Shear Moduli of Sands under Cyclic Torsional Shear Loading

Iwasaki, Toshio; Tatsuoka, Fumio; Takagi, Yoshikazu

doi:10.3208/sandf1972.18.39

Cited by 366 publications

(150 citation statements)

References 6 publications

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“…For the deˆnition of the void ratio function, various approaches have been proposed, namely those by Hardin and Richart (1963) and Iwasaki et al (1978), by Hardin (1978) and Chung et al (1984), and by Jamiolkowski et al (1991) and Lo Presti (1995). These can be directly applied when no speciˆc study is carried out to determine which is most suitable for the soil in study, or serve as a starting point for a more speciˆc analysis.…”

Section: Assessment Of Sampling Quality By Comparison Of Seismic Wavementioning

confidence: 99%

Shear wave Velocities for Sample Quality Assessment on a Residual Soil

Ferreira

Fonseca

Nash

2011

Soils and Foundations

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For the assessment of the quality of laboratory samples, a number of methods are available, though not universally applicable to any soils. This paper examines the issue of sampling quality and its assessment using comparisons between shear wave velocity measurements in situ and in recovered samples as the base, which is very useful in naturally structured granular soils, like residual soils. For this purpose, cross-hole and down-hole tests were performed in thê eld and bender elements measurements were made on triaxial samples collected from two experimental sites on residual soil from Porto granite. Various sampling techniques and tools were used, including block sampling and diŠerent tube samplers. The analysis of the results has led to a new classiˆcation of sampling quality and sample condition based on the comparison of normalised shear wave velocities in theˆeld and in the laboratory.

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Section: Assessment Of Sampling Quality By Comparison Of Seismic Wavementioning

confidence: 99%

Shear wave Velocities for Sample Quality Assessment on a Residual Soil

Ferreira

Fonseca

Nash

2011

Soils and Foundations

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“…where pr is a reference pressure (＝1.0 kPa) and F(e) is a function to remove scattering of void ratio, e, among test specimens (Hardin and Richart, 1963;Iwasaki et al, 1978), and given as:…”

Section: Elastic Modulusmentioning

confidence: 99%

Yielding Characteristic and Non-Coaxiality of Toyoura Sand on p′-Constant Shear Stress Plane

Ohkawa

Kuwano

Nakada

et al. 2011

Soils and Foundations

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“…Certain additional modifications (the equations marked with an asterisk in Table 1) were made to this model in order to improve the simulation of experimental data, and capture aspects of sand behaviour that are important in the analysis of foundations (Loukidis, 2006;Loukidis & Salgado, 2009a). The model parameters were determined for two sands: air-pluviated/dry-deposited Toyoura sand (Iwasaki et al, 1978;Fukushima & Tatsuoka, 1984;Lam & Tatsuoka, 1988;Yoshimine et al, 1998) and water-pluviated/slurry-deposited clean Ottawa sand (Carraro et al, 2003;Carraro, 2004;Murthy, 2006;Murthy et al, 2007). Toyoura sand has mean particle size D 50 % 0 .…”

Section: Constitutive Modelmentioning

confidence: 99%

Effect of relative density and stress level on the bearing capacity of footings on sand

Loukidis¹,

Salgado²

2011

Géotechnique

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The design of shallow foundations relies on bearing capacity values calculated using empirical procedures that are based in part on solutions obtained using the method of characteristics, which assumes a soil that is perfectly plastic following an associated flow rule. In this paper the problem of strip and circular footings resting on the surface of a sand layer is analysed using the finite-element method. Analyses are performed using a two-surface plasticity constitutive model that realistically captures the aspects of the mechanical response of sands that are relevant to the bearing capacity problem. In particular, the model accounts for non-associated flow, strain-softening, and both stress-induced and inherent anisotropy. Based on the results of the analyses, the paper examines the validity of the bearing capacity factors N ª and shape factors s ª used in practice. A relationship for determining appropriate values of friction angle for use in bearing capacity calculations is also proposed.KEYWORDS: anisotropy; bearing capacity; footings/foundations; numerical modelling; plasticity; sands L'étude de fondations peu profondes repose sur des valeurs de force portante calculées en utilisant des procé-dures empiriques, basées en partie sur des solutions obtenues avec la méthode des caractéristiques, qui pré-suppose la présence d'un sol parfaitement plastique en suivant une règle d'écoulement connexe. Dans la présente communication, on a analysé le problème de semelles filantes et circulaires posées sur la surface d'une couche de sable, avec la méthode aux éléments finis. Des analyses ont été effectuées en utilisant un modèle constitutif de plasticité de deux surfaces, exprimant, de façon réaliste, les aspects de la réaction mécanique des sables dans le contexte du problème de la force portante. Ce modèle se penche notamment sur le débit non associé, sur le radoucissement, ainsi que sur l'anisotropie par pression et inhérente. Sur la base des résultats des analyses, la communication examine la validité des facteurs de force portante N ª et des facteurs de forme s ª utilisés dans la pratique. En outre, on propose également un rapport pour la détermination de valeurs appropriées de l'angle de frottement pour les calculs de la force portante.

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Shear Moduli of Sands under Cyclic Torsional Shear Loading

Cited by 366 publications

References 6 publications

Shear wave Velocities for Sample Quality Assessment on a Residual Soil

Shear wave Velocities for Sample Quality Assessment on a Residual Soil

Yielding Characteristic and Non-Coaxiality of Toyoura Sand on p′-Constant Shear Stress Plane

Effect of relative density and stress level on the bearing capacity of footings on sand

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