crushing of granular materials have been critically reviewed and evaluated in Sect. 2. Experimental procedure and material preparation have been summarized in Sects. 3, 4 and 5. The results of the experiments are evaluated and explained in Sect. 6. Major findings of the paper are summarized in Sect. 7 and the ...
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We investigate confined comminution of a representative granular material, quartz sand, under quasi-static and dynamic compression at different stress levels, with …
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The effect of particle rolling and crushing on the evolutions of the two types of anisotropy, i.e., anisotropy of particle packing (microstructure) and anisotropy of force chains, is investigated numerically using the discrete element method. To this end, the classical fabric tensor is adopted to describe the anisotropy of microstructure, while two …
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Quasi-static and dynamic compression experiments are conducted on quartz sand, to study the stress-induced gradation evolution of granular materials under confined comminution. The particle size distributions obtained from laser diffractometry show three regimes, and the second regime is found to satisfy a power law or fractal distribution. …
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ZHANG Ke-fen, ZHANG Sheng, TENG Ji-dong, SHENG Dai-chao. Influences of self-organization of granular materials on particle crushing based on discrete element method[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(4): 743-751. DOI: 10.11779/CJGE201804019
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This paper aims to show the mechanical properties of crushable granular materials from a mesoscopic perspective. Based on the principles of irregularly shaped …
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The aim of this study is to investigate the effect of crushing on the bulk behavior of granular materials by using manufactured granular materials (MGM) rather than using a naturally occurring ...
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The behavior of granular materials mainly depends on the mechanical and engineering properties of particles in its structural matrix. Crushing or breakage of granular materials under compression or shear occurs when the energy available is sufficient to overcome the resistance of the material. Relatively little systematic research …
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Granular crushing significantly changes mechanical behaviours, especially under elevated stress levels. Therefore, this study aims to develop a model to simulate the constitutive behaviours of granular materials at the crushing-dominant stage.
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of Crushing in Granular Materials: A Probability-Based Predictive Method," Journal of the Mechanics and Phys- ics of Solids, Vol. 55, No. 10, 2007, pp. 2142-2156.
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Microscopic properties of granular materials typically exhibit significant heterogeneity. Realistic particle crushing simulation in granular materials requires the use of model that incorporate the spatial heterogeneity of its microscopic properties. This study introduces a novel approach, the Random Field Theory-Discrete Element Method (RFT …
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The crushing of a constrained granular material is a complex process of subsequent particle size and arrangement changes. One cannot decide on the fly …
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Granular materials are commonly utilized in geotechnical engineering, including rock-fill dam, railway, mining and so on [1,2,3,4,5,6,7,8,9].The mechanical properties of granular material, such as deformation, strength and grain crushing, are very complicated and random due to its complex internal structure (mineral composition, flaw …
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Determination of crushing strength of granular material is very important for assessing its suitability in various engineering and industrial applications. Laboratory investigations that would yield stress–strain behaviour, and hence, crushing strength of the granular material are extremely cumbersome and time consuming. Also, results …
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Particle breakage occurs when the stresses imposed on soil particles exceed their strength. To quantify the amount of breakage, many particle breakage factors have been proposed. Correlations of particle breakage parameters with standard soil parameters such as effective mean normal stress at failure and void ratio at failure do not provide a …
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Zhu and Zhao investigated the particle shape evolution and its interplay with the crushing characteristics during continuous crushing of the granular sand by …
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Granular materials forming part of natural slopes, embankments, subgrades of foundations, and pavement structures are subjected to both static and dynamic loads during their engineering lives. ... In this way, by using a simplified failure criterion, DEM can be used to visualize and understand the evolution of granular crushing. This is ...
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In this study, one-dimensional (1D) compression on crushable granular materials is simulated using two-dimensional (2D) DEM to identify the specific role of …
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Nevertheless, crushing granular materials is a complex process influenced by many factors. For example, the distribution of unbreakable particles in the volume of the sample is crucial. Steel balls need to touch good candidates for breaking (particles of similar size) to maintain the mechanism leading to fractal distribution.
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It is widely acknowledged that undergoing substantial grain crushing, the PSDs of granular materials becomes self-similar, also known as fractal. Herein based on the experimental results on the DGPs, the evolution of particle crushing can also be extended to the fractional particles in non-uniform samples.
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Grain crushing is also of great interest to geophysical research since it is a key mechanism in geoscience with relevance to cataclastic flow, localized deformation in porous rocks, and accretionary wedges. The process of grain crushing in granular media is featured by accompanied evolutions of both grain size and shape.
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The mechanical behaviour of granular materials depends on their grading. Crushing of particles under compression or shear modifies the grain size distribution, with a tendency for the percentage of…
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Granular materials forming part of natural slopes, embankments, subgrades of foundations, and pavement structures are subjected to both static and dynamic loads during their engineering lives. As a result of these loads, particle crushing may occur. The present study demonstrates that the discrete-element method (DEM) can be used to …
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The crushing of particles in a granular material must be related to changes in the 2079 2080 G. R. MCDOWELL et a!. particle size distribution (Hardin, 1985). There …
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The capacity of driven piles in breakable weak sands is less than that of similar piles in strong sands. Numerical simulations using the PFC2D program, based on discrete element method (DEM), were used to investigate the penetration resistance of driven piles. The penetration resistance for an unbreakable granular material and a …
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