A multiaxial constitutive model for fibre-reinforced sand

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, dependent on strain increment direction. While constitutive models that are able capture FRS have been proposed for conventional triaxial compression extension conditions only, this paper proposes first time a full model formulated general multiaxial stress space. The new developed based assumption deformation skeleton. In turn, fibre presence affects void ratio effective soil skeleton, which governs elastic properties, dilatancy plastic hardening FRS. effect considered through an variable characterises relative between loading direction tensor tensor. does not require direct measurement stress–strain relationship individual fibres. Although under conditions, parameters associated with inclusion can be determined test results, provided fibres known. has used predict Hostun RF (S28) conditions. Satisfactory agreement experimental data predictions observed.