Numerical Study of Laterally Loaded Pile in Unsaturated Soils

Lalicata, Leonardo Maria; Rotisciani, G. M.; Desideri, Augusto; Casini, Francesca; Thorel, Luc

doi:10.1007/978-3-030-21359-6_76

Cited by 6 publications

(2 citation statements)

References 12 publications

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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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Section: Constitutive Modelmentioning

confidence: 99%

Unsaturated structured soils: constitutive modelling and stability analyses

2021

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“…In many applications, most of the interested soil lies above the ground water table (GWT) and is therefore partly saturated. Although traditional methods for the design of laterally loaded piles assume that the soil is either dry or fully saturated, the effect of partial saturation is lately attracting fresh research interest [2][3][4][5][6]. Recently, Lalicata et al [7] extended the well-known Broms method for dry or saturated soils to unsaturated soils by taking into account the combined effects of the position of the GWT and the cohesion of the unsaturated soil above it.…”

Section: Introductionmentioning

confidence: 99%

An analytical method to evaluate the capacity of laterally loaded piles in unsaturated soils

2023

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The growing pressures of climate change, increased usage and unprecedented geo-hazards impose a modification in the way civil engineering structures are designed and constructed. This isparticularly true for geotechnical works, which are very sensitive to changes of environmental conditions. For instance, the response of a pile under lateral loading is strongly influenced by the stiffness and strength of the first few metres of soil below the surface, which are often partly saturated. To consider this effect, the present paper describes an analytical method, which extends the well-known Broms approach to predict thelateral capacity of piles in unsaturated soils. More specifically, the proposed method considers the combined effects of the position of the ground water table and the extra strength of the partially saturated soil above it. Compared to Broms approach, the solution introduces four additional non-dimensional parameters that relate the soil-water retention behaviour to the geometry of the pile. The method provides a direct evaluation of the lateral pile capacity in partly saturated soils, which can be used as a basis for more accurate design.

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Conceptual p–y Curve Framework for a Single Pile in Cohesionless Soils with Variable Degrees of Saturation

Komolafe

Ghayoomi

2023

Geotech Geol Eng

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Numerical Study of Laterally Loaded Pile in Unsaturated Soils

Cited by 6 publications

References 12 publications

Unsaturated structured soils: constitutive modelling and stability analyses

Unsaturated structured soils: constitutive modelling and stability analyses

An analytical method to evaluate the capacity of laterally loaded piles in unsaturated soils

Conceptual p–y Curve Framework for a Single Pile in Cohesionless Soils with Variable Degrees of Saturation

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