Laboratory Investigation into the Effect of Fines Plasticity on the Mechanical Behavior of Sand/Fines Mixtures

Nougar, Benali; Brahimi, Abdelkader; Bouri, Djamel Eddine; Arab, Ahmed; Benessalah, Ismail

doi:10.1007/s40515-020-00144-5

Cited by 6 publications

(1 citation statement)

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“…[3,11,12] found that the add fines in the granular materials increases the cohesion and reduces the internal friction angle. For the silty samples sands, [13] depending on the increase in silt content, have found that the shear strength and the internal friction angle decrease, but the cohesion increases. But, for the silty-clayey sand samples, they found that the shear strength and the internal friction angle decrease until reaching minimum values of the fines content then increase beyond these fines contents while the cohesion increases and reduces.…”

Section: Introductionmentioning

confidence: 99%

Application of the hypoplastic model for validating direct shear tests to investigate the impact of fines on the behavior of chlef sand

Nougar,

Brahimi,

Bouri

et al. 2024

J. Eng. Exact Sci.

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This study was carried out to describe the mechanical behavior of different materials in terms of shear strength, cohesion and friction. For this purpose, an experimental shear tests were carried out. The soils used for the preparation of the samples were the Chlef sand, Chlef silt and M’zilla clay and a mixture composed of 50% of silt and 50% of clay. The soils were prepared by mixing Chlef sand with fines content of silt, clay or clay silt ranging from 0, 10, 20, 30 and 40%. The tests were conducted on sand samples prepared at a relative density of 20% representing a loose state and subjected to three normal stresses of 100, 200 and 400 kPa. All the tests were conducted at constant displacement rate of 1.00 mm/min. From the obtained results, it can be seen that the clean sand showed the highest shear strength at a small strains. At large strains, sands with 30% clay rather than 30% clay silt showed the highest shear strengths respectively. More contracted sands have the greatest increased maximum shear strengths. The sand with clayey silt, at a fine content of 20%, develops the most increased cohesion, among the other silty-clayey sands, together with the most reduced shear strength in elastic behavior. The sand with 40% of silt content develops a greater internal friction angle, however, the other silty sands, showed reduced shear strength, at the same behavior. To validate these findings, numerical simulations were performed on sand-silt mixtures using the hypoplastic model. The results indicated that the hypoplastic model accurately predicts the shear behavior of sand-silt mixtures in direct shear test, providing realistic insights into the effects of fines on the mechanical properties of the soil. Keywords: Sand, Silt, Clay, Fines Content, Shear Strength, Friction, Cohesion.

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