Geosynthetic-reinforced and pile-supported embankments: theoretical discussion of finite difference numerical analyses results

Mangraviti, Viviana; Flessati, Luca; Prisco, Claudio di

doi:10.1080/19648189.2023.2190400

Cited by 7 publications

(20 citation statements)

References 75 publications

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“…For the sake of clarity, hereafter, the mechanical response of GRPS embankments is described in the light of the numerical results obtained by Mangraviti et al, 35 where the problem schematised in Figure 1(A) was considered and the effects of the layer-by-layer embankment construction under drained conditions of GRPS embankments studied in detail. In agreement with what already suggested in the literature, 26,[36][37][38]40,43,69,70 the authors reduced the problem to the analysis of one axisymmetric cell, considered as representative for the central part of the embankment.…”

Section: Numerical Evidence For Grps Embankmentsmentioning

confidence: 99%

“…During the embankment construction, Mangraviti et al 35 have shown that, due to the difference in stiffness between pile and foundation soil, differential displacements accumulate at the embankment base. Consequently, (i) strains localise in the proximity of the pile edge (defining the "process height", see Section 2.1), (ii) stresses tend to migrate towards the piles ("arching effect", in Section 2.2) and the geosynthetic reinforcement is progressively loaded (membranal effect, in Section 2.3).…”

Section: Numerical Evidence For Grps Embankmentsmentioning

confidence: 99%

“…In the past, many authors have disregarded the role of large displacements 21,[26][27][28][29][30][31][32][33][34] only very recently Mangraviti et al 35 took into consideration the large-displacement membranal behaviour of reinforcements.…”

Section: Introductionmentioning

confidence: 99%

“…Representative unit cell for both (B) triangular and (C) square piles pattern according to McGuire. 61 In this paper the same approach used by di Prisco et al 40 for CPS embankments is used to define a new upscaled constitutive relationship for GRPS embankments by considering large-displacements finite difference numerical analyses results (implemented in FLAC3D 6.0 67 ) by Mangraviti et al 35 The new model can be used to optimise the design of both piles and geosynthetic reinforcement with the aim of increasing the sustainability of GRPS embankments. 68 The problem analysed in this paper is ideal: the pile shaft is assumed to be smooth, the piles to be founded on a rigid bedrock and the embankment construction to take place under drained conditions.…”

Section: Introductionmentioning

confidence: 99%

“…However, since the model is based on a substructuring of the spatial domain, it can be extended to the case of floating piles, hydromechanical coupling and rough pile shafts. 43 The paper is structured as it follows: for the sake of clarity in Section 2 the main numerical evidences from Mangraviti et al 35 are summarised, giving an interpretation of the mechanical behaviour of GRPS embankments; in Section 3 the new constitutive model for GRPS embankments is illustrated; in Section 4 the model is verified against the numerical results from Mangraviti et al 35 and in Section 5 it is validated against field measurements. Finally, in Section 6 a practical application of the constitutive model is presented.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical modelling of the mechanical response of geosynthetic‐reinforced and pile‐supported embankments

Mangraviti

Flessati

Prisco

2023

Num Anal Meth Geomechanics

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Piled foundations are commonly employed to reduce settlements in artificial earth embankments founded on soft soil strata. To limit the number of piles and, consequently, construction costs, popular is the use of geosynthetic reinforcements laid at the embankment base. Nowadays, the complex interaction between geosynthetics, piles and soil is not yet fully understood and, in the scientific literature, simplified displacement‐based approaches to choose reinforcements, pile diameter and spacing are missing. In this paper, the authors, starting from the critical analysis and theoretical interpretation of finite difference numerical results, introduce a new mathematical model to rapidly assess both (i) differential/average settlements at the top of the embankment and (ii) maximum tensile forces in the basal reinforcement. The model, conceived to reproduce the response of a pile belonging to the central part of the embankment, is the result of an upscaling procedure based on a suitable sub‐structuring of the spatial domain (an axisymmetric unit cell) and on the concept of plane of equal settlements. For the foundation soil, drained conditions are considered, the pile skin roughness is disregarded, and piles are assumed to get the rigid bedrock. As generalised kinematic variables average and differential settlements are employed, whereas as generalized static ones the embankment height and the geosynthetic axial force. The model is validated against field measurements (where layered foundation soil and pile caps are included) and an application example of the model, used as a preliminary design tool in a displacement‐based perspective, is finally provided.

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Section: Numerical Evidence For Grps Embankmentsmentioning

confidence: 99%

Section: Numerical Evidence For Grps Embankmentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mathematical modelling of the mechanical response of geosynthetic‐reinforced and pile‐supported embankments

Mangraviti

Flessati

Prisco

2023

Num Anal Meth Geomechanics

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Displacement-Based Design of Geosynthetic-Reinforced Pile-Supported Embankments to Increase Sustainability

Mangraviti

2022

Civil and Environmental Engineering for the Sustainable Development Goals

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Although the construction of concrete piles has a relevant environmental footprint, they are commonly used to reduce settlements of embankments on soft soil strata. A more sustainable choice to further reduce settlements (and, consequently, the number of piles) is to place geosynthetics below the embankment. However, existing design methods cannot calculate settlements at the embankment top and cannot be used to optimise the number of piles in a displacement-based design. In this note, an innovative model for assessing settlements at the top of Geosynthetic-Reinforced and Pile-Supported embankments induced by the embankment construction process is presented and validated against finite difference numerical analyses. The model is used to optimise the design of both piles and geosynthetic, and applied to a practical example, where the mass of CO2 saved by designing geosynthetics to reduce the pile number. Graphical Abstract

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An innovative design approach for anchored wire meshes

Boschi,

di Prisco,

Flessati

2023

Acta Geotech.

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Anchored wire meshes are commonly adopted to stabilize potentially unstable soil slopes. This reinforcement technique, employed either as an active or a passive anchoring system, is commonly designed according to ultimate limit state approaches. In this paper, an interaction model, useful for the design of anchored wire meshes, is proposed. The model is based on the results of a series of 3D large displacement finite element numerical analyses, in which the wire mesh mechanical behaviour is modelled as either an elastic or an elastic–plastic membrane. The model is inspired to standard load–displacement curves for shallow foundations, and the wire mesh presence is taken into account by suitably modifying the bearing capacity formula. The proposed model predictions are compared with experimental punching test results. The use of the model, only requiring the definition of geometry and soil–wire mesh mechanical properties, allows the pre-design of the reinforcement system without performing ad hoc finite element numerical analyses.

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Geosynthetic-reinforced and pile-supported embankments: theoretical discussion of finite difference numerical analyses results

Cited by 7 publications

References 75 publications

Mathematical modelling of the mechanical response of geosynthetic‐reinforced and pile‐supported embankments

Mathematical modelling of the mechanical response of geosynthetic‐reinforced and pile‐supported embankments

Displacement-Based Design of Geosynthetic-Reinforced Pile-Supported Embankments to Increase Sustainability

An innovative design approach for anchored wire meshes

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