Cyclic Shear Behavior of Unsaturated Volcanic Sandy Soil under Various Suction Conditions

Unno, Toshiyasu; Kazama, Motoki; Sento, Noriaki; Uzuoka, Ryosuke

doi:10.1061/40802(189)92

Cited by 12 publications

(17 citation statements)

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“…However, in this study, aˆne clean sand known as Toyoura sand was used as the testing material in order to explain the general liquefaction state of unsaturated soils. Other publications are available for reference purposes with regard to tests carried out on volcanic sandy soil (Kazama et al, 2006;Unno et al, 2006b). Figure 1 shows the grain size distributions of the Toyoura sand used in this study, which has noˆne content and a speciˆc gravity of 2.643.…”

Section: Physical Properties Of Soilmentioning

confidence: 99%

Liquefaction of Unsaturated Sand Considering the Pore Air Pressure and Volume Compressibility of the Soil Particle Skeleton

Unno

Kazama

Uzuoka

et al. 2008

Soils and Foundations

112

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Section: Physical Properties Of Soilmentioning

confidence: 99%

Liquefaction of Unsaturated Sand Considering the Pore Air Pressure and Volume Compressibility of the Soil Particle Skeleton

Unno

Kazama

Uzuoka

et al. 2008

Soils and Foundations

112

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“…The degree of saturation, which has a significant effect on the cyclic behavior of the unsaturated soil, has also been recognized. The cyclic shear strength of the unsaturated soil increases with the decreasing degree of saturation [1,[3][4][5][6][7][8]. Some results showed that the cyclic stress ratio almost doubled as the degree of saturation decreased from 100% to 90% [4,6].…”

Section: Introductionmentioning

confidence: 78%

“…In Japan, the Sanriku-Minami earthquake triggered a landslide in the town of Tsukidate on May 26, 2003. An artificial fill in this disaster area classified as a volcanic sandy soil lost its effective stress under cyclic loading although the degree of saturation is about 70% [1]. In 2011, the landfills along the northeastern shorelines of the Tokyo Bay liquefied because of the Tohoku earthquake, which caused soil subsidence around an area of 42 km 2 [2].…”

Section: Introductionmentioning

confidence: 99%

“…The pore air absorbs the generated excess pore pressures resulted in a reduction in the pore-air volume [6,7]. A reduction in the volume of unsaturated soils during fully undrained cyclic loading causes an increase in the degree of saturation [1,5]. Suction is a mechanism that affects the cyclic behavior of unsaturated soils [7].…”

Section: Introductionmentioning

confidence: 99%

“…Altun and Goktepe [4] conducted a torsional shear test on unsaturated silty clay to explore the small and large strain behavior of unsaturated soils. Unno et al [1,5] conducted a series of strain-controlled cyclic triaxial tests on the unsaturated sand under fully undrained conditions, namely, unexhausted air and undrained water, to study the general liquefaction state of unsaturated soils. Okamura et al [6,7] observed the influence of air and suction pressures on the liquefaction resistance of unsaturated soils through a series of cyclic triaxial tests on a fine clean sand and non-plastic silt under fully undrained conditions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fully undrained cyclic loading simulation on unsaturated soils using an elastoplastic model for unsaturated soils

Komolvilas

Kikumoto

2016

E3S Web Conf.

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Abstract. Several researchers have reported that Bishop's mean effective stress decreases in unsaturated soils under fully undrained cyclic loading conditions, and unsaturated soils are finally liquefied in a similar manner as saturated soils. This paper presents a series of simulations of such fully undrained cyclic loading on unsaturated soils using an elastoplastic model of the unsaturated soil. This model is formulated using the Bishop's effective stress tensor incorporating the following concepts: the volumetric movement of the state boundary surface containing the normal consolidation line and the critical state line due to the variation in the degree of saturation, a soil water characteristic curve model considering the effect of specific volume and hysteresis, the subloading surface model, and Boyle's law. Comparisons between the simulation results and the experimental ones show that the model agreed well with the unsaturated soil behavior under cyclic loading. Finally, the typical cyclic behavior of unsaturated soils under fully undrained conditions, such as the mechanism of liquefaction of unsaturated soils, the compression behavior, and an increase in the degree of saturation, are described through the proposed simulation results.

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Simulation of liquefaction of unsaturated soil using critical state soil model

Komolvilas

Kikumoto

2017

Num Anal Meth Geomechanics

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Summary Several researchers have reported that the mean effective stress of unsaturated soils having a relatively high degree of saturation gradually decreases under fully undrained cyclic loading conditions, and such soils can be finally liquefied like saturated soils. This paper describes a series of simulations of fully undrained cyclic loading on unsaturated soils, conducted using an elastoplastic model for unsaturated soils. This model is a critical state soil model formulated using effective stress tensor for unsaturated soils, which incorporates the following concepts: (a) the volumetric movement of the state boundary surface containing the critical state line owing to the variation in the degree of saturation; (b) the soil water characteristic curve considering the effects of specific volume and hydraulic hysteresis; and (c) the subloading surface concept for considering the effect of density. Void air is assumed to be an ideal gas obeying Boyle's law. The proposed model is validated through comparisons with past results. The simulation results show that the proposed model properly describes the fully undrained cyclic behavior of unsaturated soils, such as liquefaction, compression, and an increase in the degree of saturation. Finally, the effects of the degree of saturation, void ratio, and confining pressure on the cyclic strength of unsaturated soils are described by the simulation results. The liquefaction resistance of unsaturated soils increases as the degree of saturation and the void ratio decrease, and as the confining pressure increases. Furthermore, the degree of saturation has a greater effect on the liquefaction resistance than the confining pressure and void ratio. Copyright © 2017 John Wiley & Sons, Ltd.

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Cyclic Shear Behavior of Unsaturated Volcanic Sandy Soil under Various Suction Conditions

Cited by 12 publications

References 0 publications

Liquefaction of Unsaturated Sand Considering the Pore Air Pressure and Volume Compressibility of the Soil Particle Skeleton

Liquefaction of Unsaturated Sand Considering the Pore Air Pressure and Volume Compressibility of the Soil Particle Skeleton

Fully undrained cyclic loading simulation on unsaturated soils using an elastoplastic model for unsaturated soils

Simulation of liquefaction of unsaturated soil using critical state soil model

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