Hydro-mechanical response of collapsible soils under different infiltration events

Rotisciani, G. M.; Sciarra, Giulio; Casini, Francesca; Desideri, Augusto

doi:10.1002/nag.2359

Cited by 20 publications

(23 citation statements)

References 51 publications

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“…The MCCM is completely defined by six constitutive parameters that can be easily determined by performing few laboratory tests. The values reported in Table refer to the volcanic ash taken from the site of Cervinara . In order to emphasize the effects of the hydro‐mechanical coupling, the value adopted for b is greater than that deduced from laboratory test results; nevertheless, it is consistent with the experimental studies conducted by Cui and Delage, Sharma, and Thorel et al…”

Section: Constitutive Modelsupporting

confidence: 71%

“…The well‐known Van Genuchten expression has been employed for the retention curve definition:

S_{r} = S_{r, italicres} + ((), 1 - S_{r, italicres}) / {[1 + {((), αs)}^{n}]}^{m},

where parameters α , n , and m have been determined on the basis of laboratory test results . The adopted WRC neglects both the effects of the hydraulic hysteresis and the dependency on the current void ratio (see curve WRC 1 in Figure ).…”

Section: Constitutive Modelmentioning

confidence: 99%

See 1 more Smart Citation

Numerical analysis of wetting‐induced instabilities in partially saturated soils under plane strain conditions

Rotisciani

Desideri

Prisco

2019

Num Anal Meth Geomechanics

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Summary This paper concerns the hydromechanical stability of partially saturated soils during wetting. The response of a loose silty sand is numerically/theoretically investigated with the main aim of identifying both triggering mechanisms and predisposing factors to instability. This latter is testified by both a rapid increase in the pore water pressure and an unexpected loss of numerical convergence. The study has been conducted at different scales from laboratory tests to boundary value problems, and in both cases, the controllability theory has been employed to both interpret and justify the numerical results.

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Section: Constitutive Modelsupporting

confidence: 71%

“…The well‐known Van Genuchten expression has been employed for the retention curve definition:

S_{r} = S_{r, italicres} + ((), 1 - S_{r, italicres}) / {[1 + {((), αs)}^{n}]}^{m},

Section: Constitutive Modelmentioning

confidence: 99%

Numerical analysis of wetting‐induced instabilities in partially saturated soils under plane strain conditions

Rotisciani

Desideri

Prisco

2019

Num Anal Meth Geomechanics

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“…The hydro-mechanical behaviour of the solid skeleton is described using the Modified Cam-Clay model extended to unsaturated conditions ( [2]). The ability of this model to reproduce the response of elementary soil volumes has been verified over the years by several authors ( [3], [4], [5]). The model has been validated also in boundary value problems such as a real dam by [6], and the back analyses of a shallow tunnel ( [7]).…”

Section: Introductionmentioning

confidence: 79%

“…MCCM is an elastic-plastic constitutive model, commonly used to reproduce the stress-strain response of fine grained soils. A detailed description of the mathematical formulation and the characteristics of this model can be found in [3,5].…”

Section: Numerical Modelmentioning

confidence: 99%

Modelling of imbibition process in an embankment scale model

et al. 2016

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Abstract. This paper aims to investigate the hydro-mechanical behaviour of a loosely compacted embankment during an inundation event. This study is based on the results of a centrifuge test carried out on a small-scale embankment model made of an artificially compacted clay-sand mixture. The wetting-induced displacements are analyzed and interpreted by means of a constitutive model adapted to unsaturated conditions. The numerical predictions are presented in terms of time evolutions of settlements, as well as, spatial distributions of vertical displacements. These profiles are compared to those experimentally observed in order to validate the predictive capabilities of the model on a boundary value problem. Moreover, the stress paths followed by elementary soil elements located at different depths are analyzed to emphasize the stress and strain variations due to capillary rise.

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“…Alternatively, any variation in the mechanical loading can exert an effect on the infiltration process. It is indeed the hydromechanical coupled response of a partially saturated porous medium that is responsible for the most common instabilities associated with water infiltration: landslides and excessive settlements, due to collapse or shear strength reduction [1,2].…”

Section: Introductionmentioning

confidence: 99%

The Role of Surface Infiltration in Hydromechanical Coupling Effects in an Unsaturated Porous Medium of Semi-Infinite Extent

Selvadurai

Yang

2017

Geofluids

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Rainfall infiltration into an unsaturated region of the earth's surface is a pervasive natural phenomenon. During the rainfall-induced seepage process, the soil skeleton can deform and the permeability can change with the water content in the unsaturated porous medium. A coupled water infiltration and deformation formulation is used to examine a problem related to the mechanics of a two-dimensional region of semi-infinite extent. The van Genuchten model is used to represent the soil-water characteristic curve. The model, incorporating coupled infiltration and deformation, was developed to resolve the coupled problem in a semi-infinite domain based on numerical methods. The numerical solution is verified by the analytical solution when the coupled effects in an unsaturated medium of semi-infinite extent are considered. The computational results show that a numerical procedure can be employed to examine the semi-infinite unsaturated seepage incorporating coupled water infiltration and deformation. The analysis indicates that the coupling effect is significantly influenced by the boundary conditions of the problem and varies with the duration of water infiltration.

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Hydro-mechanical response of collapsible soils under different infiltration events

Cited by 20 publications

References 51 publications

Numerical analysis of wetting‐induced instabilities in partially saturated soils under plane strain conditions

Numerical analysis of wetting‐induced instabilities in partially saturated soils under plane strain conditions

Modelling of imbibition process in an embankment scale model

The Role of Surface Infiltration in Hydromechanical Coupling Effects in an Unsaturated Porous Medium of Semi-Infinite Extent

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