Shear Strength of Sands Reinforced with Polypropylene Fibers

Influence of randomly oriented fibres on shear strength of mineral soils

“…Results of the tests carried out byNoorzad and Zarinkolaei (2015) indicated that dispersed reinforcement increases the values of the angle of internal friction and cohesion (up to 8° and 19 kPa, respectively) in case of sand in loose state, which is in line with test results of loose and dense compacted sands obtained byDiambra et al (2010). On the other hand,Anagnostopoulus (2013) showed that in case of moderately compacted and compacted sand the influence of the reinforcement on shear strength is ambigu-Kąt tarcia wewnętrznegoAngle of internal friction, [°]Dodatek zbrojenia Addicitve of reinforcement[%] maximum value -polyolefine fibres residual value -polyolefine fibres maximum value -foil stripes residual value -foil stripes Relation between shear strength parameters of the medium sand and addition of the reinforcement at both moisture contents ous. In most cases the reinforcement slightly increased the values of the angle of internal friction (increase in range of 0.0÷2.7°) and increased or decreased the value of cohesion (from -2.3 to 3.3 kPa) Anagnostopoulus (2013).…”

“…On the other hand,Anagnostopoulus (2013) showed that in case of moderately compacted and compacted sand the influence of the reinforcement on shear strength is ambigu-Kąt tarcia wewnętrznegoAngle of internal friction, [°]Dodatek zbrojenia Addicitve of reinforcement[%] maximum value -polyolefine fibres residual value -polyolefine fibres maximum value -foil stripes residual value -foil stripes Relation between shear strength parameters of the medium sand and addition of the reinforcement at both moisture contents ous. In most cases the reinforcement slightly increased the values of the angle of internal friction (increase in range of 0.0÷2.7°) and increased or decreased the value of cohesion (from -2.3 to 3.3 kPa) Anagnostopoulus (2013). showed that regardless of compaction state the addition of the reinforcement increased shear strength of sand, especially in the range of large deformations.…”

A Laboratory Investigation on Shear Strength Behavior of Sandy Soil: Effect of Glass Fiber and Clinker Residue Content

“…Fiber-reinforced soil can be advantageously employed in improvement of the structural behavior of soils and the effectiveness of the reinforcement is influenced by the properties of the fiber, such as fiber type, volume fraction, length, aspect ratio, modulus of elasticity, and orientation and soil characteristics (particle size, shape, and gradation) and also stress level, density of soil and sample preparation methods. In the same context, Consoli et al [15], Anagnostopoulos et al [4], Benessalah et al [9], and Brahim et al [11] performed triaxial tests and direct shear tests on the reinforced sands with varying physical characteristics: grain size between 0.075 mm and 2 mm, uniformity coefficient 1.9 < C u < 4.13, relative density 20% < D r < 100%, and reinforced by different types of fibers (geotextiles, nylon, polyester, polypropylene, glass fibers). They found that the addition of fibers increases the shear strength and the residual strength while the rigidity modulus did not seem affected by the inclusion of fibers.…”

The Performance of a Sand Reinforced with Coconut Fibers Through Plate Load Tests on a True Scale Physical Model

“…The fiber average dimensions were 50 mm in length and the content used was 0.5% by dry weight of soil. Previous studies have demonstrated that a fiber content of 0.5% is an upper limit considering workability and homogeneity (Consoli et al, 2003a;Consoli et al, 2009b;Consoli et al, 2007a;Anagnostopoulos et al, 2013).…”