Stress–Dilatancy Behaviourof Fibre-Reinforced Sand

Abstract

This paper analyses the stress–strain behaviour of fibre-reinforced sand using the results obtained by drained triaxial compression tests presented in the literature. The general stress–plastic dilatancy equation of the Frictional State Concept has been used to describe the behaviour of fibre-reinforced sand for different shear phases. The behaviour of pure sand is taken as a reference for the behaviour of sand with added fibres. It is shown that the characteristic shear phases can only be determined when the relationships are used, which are very rarely demonstrated in the results of shear tests presented in the literature. It has been shown that tensile strains must occur in order to achieve the strengthening effect of fibre reinforcement. A reduction in the stiffness of the fibre–sand composite is observed in the absence of tensile strains below certain threshold values.

Stress–Strain Behavior of Crushed Concrete as a Special Anthropogenic Soil

“…The general stress ratio-plastic dilatancy relationship using the frictional state concept (FSC) is as follows [24]:…”

“…where 𝜙 𝑜 is the angle of friction at the critical frictional state [24,25]. The definition of critical frictional state and the calculation procedure using 𝜙 𝑜 were provided by Szypcio [24]. For conventional drained triaxial compression, 𝛿𝑞 𝛿𝑝′ ⁄ = 3, and…”

“…Figure 10 shows the stress ratio-plastic dilatancy relationship for the drained triaxial compression test of crushed concrete. The dilatant failure states (DFSs) and maximum curvature of η − D p relationships [24] can be easily identified. Points F in Figure 10 represent the DFSs.…”

“…In many geomaterial models, a critical state is taken as the basis. Recently, a new frictional state concept (FSC) was presented for geomaterials under triaxial compression [24] as an extension of the critical state concept [25]. In this work, the stress-plastic dilatancy relationships for drained and undrained triaxial compression tests were investigated in the light of the FSC.…”

Numerical Investigation of Mechanical Performance and Micro-Structure Failure of Polymer-Fiber Reinforced Sand

“…Zenon et al [21] analyzed the stress-strain characteristics of fiber-reinforced sandy soils by means of triaxial drainage compression tests and found that tensile strains had to be generated in order for the fiber reinforcement to be demonstrated.…”