Correlating Particle Shape Parameters to Bulk Properties and Load Stress at Two Water Contents

Miller, Nathaniel A.; Henderson, Jason J.

doi:10.2134/ats-2013-0005bc

Cited by 3 publications

(3 citation statements)

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“…From the Scanning Electron Microscope (SEM) image in Figure 3 and thin section image (Figure 4), silt and sand particles shape are observed and compared to the designated chart [9] in order to determine the roundness and sphericity of a soil particle. It can be observed that the particle is basically sub-angular and has a medium sphericity.…”

Section: Morphological and Mineralogical Propertiesmentioning

confidence: 99%

The Effect of Soil Particle Arrangement on Shear Strength Behavior of Silty Sand

Daud

Hui

Juliana

2016

MATEC Web of Conferences

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Abstract. The presence of fines in sandy soil is recognized as a problem in geotechnical engineering. It is often assumed that the strength and liquefaction potential of a soil decreases with increasing fines content. Sand with a significant amount of fines is always encountered in geotechnical engineering projects. The main interest of this paper is to study the effect of particles arrangement and stress behaviour on sand and silty sand sample. The objectives are to determine the basic properties as well as the morphological and mineralogical properties and the relationship of those properties to the stress behaviour of the soils. Sand-silt mixtures with fines contents of 20% and 40% were prepared and a series of testing was carried out to determine their basic properties, morphological and thin section properties, and mechanical properties by using direct shear box equipment. Results show that the basic properties and morphological properties of soil affect the mechanical behaviour of soil. Shape of the soil particle can influence the packing of the soil, hence altering the mechanical behaviour of the soil. From the thin section, the soil is observed to be well graded and have a dense packing while the minerals observed were mainly quartz and rutile.

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Section: Morphological and Mineralogical Propertiesmentioning

confidence: 99%

The Effect of Soil Particle Arrangement on Shear Strength Behavior of Silty Sand

Daud

Hui

Juliana

2016

MATEC Web of Conferences

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“…Since particle rotation is a basic component of deformation, as the angularity increases, the ratio of rolling to sliding contacts decreases, which leads to greater shearing resistance. Dense packing enhances the effect of angularity because as the total number of contacts between particles increases, the rotation resistance increases simultaneously [ 55 , 56 ]. While investigations of the influence of particle size have mainly been focused on binary mixtures of clay–sand, sand–gravel or clay–gravel, and investigations of the influence of particle shape have mainly been conducted on sands, the experiments illustrating the effects of particle shape and size distribution on the shear behavior of soils characterized by a wide range of particle sizes are rare [ 57 ].…”

Section: Introductionmentioning

confidence: 99%

Structure and Strength of Artificial Soils Containing Monomineral Clay Fractions

et al. 2021

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Structure and strength are responsible for soil physical properties. This paper determines in a uniaxial compression test the strength of artificial soils containing different proportions of various clay-size minerals (cementing agents) and silt-size feldspar/quartz (skeletal particles). A novel empirical model relating the maximum stress and the Young’s modulus to the mineral content basing on the Langmuir-type curve was proposed. By using mercury intrusion porosimetry (MIP), bulk density (BD), and scanning electron microscopy (SEM), structural parameters influencing the strength of the soils were estimated and related to mechanical parameters. Size and shape of particles are considered as primary factors responsible for soil strength. In our experiments, the soil strength depended primarily on the location of fine particles in respect to silt grains and then, on a mineral particle size. The surface fractal dimension of mineral particles played a role of a shape parameter governing soil strength. Soils containing minerals of higher surface fractal dimensions (rougher surfaces) were more mechanically resistant. The two latter findings appear to be recognized herein for the first time.

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“…Turfgrass established over an internally drained, high‐sand growing media (rootzone) is common in many modern sporting facilities. High‐sand rootzones are chosen for their ability to maintain balanced air‐filled and capillary porosity, despite compactive forces from athletes and maintenance equipment (Miller and Henderson, 2011).…”

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confidence: 99%

Divot Resistance of Thick Cut Sod as Influenced by Preharvest Nitrogen and Sand Topdressing

Mascitti

McNitt

Serensits

2017

Intl Turfgrass Soc Res J

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Professional sports facilities in the United States install thick‐cut sod during the playing season. Field performance immediately after installation is primarily determined by maintenance practices at the sod farm. This research investigated the influence of six N programs (98–245 kg N ha−1 yr−1 applied in spring or fall) and two sand‐topdressing rates (0 and 8.5 kg m−2 yr−1) on Kentucky bluegrass (KBG, Poa pratensis L.). In 2013 and 2014, KBG was established from seed in September and grown for 7 mo at a commercial sod farm (Hammonton, NJ) and then transported as sod and grown for another 7 mo under six by two treatment combinations at University Park, PA. Sod was harvested 14 mo after seeding and evaluated for divot resistance, shear, and sod strength. In 2013, all N treatments were similar in divot resistance except the 245‐kg total N rate, which exhibited the lowest divot resistance. In 2014, the most divot resistance was observed with 49 kg N ha−1 applied three times in the spring (147 kg total N) or using the same N program with another 49 kg ha−1 applied in September (196 kg total N). Nitrogen treatments resulted in few meaningful differences in shear resistance. Sand topdressing affected divot and shear resistance differently. Topdressing reduced divot resistance by only 6% in 2014 and had no effect in 2013. Topdressing reduced shear resistance by averages of 21.6 and 28.4% in 2013 and 2014, respectively. Growers may improve the divot resistance of KBG sod by moderating N inputs.

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Correlating Particle Shape Parameters to Bulk Properties and Load Stress at Two Water Contents

Cited by 3 publications

References 0 publications

The Effect of Soil Particle Arrangement on Shear Strength Behavior of Silty Sand

The Effect of Soil Particle Arrangement on Shear Strength Behavior of Silty Sand

Structure and Strength of Artificial Soils Containing Monomineral Clay Fractions

Divot Resistance of Thick Cut Sod as Influenced by Preharvest Nitrogen and Sand Topdressing

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