Evaluation of Properties of Rockfill Materials

Marschi, N. Dean; Chan, C. K.; Seed, H. Bolton

doi:10.1061/jsfeaq.0001735

Cited by 252 publications

(64 citation statements)

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“…stress where a mass is in equilibrium) (Singh 1976), and therefore will affect the angle of repose. Marachi et al (1972) have shown that decreases with increasing particle size, but they note that other studies suggest either no relationship or an opposite one. However, the actual physical factors that create the negative correlation between slope and particle size are unimportant.…”

Section: Introductionmentioning

confidence: 92%

Optimality, constraints, and hierarchies in the analysis of foraging strategies /

Lucas¹

1983

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This dissertation is the end result of the input and help from many X people.Dr. James Dufty derived the models I used in the first chapter, and Dr. Karl Taylor verified the math. Linda Griffin helped a great deal with Chapter III, and weighed lots of fruit flies and fed lots of antlions. Steven Frank, Alan Grafen, and Dr. Eric Charnov were excellent sounding boards for some of my ideas on the theory of foraging behavior; Steve and Alan were also instrumental in teaching me all I know about statistical models. Dr. Franl: Mature provided a fellowship that gave me time to finish the work on Chapter I and also provided easy access to Sea Horse Key. Dr. Mike LaBarbera was a god-send in showing me what biomechanics is, and also in explaining the ins and outs of Stoke 's Law. Thanks to my committee, Drs.

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Section: Introductionmentioning

confidence: 92%

Optimality, constraints, and hierarchies in the analysis of foraging strategies /

Lucas¹

1983

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“…The construction of large facilities then accompanied the scientific objective to extrapolate the behavior of natural rockfills used in dam construction from triaxial tests on finer fractions of the same material. Those experimental programs clearly highlighted the effect of grain crushing on the value of the shear resistance and more particularly on the peak friction angle (Marsal 1967;Marachi et al 1969;Leps 1970;Marachi et al 1972;Becker et al 1972). Extensive triaxial testing programs were completed with either one dimensional compression tests (Marsal 1967) or plane strain compression tests (Marsal et al 1967;Becker et al 1972) on the same rockfill granular materials, and all of the test results led to the conclusion that (1) grain breakage is enhanced when stress level, grain size, and sample dimension are increased; and (2) the peak friction angle value decreases if the amount of grain crushing increases, accompanying a more compressible behavior.…”

Section: Introductionmentioning

confidence: 99%

“…The pioneering work on the behavior of coarse soils was done at the University of California, Berkeley (Marachi et al 1969;Marachi et al 1972;Becker et al 1972) and at the University of Mexico (Marsal et al 1965;Marsal 1967;Marsal et al 1967) in the 1960s and 1970s. The construction of large facilities then accompanied the scientific objective to extrapolate the behavior of natural rockfills used in dam construction from triaxial tests on finer fractions of the same material.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sample Size on the Behavior of Granular Materials

Hu¹,

Dano²,

Hicher³

et al. 2011

Geotechnical Testing Journal

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International audienceNatural soils or coarse granular materials containing large particles such as rockfill or ballast are often an issue for geotechnical projects. However, since it is usually complicated or impossible to set up a big enough experimental apparatus to test these materials, their mechanical behavior remains poorly known.To circumvent this difficulty, we have developed a set of triaxial cells of various sizes to study the experimental behavior of granular soils containing particle sizes of up to 160 mm. This paper presents the first results of a two-part experimental study. The first part consists of triaxial tests on sand samples of different sizes in order to examine specimen scale effects. Pre-peak behavior is not affected by the specimen size, whereas post-peak behavior depends on the test conditions that control the development of strain localizations. In the second part, we present drained triaxial compression tests on large samples of calcareous rockfill materials that have parallel grain size distributions.The results show a nonstandard evolution of the friction angle in relationship to grain size if compared to similar studies on coarse granular materials. Although grain crushing occurs during compression, the strain-stress curves of the different materials with different grain sizes do remain close. We explain this phenomenon by the strength evolution of the individual grains with respect to their size

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“…But, many contradictory observations have been reported over the last decades. [3,[5][6][7][8] show that the ⇤ e-mail: slinero@srk.com.au ⇤⇤ e-mail: emilien.azema@umontpellier.fr ⇤⇤⇤ e-mail: n.estrada22@uniandes.edu.co ⇤⇤⇤⇤ e-mail: Stephen.Fityus@newcastle.edu.au † e-mail: john.simmons@newcastle.edu.au ‡ e-mail: alizcano@srk.com shear strength may increase or decline depending on the scaled material. In contrast, recent 2D/3D discrete numerical simulations of sheared assemblies composed of unbreakable and identically-shaped particles suggest that PSD modification should not significantly a↵ect the shear strength of the material [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Impact of sample scaling on shear strength: coupled effects of grains size and shape

Linero-Molina¹,

Azéma

Estrada

et al. 2021

EPJ Web Conf.

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Size limitations of geotechnical testing equipment often require that samples of coarse granular materials have to be scaled in order to be tested in the laboratory. Scaling implies a convenient modification of the particle size distribution (PSD) to reduce particle sizes. However, it is well known that particle size and shape may be correlated in nature, due to geological factors (as an example). By means of two-dimensional contact dynamics simulations, we analyzed the effect of altering the size span on the shear strength of granular materials when particle size and shape are correlated. Two different systems were considered: one made of only circular particles, and the second made of size-shape correlated particles. By varying systematically the size span we observed that the resulting alteration of material strength is not due to the change in particle sizes. It results instead from the variation of the particle shapes induced by the modification of the PSD, when particle size and particle shape are correlated. This finding suggests that particle shape distribution is a higher order factor than PSD for the shear strength of granular materials. It also highlights the importance of particle shape quantification in soil classification and the case for its consideration in activities such as sampling, subsampling, and scaling of coarse materials for geotechnical testing

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Evaluation of Properties of Rockfill Materials

Cited by 252 publications

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Optimality, constraints, and hierarchies in the analysis of foraging strategies /

Optimality, constraints, and hierarchies in the analysis of foraging strategies /

Effect of Sample Size on the Behavior of Granular Materials

Impact of sample scaling on shear strength: coupled effects of grains size and shape

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