Effect of sample preparation method on mechanical behaviour of fibre-reinforced sand

Gao, Zhiwei; Huang, Maosong

doi:10.1016/j.compgeo.2021.104007

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…The method of preparation of the sample may affect the fibre arrangement and homogeneity of the prepared samples. The influence of the sample preparation method on the stress–strain behaviour of pure Leighton Buzzard sand and sand with 0.25% by weight of fibres was studied by Gao and Huang [ 34 ]. Moist tamping (MT) and moist vibration (MV) methods were used.…”

Section: Effect Of Sample Preparation Methodsmentioning

confidence: 99%

“…All points representing dilatant failure states lie almost on the straight frictional state line (FSL) drawn for

31.8° ( Figure 9 ). The method of sample preparation has no significant influence on the behaviour of pure Leighton Buzzard sand during shear [ 34 ].…”

Section: Effect Of Sample Preparation Methodsmentioning

confidence: 99%

“… Relationships for Leighton Buzzard sand with 0.25% of fibres: ( a )

and ( b )

(experimental data from [ 34 ]). …”

Section: Figurementioning

confidence: 99%

“… Stress ratio–plastic dilatancy relationships for Leighton Buzzard sand with 0.25% of fibres (based on the experimental data from [ 34 ]). …”

Section: Figurementioning

confidence: 99%

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Stress–Dilatancy Behaviourof Fibre-Reinforced Sand

Szypcio

Dołżyk-Szypcio²,

Chmielewska³

2023

Materials

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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.

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Section: Effect Of Sample Preparation Methodsmentioning

confidence: 99%

“…All points representing dilatant failure states lie almost on the straight frictional state line (FSL) drawn for

31.8° ( Figure 9 ). The method of sample preparation has no significant influence on the behaviour of pure Leighton Buzzard sand during shear [ 34 ].…”

Section: Effect Of Sample Preparation Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Stress–Dilatancy Behaviourof Fibre-Reinforced Sand

Szypcio

Dołżyk-Szypcio²,

Chmielewska³

2023

Materials

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“…In addition, the distribution and orientation of fibers after sample preparation also affect the effectiveness of fiber reinforcement. The effect of short flexible fibers on the compressive strength of soils has been demonstrated by numerous studies [1][2][3][4][5][6][7][8][9][10] through various experimental programs, including direct and ring shear tests and consolidated drained and undrained triaxial tests. Most previous studies reported that the fibers affected the compressive strength considerably.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fibers on the Compressive and Tensile Strengths of Sand Considering Failure Mode

Ganiev¹

2022

GEOMATE

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In geotechnical engineering, fiber reinforcement for improving the stability and strength of soils is of considerable interest. According to previous studies, fibers enhance compressive strength significantly, whereas the contribution of fibers in extension is limited. However, this phenomenon has not been analyzed comprehensively. Therefore, conventional triaxial compression and extension tests were conducted under both drained and undrained conditions on fiber-reinforced sand specimens to elucidate the influence of fibers on tensile strength. The compression behavior was significantly influenced by the presence of fibers and confining pressure, independent of the drainage conditions. However, in the extension experiments, the properties of the fiber-reinforced sand under drained conditions differed from those of unreinforced specimens. The tensile strength of the fiber-reinforced sand was relatively enhanced under undrained conditions. Both unreinforced and fiber-reinforced sands experienced deformation throughout the entire height of the specimen, and their central regions bulged under loading conditions. With an increase in confining pressure under unloading conditions, the unreinforced sand specimen developed a double "necking" shear band in the center with more pronounced strain localization. In contrast, the failure modes of fiber-reinforced sand in drained conditions were characterized by strain localization and shear bands transferred to the bottom part of specimens. According to the experimental results and their repeatability, a conventional triaxial extension test may be insufficient to evaluate tensile strength accurately. In addition, a possible explanation for the fiber-sand interaction mechanism has been proposed based on the obtained results and failure mode analysis.

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