Influence of particle shape on small-strain damping ratio of dry sands

Payan, Meghdad; Senetakis, Kostas; Khoshghalb, Arman; Khalili, Nasser

doi:10.1680/jgeot.15.t.035

Cited by 51 publications

(16 citation statements)

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“…Giang et al (2017) obtained the sphericity of a calcareous sand and Mol sand by X-ray tomography and they found the sphericity of the calcareous sand is lower than that of the Mol sand. Research conducted by Payan et al (2016) and Giang et al (2017) reveal that sands with lower sphericity are stiffer due to the stronger intercontact and rotation resistance between particles. In addition, a lot of research has been carried out on the effect of mean grain size (D 50 ) and the coefficient of uniformity (C u ) on the smallstrain stiffness of sands and it has been demonstrated that C u is an important factor affecting the small-strain stiffness, while the effect of D 50 is insignificant (Iwasaki & Tatsuoka, 1977;Wichtmann & Triantafyllidis, 2009, 2010Enomoto, 2016;Payan et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Research conducted by Payan et al (2016) and Giang et al (2017) reveal that sands with lower sphericity are stiffer due to the stronger intercontact and rotation resistance between particles. In addition, a lot of research has been carried out on the effect of mean grain size (D 50 ) and the coefficient of uniformity (C u ) on the smallstrain stiffness of sands and it has been demonstrated that C u is an important factor affecting the small-strain stiffness, while the effect of D 50 is insignificant (Iwasaki & Tatsuoka, 1977;Wichtmann & Triantafyllidis, 2009, 2010Enomoto, 2016;Payan et al, 2016). The research presented above indicates that the investigation of the small-strain stiffness anisotropy of sandy soils, taking the particle characteristics and gradation into consideration, is interesting and worthwhile, especially for calcareous sand with a morphology of low sphericity, as reported by Giang et al (2017).…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic small-strain stiffness of calcareous sand affected by sample preparation, particle characteristic and gradation

2021

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Sands exhibit a directional diversity in shear modulus at small strains, reflecting the anisotropic stiffness behaviour in the structure. In this paper, sample preparation method, particle shape and particle size are considered as parameters to produce samples with various initial fabric. Five preparation methods, namely, air and water pluviation, dry and moist tamping and dry funnel deposition are used to reconstitute the samples. The stiffness anisotropy of calcareous sand and Mol silica sand is quantified by the small-strain modulus G 0 measured in horizontal and vertical planes with the bender element technique in triaxial tests. Test results show that calcareous sands behave as an elastic homogeneous continuum material at small strains. Calcareous samples prepared by the air pluviation method possess the highest anisotropic ratios. The lowest stiffness anisotropy exists in the samples prepared by moist tamping and dry funnel deposition methods. Compared with the anisotropic ratios of the air pluviation samples from the literature, the notably higher values for the calcareous sand in this study are attributed to the lower sphericity. In addition, less prominent stiffness anisotropy is found in calcareous sands with smaller particle sizes (D 50 ).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anisotropic small-strain stiffness of calcareous sand affected by sample preparation, particle characteristic and gradation

2021

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“…In addition, Payan et al . [ 34 ] studied the effect of particle shape on the damping ratio of soils due to free vibration and developed an expression for the damping ratio of soils subjected to confining stress.…”

Section: Introductionmentioning

confidence: 99%

Assessment of dynamic material properties of intact rocks using seismic wave attenuation: an experimental study

et al. 2017

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The mechanical properties of any substance are essential facts to understand its behaviour and make the maximum use of the particular substance. Rocks are indeed an important substance, as they are of significant use in the energy industry, specifically for fossil fuels and geothermal energy. Attenuation of seismic waves is a non-destructive technique to investigate mechanical properties of reservoir rocks under different conditions. The attenuation characteristics of five different rock types, siltstone, shale, Australian sandstone, Indian sandstone and granite, were investigated in the laboratory using ultrasonic and acoustic emission instruments in a frequency range of 0.1–1 MHz. The pulse transmission technique and spectral ratios were used to calculate the attenuation coefficient (α) and quality factor (Q) values for the five selected rock types for both primary (P) and secondary (S) waves, relative to the reference steel sample. For all the rock types, the attenuation coefficient was linearly proportional to the frequency of both the P and S waves. Interestingly, the attenuation coefficient of granite is more than 22% higher than that of siltstone, sandstone and shale for both P and S waves. The P and S wave velocities were calculated based on their recorded travel time, and these velocities were then used to calculate the dynamic mechanical properties including elastic modulus (E), bulk modulus (K), shear modulus (µ) and Poisson's ratio (ν). The P and S wave velocities for the selected rock types varied in the ranges of 2.43–4.61 km s−1 and 1.43–2.41 km h−1, respectively. Furthermore, it was observed that the P wave velocity was always greater than the S wave velocity, and this confirmed the first arrival of P waves to the sensor. According to the experimental results, the dynamic E value is generally higher than the static E value obtained by unconfined compressive strength tests.

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“…However, a complete characterization of the constitutive behavior of geological materials necessitates their examination at multi-scales, including the interactions between grains (i.e., micromechanical response) and the influence of these interactions on the bulk behavior of “granular” systems. For example, previous studies on granular materials have shown a strong dependency of their mechanical response as bulk systems, on the interparticle friction [ 29 , 30 , 31 , 32 , 33 ] and the properties/characteristics of individual grains such as roughness, shape and strength/mode of failure, which influence the energy dissipation mechanisms and the resistance against shearing-induced strains [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. Multi-scale insights of granular systems can provide a framework to understand the load transfer mechanisms and the flow behavior of particulate materials at a fundamental level [ 36 , 37 , 38 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ], which are strongly linked to the properties at the grain-scale.…”

Section: Introductionmentioning

confidence: 99%

A Grain-Scale Study of Mojave Mars Simulant (MMS-1)

Kasyap

Senetakis

2021

Sensors

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Space exploration has attracted significant interest by government agencies and the scientific community in recent years in an attempt to explore possible scenarios of settling of facilities on the Moon and Mars surface. One of the important components in space exploration is related with the understanding of the geophysical and geotechnical characteristics of the surfaces of planets and their natural satellites and because of the limitation of available extra-terrestrial samples, many times researchers develop simulants, which mimic the properties and characteristics of the original materials. In the present study, characterization at the grain-scale was performed on the Mojave Mars Simulant (MMS-1) with emphasis on the frictional behavior of small size samples which follow the particle-to-particle configuration. Additional characterization was performed by means of surface composition and morphology analysis and the crushing behavior of individual grains. The results from the study present for the first time the micromechanical tribological response of Mars simulant, and attempts were also made to compare the behavior of this simulant with previously published results on other types of Earth and extra-terrestrial materials. Despite some similarities between Mars and Moon simulants, the unique characteristics of the MMS-1 samples resulted in significant differences and particularly in severe damage of the grain surfaces, which was also linked to the dilation behavior at the grain-scale.

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Influence of particle shape on small-strain damping ratio of dry sands

Cited by 51 publications

References 10 publications

Anisotropic small-strain stiffness of calcareous sand affected by sample preparation, particle characteristic and gradation

Anisotropic small-strain stiffness of calcareous sand affected by sample preparation, particle characteristic and gradation

Assessment of dynamic material properties of intact rocks using seismic wave attenuation: an experimental study

A Grain-Scale Study of Mojave Mars Simulant (MMS-1)

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