Cyclic Stress-Strain Behavior of Partially Saturated Soils

Altun, Selim; Göktepe, A. Burak

doi:10.1061/40802(189)37

Cited by 15 publications

(12 citation statements)

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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: 79%

“…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]. However, the effect of the degree of saturation on cyclic shear strength will reduce if a low confining pressure is exerted on the unsaturated soil [6].…”

Section: Introductionmentioning

confidence: 97%

“…Ishihara et al [3] studied the effects of relative density and the degree of saturation on the undrained behavior of near-saturated sand through multiple series of monotonic and cyclic triaxial tests. 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.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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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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“…Prediction of the mechanical cyclic behaviours of these unsaturated soils is essential for design of new civil systems and health assessment of existing ones. (Zeghal & Medina, 2006) Some investigations have recently been carried out to explore the mechanical cyclic behaviours of unsaturated soils (Altun & Gëktepe, 2006;Liu & Xiao, 2010;Sherif, Tsuchiya, & Ishibashi, 1977;Unno, Kazama, Uzuoka, & Sento, 2008;Usaborisut, Koike, Bahalayodhin, Niyamapa, & Yoda, 2001;Wang, Yang, Kong, & Luan, 2008;Xia & Hu, 1991). The investigations demonstrated that the mechanical cyclic behaviours depend strongly on the degree of saturation, higher degree of saturation corresponding to lower cyclic shear strength.…”

Section: Introductionmentioning

confidence: 96%

Influence of drying/wetting cycles on the mechanical cyclic behaviours of silty clay

Liu

Tang

Yang

et al. 2014

European Journal of Environmental and Civil Engineering

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To get a better understanding of the effect of drying/wetting cycles on the mechanical cyclic behaviours of silty clay, cyclic triaxial tests were performed on slurry consolidated silty clay specimens with various numbers of drying/wetting cycles, matric suctions, cyclic shear stresses and loading frequencies. Additionally, the soil microstructure before and after drying/wetting cycles was investigated with scanning electron microscope. The laboratory test results indicate that the threshold cyclic stress ratio and cyclic shear strength increased significantly at low matric suction due to drying/wetting cycles, with the changes becoming more gradual as matric suction continues to increase. The variation of mechanical cyclic behaviours is attributed to the irreversible compression, development of micro-cracks and lower degree of saturation. The overall influence of drying/wetting cycles depends on the weights of the three factors. For the specimens subjected to drying/wetting cycles, the cyclic shear strength increased with the increasing of loading frequency. Scanning electron micrographs show that soil particles were drawn closer together during the drying/wetting cycle process which led to variation of microstructure, resulting in alteration of the mechanical behaviours. The variation of the mechanical behaviours is consistent with the reconstruction of the soil microstructure.

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“…It has been well researched that a small presence of gas bubbles in sand can greatly improve the stress-strain behavior of loose sand under cyclic loading. This has been shown by a number of researchers via a number of different testing techniques including cyclic triaxial tests (Bouferra et al 2007;Okamura and Soga 2006;Pietruszczak et al 2003;Tamura et al 2002;Tsukamoto et al 2002;Xia and Hu 1991), cyclic torsional shear tests (Altun and Goktepe 2006;Sherif et al 1977;Yoshimi et al 1989) and shaking Yegian et al 2006Yegian et al , 2007. Under monotonic loading, the behavior has been shown to depend on the density of the sand and stability of the gas.…”

Section: 32effects Of Gas On the Stress-strain Behavior Of Sandmentioning

confidence: 95%

Engineering properties of saturated and biogas desaturated sand

Hansen

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Cyclic Stress-Strain Behavior of Partially Saturated Soils

Cited by 15 publications

References 0 publications

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

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

Influence of drying/wetting cycles on the mechanical cyclic behaviours of silty clay

Engineering properties of saturated and biogas desaturated sand

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