Modeling rainfall infiltration through coarse and fine-grained unsaturated geomaterials

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

doi:10.1201/b17034-73

Cited by 5 publications

(5 citation statements)

References 8 publications

(6 reference statements)

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“…The mechanical behaviour of the solid skeleton is described with a Modified Cam Clay Model (MCCM) extended to unsaturated conditions [24]. The MCCM well-reproduces the response of fine-grained soils under a broad range of initial conditions during wetting and loading processes, as demonstrated for single elements by Casini [25] and Casini et al [26] as well as by other researchers [27][28][29] for boundary value problems. The model is characterised by a relatively simple mathematical formulation described in detail in Rotisciani et al [30].…”

Section: Constitutive Modellingmentioning

confidence: 68%

A Numerical Model to Study the Response of Piles under Lateral Loading in Unsaturated Soils

et al. 2021

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The interaction between a laterally loaded pile and the surrounding soil is typically limited to the shallower soil layer. Often, this zone is above the water table and therefore the interaction takes place under unsaturated conditions. The available evidence is scarce but suggests that unsaturated conditions play a major role on the pile’s response. The actual mechanisms governing the soil–pile interaction under unsaturated soil conditions are not understood entirely, and this paper provides a useful insight on this topic. The analysis is carried out with a fully coupled three-dimensional numerical model, the soil behaviour is simulated with a Modified Cam Clay Model extended to unsaturated conditions. The model accounts for the increase in stiffness and strength of unsaturated soils as well as the volumetric collapse upon wetting. The constitutive model is calibrated on the laboratory data and validated against centrifuge data with satisfying agreement. The results highlight the substantial differences in the soil reaction against the pile depending on different water saturation profiles. The study also shows that the influence of unsaturated conditions on the pile response increases as the pile’s flexibility increases. Comparing the findings with currently available design methods such as the p–y curves, it is found that these do not adequately describe the unsaturated soil reaction against the pile, which opens the door for new research in the field. The proposed numerical model is a promising tool to further investigate the mechanisms underlying the soil–pile interaction under unsaturated soils.

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Section: Constitutive Modellingmentioning

confidence: 68%

A Numerical Model to Study the Response of Piles under Lateral Loading in Unsaturated Soils

et al. 2021

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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

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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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Modeling rainfall infiltration through coarse and fine-grained unsaturated geomaterials

Cited by 5 publications

References 8 publications

A Numerical Model to Study the Response of Piles under Lateral Loading in Unsaturated Soils

A Numerical Model to Study the Response of Piles under Lateral Loading in Unsaturated Soils

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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