Simple Shear Testing on Sand in a Torsional Shear Apparatus

Pradhan, Tej B.S.; Tatsuoka, Fumio; Horii, Noriyuki

doi:10.3208/sandf1972.28.2_95

Cited by 77 publications

(24 citation statements)

References 17 publications

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“…Theˆrst assumption is that, except for the initial small strain level, the principal axes of stress and irreversible strain increment are co-axial (Davis, 1968). This assumption was validated by simple shear tests on rectangular prismatic specimens of sand using the Cambridge Simple Shear Apparatus in the late 60's (Cole, 1967;Stroud, 1971) and later by torsional simple shear tests on hollow cylindrical specimens of sand using a torsional shear apparatus (Pradhan et al, 1988a, b). It is assumed hereafter that the deformation in the shear zone in the DS specimen is under the simple shear condition and the strain increments are nearly the same as the irreversible strain increments.…”

Section: Comparison Among Viscous Properties In Ds Tc and Pscmentioning

confidence: 97%

Viscous Behaviour of Unbound Granular Materials in Direct Shear

Duttine

Tatsuoka²,

Kongkitkul

et al. 2008

Soils and Foundations

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Section: Comparison Among Viscous Properties In Ds Tc and Pscmentioning

confidence: 97%

Viscous Behaviour of Unbound Granular Materials in Direct Shear

Duttine

Tatsuoka²,

Kongkitkul

et al. 2008

Soils and Foundations

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“…1 respect to torque loading system were made by Ampadu and Tatsuoka (1993a) from the one used by Tatsuoka et al (1986b) and Pradhan et al (1988), and a minor modification with adding an electro-magnetic brake for the loading system was made by the authors.…”

Section: Apparatusmentioning

confidence: 99%

“…With the decrease in the initial effective horizontal stress, as can be seen from the figure, the value ofmp is decreased although the rate of its change is increased. c) Based on the above estimations, the system compliance ratio CR due to MP was evaluated as: (10) whereKs is the bulk modulus of the tested soil, andKc,mp is the apparent bulk modulus due to MP. Subsequently, Table 2 summarizes the result of the above correction in terms of the values of CR and CN for respective confining stress levels.…”

Section: Liquefaction Resistance Curves and Their Correction For Effementioning

confidence: 99%

Liquefaction Properties of Toyoura Sand in Cyclic Tortional Shear Tests Under Low Confining Stress

Koseki

Yoshida

Sato

2005

SOILS AND FOUNDATIONS

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A series of undrained cyclic torsional shear tests was conducted to investigate liquefaction properties of Toyoura sand under low confining stress. Hollow-cylindrical specimens were prepared by air pluviation at a relative density of about 55%. After being saturated, they were anisotropically consolidated to an effective vertical stress of 9.8, 29.4 and 98.1 kPa, while keeping the effective horizontal stress to be half of the vertical one. They were subjected to undrained cyclic torsional shear without allowing any vertical displacement of the top cap. The amplitude of the cyclic shear stress was kept constant with correction for the effects of membrane force on the measured values. The liquefaction resistance was found to increase with the decrease in the confining stress, while correction for the effects of membrane penetration did not significantly affect this tendency. Analyses of the test results revealed that the liquefaction properties were affected by the mobilization of shear resistance under extremely low effective stress states and the stress level-dependency of shear modulus that was normalized by the confining stress. Finally, by introducing a concept of apparent increase in the effective mean principal stress, a simplified procedure to estimate the liquefaction resistance under low confining stresses was proposed.

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“…Some of these factors can be assessed by state of the art laboratory investigations e.g. Torsional Simple Shear (TOSS), [5], Resonant Column [6], [7], or Bender Element [8] testing. Results of such investigations are used to improve existing material models or create new models, which represent more aspects of the real behavior than earlier ones.…”

Section: Small Strain Stiffness Of Soilsmentioning

confidence: 99%

Verification of the Ramberg-Osgood Material Model in Midas GTS NX with the Modeling of Torsional Simple Shear Tests

Szilvágyi

Ray

2018

Period. Polytech. Civil Eng.

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This study focuses on the back analysis of a geotechnical laboratory test with nonlinear finite element modeling using the IntroductionRecently the importance of numerical modeling in geotechnical engineering has increased greatly; not only in research, but in everyday practice as well. As a result, geotechnical material models have developed tremendously due to their increased use with ever more complex design projects. While advances in computer technology have made this possible; the many economic and practical advantages of faster and more accurate solutions have made it a reality. The cycle time between research, development, deployment, and design implementation has indeed been reduced from years to months.Since the deployment cycle has shortened, the process of verification and validation are even more crucial [1]. For geotechnical finite element software, verification is the process of showing that a model or method has been properly implemented in a computer program; while validation makes plausible that a computer model possesses the essential features to analyze a real world problem with results that are representative for the situation. The former is usually done by the software developer and the latter should be done by the user when creating a model. This paper focuses on the verification of the Ramberg-Osgood model in an axisymmetric case for static torsional loading. Laboratory tests have been performed on dry sand samples and results are used to verify the capabilities of the material model.

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Simple Shear Testing on Sand in a Torsional Shear Apparatus

Cited by 77 publications

References 17 publications

Viscous Behaviour of Unbound Granular Materials in Direct Shear

Viscous Behaviour of Unbound Granular Materials in Direct Shear

Liquefaction Properties of Toyoura Sand in Cyclic Tortional Shear Tests Under Low Confining Stress

Verification of the Ramberg-Osgood Material Model in Midas GTS NX with the Modeling of Torsional Simple Shear Tests

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