Hydromechanical behavior of an embankment during inundation

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

doi:10.1139/cgj-2016-0174

Cited by 14 publications

(8 citation statements)

References 29 publications

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“…In the MCCM, the preconsolidation pressure p c ' is obtained once known the initial conditions in terms of effective stresses, void ratio, and saturation degree. In the compressibility plane, p c ' corresponds to the abscissa of the intersection point between the unloading reloading line passing through the initial stress state and the normal consolidation line related to S r0 [11]. As expected, the soil results overconsolidated.…”

Section: Numerical Modellingmentioning

confidence: 63%

Numerical modelling of the response of an unsaturated silty soil under wetting and gravitational loading processes

et al. 2020

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This paper presents the results of a numerical study aiming at simulating the response of an unsaturated fine-grained soil under wetting and gravitational loading processes. This study is based on the results of some centrifuge tests carried out to assess the influence of partial saturation on the laterally loaded pile response. The hydro-mechanical behaviour of the silty soil is described using a constitutive model adapted to unsaturated conditions. The model predictions are compared with the measurements provided by LVDTs and laser transducers in the first phases of the experimental study. Besides validating the model, the numerical study aimed at investigating the influence of the after-compaction conditions on both the displacement field and the evolution of the more significant state variables during imbibition and gravitational loading processes. Finally, an additional analysis is conducted to determine the effects of the pile installation on the soil response.

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Section: Numerical Modellingmentioning

confidence: 63%

Numerical modelling of the response of an unsaturated silty soil under wetting and gravitational loading processes

et al. 2020

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“…The second and third terms describe the strain-induced structure degradation using two separate negative exponential damage-type forms. The last term represents the simplest form of the hydraulic hardening that allows capturing most of the observed phenomena for unsaturated soils as, for example, the increase of the preconsolidation pressure with suction, and the wetting-induced collapse [17,35,49,51]. It worth noting that this expression is valid only when S r is not far from the unity and water menisci are homogeneously distributed over the soil volume [13], as assumed in the following.…”

Section: Constitutive Modelmentioning

confidence: 99%

Unsaturated structured soils: constitutive modelling and stability analyses

2021

Self Cite

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The paper presents a new single-surface elasto-plastic model for unsaturated cemented soils, formulated within the critical state soil mechanics framework, which should be considered as an extension to unsaturated conditions of a recently proposed constitutive law for saturated structured soils. The model has been developed with the main purpose of inspecting the mechanical instabilities induced in natural soils by bond degradation resulting from the accumulation of plastic strains and/or the changes in pore saturation. At this scope, the constitutive equations are used to simulate typical geotechnical testing conditions, whose results are then analysed in light of the controllability theory. The results of triaxial tests on an ideal fully saturated cemented soil and on the corresponding unsaturated uncemented one are first discussed, aiming at detecting the evidence of potentially unstable conditions throughout the numerical simulations. This is followed by similar analyses considering the combined effects of both the above features. For each analysed case, a simple analytical stability criterion is proposed and validated against the numerical results, generalizing the results, and highlighting the crucial role of state variables and model parameters on the possible occurrence of failure conditions.

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“…This model is characterized by both a relatively simple mathematical formulation and few physically meaningful constitutive parameters. Despite its simplicity, the MCCM is capable of reproducing the hydro‐mechanical response observed during wetting for both REV and BVP …”

Section: Constitutive Modelmentioning

confidence: 99%

“…Despite its simplicity, the MCCM is capable of reproducing the hydro-mechanical response observed during wetting for both REV and BVP. [27][28][29][30][31] MCCM is formulated within the framework of critical soil mechanics in terms of Bishop's effective stresses, defined as σ ′ ij ¼ σ ij þ χ s δ ij , coinciding χ with S r . Since the saturation levels considered in this study are far from the residual values, Bishop's relation remains a valid expression for effective stresses, 32,33 if the constitutive model is suitably modified as is described here below.…”

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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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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Hydromechanical behavior of an embankment during inundation

Cited by 14 publications

References 29 publications

Numerical modelling of the response of an unsaturated silty soil under wetting and gravitational loading processes

Numerical modelling of the response of an unsaturated silty soil under wetting and gravitational loading processes

Unsaturated structured soils: constitutive modelling and stability analyses

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

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