The Relationship Between the Mechanical Behavior and the State of Porewater in Unsaturated Soil

Karube, Daizo; Kato, Seishiro; Hamada, K.; Honda, Michinori

doi:10.2208/jscej.1996.535_83

Cited by 32 publications

(26 citation statements)

References 3 publications

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“…This phenomenon can be understood by that when the degree of saturation is relatively small almost water exists within unsaturated soil as meniscus water surrounding all inter-particle contact points and thereby the water is di‹cult to be extruded under constant suction during loading. On the other hand, when the degree of saturation is relatively large the water exists within unsaturated soil as meniscus water and bulk water occupying void spaces (Karube et al, 1996). The bulk water is easy to be extruded during loading even under constant suction and thereby the water content decreases during loading.…”

Section: Water-retention Behaviour Of Compacted Soil At Different Denmentioning

confidence: 99%

A Three-Dimensional Elastoplastic Model for Unsaturated Compacted Soils with Hydraulic Hysteresis

Sun

Cui

Matsuoka

et al. 2007

Soils and Foundations

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This paper presents a three-dimensional elastoplastic model for predicting the hydraulic and stress-strain-strength behaviour of unsaturated soils. The model is generalized using the transformed stress method to three-dimensional stress states by assuming that the shapes of the failure surface and the yield surface in the deviatoric plane of the average skeleton stress space are given by the SMP criterion. Hydraulic hysteresis in the water-retention behaviour is modeled as an elastoplastic process with the elastic region of the saturation degree decreasing with increasing suction in the S r -log s plane. The eŠect of void ratio on the water-retention behaviour is studied using test data obtained from controlled-suction triaxial tests on unsaturated compacted clay. The eŠect of change in degree of saturation on the stress-strain-strength behaviour and the eŠect of change in void ratio on the water-retention behaviour are taken into consideration in the model, in addition to the eŠect of suction on the hydraulic and mechanical behaviour. Model predictions of the stress-strain and water-retention behaviour are compared with those obtained from triaxial tests on unsaturated soil along isotropic compression, triaxial compression and triaxial extension stress paths with or without variation in suction. The comparisons indicate that the model has well predicting capabilities to reproduce the hydraulic and mechanical behaviour of unsaturated soils under three-dimensional stress states.

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Section: Water-retention Behaviour Of Compacted Soil At Different Denmentioning

confidence: 99%

A Three-Dimensional Elastoplastic Model for Unsaturated Compacted Soils with Hydraulic Hysteresis

Sun

Cui

Matsuoka

et al. 2007

Soils and Foundations

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show abstract

“…Recently, some constitutive models for unsaturated soil have been proposed and developed for the application to soil W water-coupled analysis (Alonso et al, 1988(Alonso et al, , 1990Kohgo et al, 1993aKohgo et al, , 1993bKohgo et al, , 1995Karube et al, 1996Karube et al, , 1997Karube et al, , 2001). The behavior of unsaturated soil depends not only on suction, but also on the degree of saturation.…”

Section: Constitutive Model and Fem Program For Unsaturated Soilmentioning

confidence: 99%

“…However, it is not a unique relationship for both drying and wetting, and shows hysteresis. Of the studies mentioned above, only the constitutive model proposed by Karube et al (1996Karube et al ( , 1997Karube et al ( , 2001) takes into account the hysteresis shown on soil-water retention curve. In their model, the application of any given soilwater retention curve enables the prediction of the behavior of unsaturated soil.…”

Section: Constitutive Model and Fem Program For Unsaturated Soilmentioning

confidence: 99%

“…A great concern in unsaturated soil mechanics is how to quantify the suction eŠects. Karube et al (1996) categorized the pore water into two types, according to the suction eŠects, namely, bulk water and meniscus water, as can be seen in Fig. 1.…”

Section: Constitutive Model and Fem Program For Unsaturated Soilmentioning

confidence: 99%

“…The constitutive model, which is proposed by Karube et al (1996Karube et al ( , 1997 and modiˆed by Karube and Kawai (2001), is formulated for initial and boundary problems and coded as DACSAR-U (Iizuka et al, 2000). A deepˆll, which consists of compacted, unsaturated soil, was analyzed with DACSAR-U.…”

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confidence: 99%

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Non-Uniform Settlement of Compacted Earth Structures Caused by the Deformation Characteristics of Unsaturated Soil on Wetting

Kawai

Iizuka

Hayakawa³

et al. 2007

Soils and Foundations

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The soil W water-coupled analysis for unsaturated soil mechanics with theˆnite element method is used to express the behavior of compacted earth structures exposed to rainfall. The constitutive model, which is proposed by Karube et al. (1996Karube et al. ( , 1997 and modiˆed by Karube and Kawai (2001), is formulated for initial and boundary problems and coded as DACSAR-U (Iizuka et al., 2000). A deepˆll, which consists of compacted, unsaturated soil, was analyzed with DACSAR-U. DiŠerent patterns of rainfall were applied to deepˆlls inˆnite element simulations. As a result, non-uniform settlement of deepˆll can be calculated and the magnitude of settlement of deepˆlls is dependent on the amount of collapse, namely, the compression due to the decrease in suction. Moreover, delayed settlement due to rainfall and an accumulation of an irreversible settlement due to cyclic rainfall was observed.

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Numerical Modelling of Deformation for Partially Saturated Slopes Subjected to Rainfall

Tiwari

Kawai

Viradeth

2014

Landslide Science for a Safer Geoenvironment

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The Relationship Between the Mechanical Behavior and the State of Porewater in Unsaturated Soil

Cited by 32 publications

References 3 publications

A Three-Dimensional Elastoplastic Model for Unsaturated Compacted Soils with Hydraulic Hysteresis

A Three-Dimensional Elastoplastic Model for Unsaturated Compacted Soils with Hydraulic Hysteresis

Non-Uniform Settlement of Compacted Earth Structures Caused by the Deformation Characteristics of Unsaturated Soil on Wetting

Numerical Modelling of Deformation for Partially Saturated Slopes Subjected to Rainfall

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