Influence of fines content and type on the small-strain shear modulus of sand

Paydar, N. A ; Sharif University of Technology

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  1. Type of Document: Article
  2. Abstract:
  3. The small-strain shear modulus, Go, is an important fundamental soil property. Although many studies have been conducted on this property for clean sands and pure clays, small-strain behavior for mixtures of sand and fines has been less addressed. This paper presents the results of a comprehensive laboratory study on G0 value of sand containing various amounts of different fines. To this aim, bender elements were integrated into a conventional triaxial apparatus, and shear wave velocity was measured on samples of sand with different amounts of highly-plastic, medium-plastic, low-plastic, or non-plastic fines at different void ratios. Measuring the shear wave velocity and thus obtaining Go at different void ratios and effective stresses, the intrinsic parameters that characterize Go were determined for the tested materials. This allowed the effects of fines type and content on the Go value of sand to be evaluated in a systematic manner. The Go values of different sand-fines mixtures were compared based on different density parameters. Results show that Go of silty and clayey sands is affected by both fines content and fines type. Therefore, in order to estimate Go of sand-fines mixture, not only the fines content but also their plasticity needs to be properly accounted
  4. Keywords:
  5. Fines content ; Plastic fines ; Acoustic wave velocity ; Elastic moduli ; Mixtures ; Sand ; Shear strain ; Shear waves ; Wave propagation ; Different densities ; Intrinsic parameters ; Laboratory studies ; Non-plastic fines ; Shear wave velocity ; Small-strain shear modulus ; Triaxial apparatus ; Shear flow
  6. Source: Scientia Iranica ; Vol. 21, issue. 4 , 2014 , p. 1281-1296
  7. URL: http://www.medsci.cn/scI/show_paper.asp?id=d72d9150740