An elasto-plastic model for unsaturated soil incorporating the effects of suction and degree of saturation on mechanical behaviour

Gallipoli, Domenico; Gens, Antonio; Sharma, Raghav; Vaunat, Jean

doi:10.1680/geot.2003.53.1.123

Cited by 479 publications

(86 citation statements)

References 15 publications

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“…It was first derived by Fisher (1926) based on the air-water interface between two identical spheres. Although this equation is derived based on granular material, it also works well for fine-grained soils, as reported by Gallipoli et al (2003). Therefore, this variable is considered and used to model hysteretic G 0 behavior in this study.…”

Section: Mathematical Formulationsmentioning

confidence: 93%

“…To describe these two mechanisms explicitly, Gallipoli et al (2003) proposed the following two constitutive variables:…”

Section: Mathematical Formulationsmentioning

confidence: 99%

“…These two constitutive variables have clear physical meanings. The first one (p * ) denotes the average stress between soil particles, while the bonding variable  was proposed by Gallipoli et al (2003) as a scalar constitutive variable for unsaturated soils. The bonding variable is related to the inter-particle normal forces exerted by water menisci, and it is a function of the soil suction and the degree of saturation.…”

Section: Mathematical Formulationsmentioning

confidence: 99%

“…1. This relationship can be described by the following equation (Gallipoli et al, 2003;Zhou et al, 2015):…”

Section: Mathematical Formulationsmentioning

confidence: 99%

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A simple model for the hysteretic elastic shear modulus of unsaturated soils

Zhou

2016

J. Zhejiang Univ. Sci. A

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Abstract:Considering the great importance of the elastic shear modulus G 0 of unsaturated soils to the serviceability of many geo-structures in geo-energy and geo-environmental engineering, some semi-empirical models have been reported for the G 0 of unsaturated soils. Existing models require at least three parameters and the calibration of the model parameters requires extensive time-consuming unsaturated soil tests. In this study, a simple semi-empirical model is proposed for the hysteretic G 0 of unsaturated soils, requiring only two parameters. The constitutive variables of the mean Bishop's stress and a bonding variable are adopted for considering the average stress between soil particles and the additional normal forces between soil particles provided by water menisci. The derived equation is applied to simulate the G 0 of unsaturated silts and sands. Comparisons between the measured and calculated results demonstrate that the proposed equation is able to describe the influences of various factors on G 0 , including mean net stress, suction, wetting-drying, and void ratio.

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Section: Mathematical Formulationsmentioning

confidence: 93%

“…To describe these two mechanisms explicitly, Gallipoli et al (2003) proposed the following two constitutive variables:…”

Section: Mathematical Formulationsmentioning

confidence: 99%

Section: Mathematical Formulationsmentioning

confidence: 99%

“…1. This relationship can be described by the following equation (Gallipoli et al, 2003;Zhou et al, 2015):…”

Section: Mathematical Formulationsmentioning

confidence: 99%

See 2 more Smart Citations

A simple model for the hysteretic elastic shear modulus of unsaturated soils

Zhou

2016

J. Zhejiang Univ. Sci. A

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“…More complex constitutive models, where sophisticated stress variables are employed, or which incorporate a SWRC within their formulation (e.g. Wheeler et al, 2003;Gallipoli et al, 2003a;Sheng et al, 2008), may not be suitable for use with the SWRC model proposed. A classification of constitutive models according to the stress variables adopted is given by Gens (2010), and an overview of recent advances in constitutive modelling of unsaturated soils is given by D' Onza et al (2011).…”

Section: Introductionmentioning

confidence: 99%

A three-dimensional hysteretic soil-water retention curve

Tsiampousi¹,

Zdravković²,

Potts³

2013

Géotechnique

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A three-dimensional hysteretic soil-water retention curve A. TSIAMPOUSI Ã , L. ZDRAVKOVIĆ a nd D. M. P OTTS One of the most important features in unsaturated soil mechanics is the soil-water retention curve and its coupling to the mechanical component of soil behaviour. It has long been recognised that the retention curve exhibits significant hysteresis, and that it is affected by the specific volume. Several attempts have been made in the past to model this behaviour. A novel approach is proposed herein, which accounts for both the hydraulic hysteresis and the specific volume dependence of the retention relationship in a three-dimensional formulation. The primary and the scanning paths are simple geometric curves, which have a common tangent at the point of intersection, ensuring a smooth transition from scanning to primary paths. A small number of parameters are required to define the primary paths, and no fitting parameters are necessary for generation of the scanning paths. As knowledge of the specific volume and its variation is required, the retention model needs to be employed in conjunction with a constitutive model capable of reproducing the complex behaviour of unsaturated soils. To guarantee consistency with the retention model, the degree of saturation needs to be incorporated in the specific volume-suction relationship adopted within the constitutive model. To accommodate such a feature when absent, a new expression for the soil compressibility with suction as a function of the degree of saturation is proposed. Simulations of laboratory experiments on unsaturated soils, involving cyclic changes of applied suction, demonstrate the effectiveness of the proposed modelling approach.

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A method for characterizing desiccation-induced consolidation and permeability loss of organic soils

Arnold

Ghezzehei

2015

Water Resour. Res.

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A new method was developed to measure soil consolidation by capillary suction in organic soils. This method differs from previous methods of measuring soil consolidation in that no external load is utilized and only the forces generated via capillary suction consolidate the soil matrix. This limits the degree of consolidation that can occur, but gives a more realistic ecological perspective on the response of organic soils to desiccation in the field. This new method combines the principles behind a traditional triaxial cell (for measurements of volume change), a pressure plate apparatus, (to facilitate drainage by capillary suction), and the permeameter, (to measure saturated hydraulic conductivity) and allows for simultaneous desaturation of the soil while monitoring desiccation-induced volume change in the soil. This method also enables detection of historic limit of dryness. The historic limit of dryness is a novel concept that is unique to soils that have never experienced drying since their formation. It is fundamentally equivalent to the precompression stress of externally loaded soils. This method is particularly important for forecasting structural and hydrologic changes that may occur in soils that were formed in very wet regimes (e.g., wet meadows at the foot of persistent snowpacks and permafrost peats) as they respond to a changing climate.

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An elasto-plastic model for unsaturated soil incorporating the effects of suction and degree of saturation on mechanical behaviour

Cited by 479 publications

References 15 publications

A simple model for the hysteretic elastic shear modulus of unsaturated soils

A simple model for the hysteretic elastic shear modulus of unsaturated soils

A three-dimensional hysteretic soil-water retention curve

A method for characterizing desiccation-induced consolidation and permeability loss of organic soils

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