Effect of plastic fines on initial shear modulus of sand-clay mixtures

• Published in: KSCE journal of civil engineering 2018, 22(1), , pp.73-82
• Main Authors: Shivaprakash, B. G., Dinesh, S. V.
• Format: Article
• Language: English
• Subjects: Bentonite; Civil Engineering; Clay; Cotton; Earthquakes; Empirical equations; Engineering; Equivalence; Feasibility studies; Fine-grained soils; Fines; Geotechnical Engineering; Geotechnical Engineering & Applied Earth Sciences; Industrial Pollution Prevention; Laboratories; Mathematical models; Mixtures; Particle size; Plasticity; Plasticity index; Plastics; Rivers; Sand; Shear modulus; Shear strain; Shear tests; Soil; Soil mixtures; Soils; Triaxial tests; 토목공학
• ISSN: 1226-7988; 1976-3808
• DOI: 10.1007/s12205-017-1076-x

This paper presents the dynamic properties of sand-fines mixtures based on the results of undrained cyclic triaxial tests. The sand was obtained from Sabarmati River, and three types of fines F1 , F2 , and F3 were obtained from locally available fine grained soils i.e. Black cotton soil, Suddha soil, and Bentonite soil. Sand-fines mixtures of wide range of plasticity from non-plastic to highly plastic mixture with PI = 86 were prepared using the fines passing 75 μ size. The initial shear moduli of all sand-fines mixtures are evaluated in terms of fines content, Plasticity Index ( IP ) and equivalent plasticity index ( IP *) determined for soil passing 2 mm size IS Sieve. There is good correlation between the initial shear modulus of sand-fines mixtures and equivalent plasticity index ( IP *) compared to Plasticity Index ( IP ). An empirical equation for obtaining initial shear modulus is formulated based on equivalent plasticity index and mean-effective stress.