Nonlinear Stress-Strain Relationship of Soil Reinforced with Flexible Geofibers

Ding, Duowen; Hargrove, S. Keith

doi:10.1061/(asce)1090-0241(2006)132:6(791)

Cited by 17 publications

(8 citation statements)

References 3 publications

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“…Email addresses: d.muirwood@dundee.ac.uk (D. Muir Wood ), andrea.diambra@bristol.ac.uk (A. Diambra ), erdin.ibraim@bristol.ac.uk (E. Ibraim ) elastic behaviour of the material (Ding and Hargrove, 2006) or have been applied to soils reinforced with continuous thread (Texsol) (Villard et al, 1990;di Prisco and Nova, 1993). The two dimensional DEM (Distinct Element Method) has been used to investigate the micromechanical aspects of interaction between grains and fibres and the distribution of the tensile stresses mobilised in the fibres (Ibraim et al, 2006;Ibraim and Maeda, 2007).…”

Section: Introductionmentioning

confidence: 99%

Fibres and soils: A route towards modelling of root-soil systems

Wood

Diambra

Ibraim

2016

Soils and Foundations

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractAddition of flexible fibres to granular, cohesionless soils, has a marked influence on the stress:strain and volumetric response. Experimental observations provide inspiration for the development of continuum models for the mechanical, pre-failure behaviour of such fibre/soil mixtures. Such generic models and the deduced mechanisms of response should be applicable to other combinations of soils and flexible fibres such as plant roots. Two features are particularly important: the distribution of orientations of fibres (no method of preparation produces an isotropic distribution) and the allowance for the volume of void space not only occupied but also influenced by the presence of the fibres. A simple shear element is used as a quasi-one-dimensional demonstrator platform for the presentation of the continuum constitutive model. Such an element represents a familiar configuration in which phenomena such as dilation and friction can be directly observed. A basic constitutive model for sand is adapted to this simple shear element; the fibres are added as a separate component able to withstand tension but without flexural stiffness. As the soil-fibre mixture deforms, the straining of the soil generates stresses in favourably oriented fibres. The model is used to clarify some aspects of the response of fibre-soil mixtures: the influence of fibres on the volumetric behaviour; the existence and nature of asymptotic states; and the stress-dilatancy relationship.

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Section: Introductionmentioning

confidence: 99%

Fibres and soils: A route towards modelling of root-soil systems

Wood

Diambra

Ibraim

2016

Soils and Foundations

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“…Based on the condition of consistency for the yield function [Eq. (10)], flow rule [Eq. (11) and elastic stress-strain relationship (Eq.…”

Section: The Constitutive Equationmentioning

confidence: 99%

“…This model gives reasonable prediction of soil failure but poor simulation of dilatancy and plastic hardening. Ding and Hargrove [10] have derived a nonlinear elastic stress-strain relationship for FRS based on nonlinear elastic stress-strain relationship for soil and a linear elastic stress-strain relationship for fibers. Babu et al [3] used the finite element method to simulate the stress-strain relationship FRS in triaxial compression wherein the soil-fiber interaction and fiber orientation are considered.…”

Section: Introductionmentioning

confidence: 99%

Effective skeleton stress and void ratio for constitutive modeling of fiber-reinforced sand

Gao

Huang

2020

Acta Geotech.

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Inclusion of flexible fibers such as polypropylene and polyester is an effective method for soil improvement, as it significantly enhances the soil strength and ductility. A proper constitutive model is essential for assessing the stability and serviceability of fiber-reinforced slopes/foundations. A new method for constitutive modeling of fiber-reinforced sand (FRS) is proposed. It assumes that the strain of FRS is dependent on the deformation of the sand skeleton only, while the effective skeleton stress and effective skeleton void ratio, which should be used in describing the dilatancy, plastic hardening and elastic stiffness of FRS, are affected by fiber inclusion. The effective skeleton stress is dependent on the shear strain level, and the effective skeleton void ratio is affected by the fiber content and sample preparation method. A critical state FRS model in the triaxial stress space is proposed using the concept of effective skeleton stress and void ratio. Four parameters are introduced to characterize the effect of fiber inclusion on the mechanical behavior of sand, all of which can be easily determined based on triaxial test data on FRS, without measuring the stress-strain relationship of individual fibers. The model is validated by triaxial compression test results on four fiber-reinforced sands under loading conditions with various confining pressures, densities and stress paths. Potential improvement in the model for incorporating fiber orientation anisotropy is discussed.

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“…This model gives reasonable prediction of soil failure but, due to the simple model adopted for the sand matrix, is unable to simulate dilatancy and post-peak softening. Ding & Hargrove (2006) have proposed a model for characterizing the nonlinear elastic stressstrain relationship of FRS. Diambra et al (2010) and Diambra et al (2013) were the first to develop an anisotropic constitutive model for FRS which can satisfactorily describe the stress-strain relationship in both triaxial compression and extension.…”

Section: Introductionmentioning

confidence: 99%

A multiaxial constitutive model for fibre-reinforced sand

Gao

Diambra

2021

Géotechnique

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Fibre orientation in fibre-reinforced sand (FRS) is highly anisotropic due to compaction during sample preparation or field construction. This makes the mechanical behaviour of FRS, such as strength and dilatancy, highly dependent on the strain increment direction. While constitutive models able to capture such anisotropic behaviour of FRS have been proposed for conventional triaxial compression and extension conditions only, this paper proposes for the first time a full anisotropic model for FRS formulated in the general multiaxial stress space. The new model is developed based on the assumption that the strain of FRS is dependent on the deformation of the sand skeleton. In turn, the fibre presence affects the void ratio and effective stress of the soil skeleton, which governs the elastic properties, dilatancy and plastic hardening of the FRS. The effect of anisotropic fibre orientation on the FRS behaviour is considered through an anisotropic variable which characterises the relative orientation between the loading direction tensor and fibre orientation tensor. The model does not require direct measurement of the stress-strain relationship of individual fibres. Though the model is for FRS under multiaxial loading conditions, the parameters associated with the fibre inclusion can be determined based on triaxial test results, provided that the orientation of fibres is known. The model has been used to predict the stress-strain relationship of fibre-reinforced Hostun RF (S28) sand under multiaxial loading conditions. Satisfactory agreement between the experimental data and model predictions is observed.

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Nonlinear Stress-Strain Relationship of Soil Reinforced with Flexible Geofibers

Cited by 17 publications

References 3 publications

Fibres and soils: A route towards modelling of root-soil systems

Fibres and soils: A route towards modelling of root-soil systems

Effective skeleton stress and void ratio for constitutive modeling of fiber-reinforced sand

A multiaxial constitutive model for fibre-reinforced sand

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