Shear Strength of Fiber-Reinforced Sands

Sadek, Salah; Najjar, Shadi; Freiha, Fadi

doi:10.1061/(asce)gt.1943-5606.0000235

Cited by 115 publications

(47 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results show that, in general, the increase in composite strength is in proportion with the fibre factor of the composite. This is in agreement with the soil testing results reported by many researchers such as Zorberg (2002 & 2013), Michalowski and Cermák (2002), Sadek et al (2010), Gray and Ohashi (1983), Gray and Maher (1989) and Diambra et al (2009).…”

Section: Fibre Reinforced Soil Displacements and Strainssupporting

confidence: 82%

“…Figure 2.22 illustrates the model proposed by Gray and Ohashi (1983) investigators (Gray and Ohashi 1983;Gray and AI-Refeai 1986;Maher and Gray, 1990) The real shear behaviour of the FRS depends typically on the loading direction largely as a result of anisotropic fibre orientation. and coarse sand (Sadek, 2010) The failure envelope has two segments: a linear part associated with fibre pull out, and a nonlinear one related to yielding or breakage of the fibre material.…”

Section: ( )mentioning

confidence: 99%

See 1 more Smart Citation

Centrifuge modelling of the ground reaction curve of fibre reinforced soil

Cox¹

2013

ICPMG2014 – Physical Modelling in Geotechnics

View full text Add to dashboard Cite

The phenomenon known as the 'arching effect' occurs when a portion of granular mass yields relative to an adjacent stationary region. The movement is resisted by shearing stresses which act to reduce the pressure on the yielding support and increase the pressure on the adjacent stationary supporting zones.Arching is widely observed in both natural and man-made structures such as piled embankments, tunnelling, and above mine works and sinkholes.In this research the arching effect is recreated in the increased gravity environment of a geotechnical centrifuge where the pressure distribution across both the yielding and supporting soil masses is measured and the resulting soil displacements observed. A motor driven 'trapdoor' apparatus was built inside a plane strain container to model the yielding support. Both the trapdoor and an adjacent support were instrumented to measure the force (and derived pressure) distribution. Soil and trapdoor displacements are determined by analysis of digital images taken in-flight through a Perspex wall of the container.One method of increasing soil shear strength and its resistance to deformation is the reinforcement of soil with randomly distributed discrete fibres. The degree of improvement has been shown to be directly related to the fibre content in the soil, the fibre aspect ratio, orientation and mechanical properties.In this research the effect of fibre reinforcement on the arching process and resulting deformation is examined by variation of fibre parameters such as fibre aspect ratio and volumetric content of fibre. The influence of fibre and model scale effects were investigated by conducting a modelling of models exercise whereby trapdoor scale and effective stress were varied whilst maintaining a constant cover depth to structure width ratio, and compaction effort.The results were compared directly with those obtained for unreinforced soil trapdoor tests in order to determine the extent of improvement offered by fibrereinforcement.ii Intentionally blank page iii ACKNOWLEDGEMENTS

show abstract

Section: Fibre Reinforced Soil Displacements and Strainssupporting

confidence: 82%

Section: ( )mentioning

confidence: 99%

Centrifuge modelling of the ground reaction curve of fibre reinforced soil

Cox¹

2013

ICPMG2014 – Physical Modelling in Geotechnics

View full text Add to dashboard Cite

show abstract

“…Sadek et al [4] reported an experimental investigation for evaluating the shear strength of fiber reinforced sand. The addition of fibers with an aspect ratio ranging from 40 to 150 and fiber content ranging from 0.5 to 1.5 % was found to increase the shear strength and the ductility of sand-fiber composite.…”

Section: Introductionmentioning

confidence: 99%

Strength Characterization of Fiber Reinforced Cement–Fly Ash Mixes

Chore

Vaidya

2015

Int. J. of Geosynth. and Ground Eng.

View full text Add to dashboard Cite

The experimental investigation for the characterization of strength of fiber reinforced cement-fly ash mixes is presented in this paper. The objective of the investigation was to quantify the optimum quantity of cement contents and randomly distributed polypropylene fibers on the performance of cement stabilized and fiber reinforced fly ash mixes. Four samples of the mixes were considered in this investigation. For each sample, the fly ash was replaced by 5, 10, 15 and 20 % cement content, respectively. Similarly, the contents of the fibers were also varied by 0, 0.5, 1, and 1.5 %, respectively. The aspect of soaking was also considered. The samples were cured for 7, 14 and 28 days respectively. For the purpose of evaluation, unconfined compressive strength test and Brazilian (i.e., indirect) tensile strength test were conducted. The results obtained indicate significant improvement in strength with the inclusion of fibers and cement. The investigation underscores the effective utilization of pozzolanic waste such as fly ash as a civil engineering material.

show abstract

“…Among the various experimental means, direct shear tests have been widely employed to simulate the pullout failure of fibers/roots along a shear bandelike failure plane (Athanasopoulos 1996;Liu et al 2009;Sadek et al 2010). Meanwhile, being a proven way to explore soil behavior under a wide range of confining pressure, triaxial compression tests have been frequently used for the study of fiberreinforced soils (Gray and Al-Refeai 1986;Consoli et al 2007b).…”

Section: Introductionmentioning

confidence: 99%

Evaluation on Failure of Fiber-Reinforced Sand

Gao

Zhao

2013

J. Geotech. Geoenviron. Eng.

View full text Add to dashboard Cite

Fiber reinforcement can help to enhance soil strength, stabilize near-surface soil layers, and mitigate the risk of soil liquefaction. Evaluation of the strength of fiber-reinforced soils needs a proper failure criterion. This study presents a three-dimensional failure criterion for fiber-reinforced sand. By assuming that the total strength of the composite is a combination of the shear resistance of the host soil and the reinforcement of fibers, a general anisotropic failure criterion is proposed with special emphasis on the effect of isotropically/anisotropically distributed fibers. An anisotropic variable, defined by the joint invariant of the deviatoric stress tensor and a deviatoric fiber distribution tensor, is introduced in the criterion to quantify the fiber orientation with respect to the strain rate/stress direction at failure. With further consideration of the fiber concentration and other factors such as aspect ratio, the proposed criterion is applied to predicting the failure of fiber-reinforced sand in conventional triaxial compression/extension tests for both isotropically and anisotropically distributed fiber cases. The predictions are in good agreement with the test results available in the literature. The practical significance of using this criterion for such problems as inclined slope stabilization is briefly discussed.

show abstract

Shear Strength of Fiber-Reinforced Sands

Cited by 115 publications

References 27 publications

Centrifuge modelling of the ground reaction curve of fibre reinforced soil

Centrifuge modelling of the ground reaction curve of fibre reinforced soil

Strength Characterization of Fiber Reinforced Cement–Fly Ash Mixes

Evaluation on Failure of Fiber-Reinforced Sand

Contact Info

Product

Resources

About