Geomechanics and Engineering

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Shear wave velocity of fiber reinforced cemented Toyoura silty sand

  • Safdar, Muhammad (Earthquake Engineering Center, Department of Civil Engineering, University of Engineering and Technology) ;
  • Newson, Tim (Department of Civil and Environmental Engineering, Western University) ;
  • Schmidt, Colin (Thurber Engineering Ltd.) ;
  • Sato, Kenichi (Department of Civil Engineering, Fukuoka University) ;
  • Fujikawa, Takuro (Department of Civil Engineering, Fukuoka University) ;
  • Shah, Faheem (Earthquake Engineering Center, Department of Civil Engineering, University of Engineering and Technology)
  • Received : 2020.11.27
  • Accepted : 2021.04.19
  • Published : 2021.05.10
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Abstract

Several additives are used to enhance the geotechnical properties (e.g., shear wave velocity, shear modulus) of soils to provide sustainable, economical and eco-friendly solutions in geotechnical and geo-environmental engineering. In this study, piezoelectric ring actuators are used to measure the shear wave velocity of unreinforced, fiber, cemented, and fiber reinforced cemented Toyoura sand. One dimensional oedometer tests are performed on medium dense specimens of Toyoura sand-cement-fiber-silica flour mixtures with different percentages of silica flour (0-42%), fiber and cement (e.g., 0-3%) additives. The experimental results indicate that behavior of the mixtures is significantly affected by the concentration of silica flour, fiber and cement additives. Results show that with the addition of 1-3% of PVA fibers, the shear wave velocity increases by only 1-3%. However, the addition of 1-4% of cement increases the shear wave velocity by 8-35%. 10.5-21% increase of silica flour reduces the shear wave velocity by 2-5% but adding 28-42% silica flour significantly reduces the shear wave velocity by 12-31%. In addition, the combined effect of cement and fibers was also found and with only 2% cement and 1% fiber, the shear wave velocity increase was found to be approximately 24% and with only 3% cement and 3% fibers this increased to 35%. The results from this study for the normalized shear modulus and normalized mean effective stress agree well with previous findings on pure Toyoura sand, Toyoura silty sand, fiber reinforced, fiber reinforced cemented Toyoura sand. Any variations are likely due to the difference in stress history (i.e., isotropic versus anisotropic consolidation) and the measurement method. In addition, these small discrepancies could be attributed to several other factors. The potential factors include the difference in specimen sizes, test devices, methods of analysis for the measurement of arrival time, the use of an appropriate Ko to convert the vertical stresses into mean effective stress, and sample preparation techniques. Lastly, it was investigated that there is a robust inverse relationship between α factor and 𝞫0 exponent. It was found that less compressible soils exhibit higher 𝜶 factors and lower 𝞫0 exponents.

Keywords

Acknowledgement

The research project was financially supported by the Western Graduate Research Scholarship at the Department of Civil and Environmental Engineering, Western University, London, Ontario, Canada. The authors would also like to acknowledge the Department of Civil Engineering, Fukuoka University, Fukuoka, Japan for providing Toyoura Sand for the current research project.

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