Journal of Korean Society of Agricultural Engineers ISSN:1738-3692(Print) 2093-7709(Online) 한국농공학회논문집

A series of resonant column test was performed to investigate the dynamic deformation characteristics of silty sand soils mixed with polypropylene fibrillated type fiber.Results show that optimum mixing ratios were 0.2% for 19mm of cut fiber for shear modulus and 0.1% for 60mm cut fiber fur damping ratio.As shear strain was increased, normalized values of shear modulus (G(Reinforced)/ G(Unreinforced)) of fiber reinforced soil were increased up to 10^-3%~10^-1% ranges. However, normalized damping ratio (D(Reinforced/D(Unreinforced)) was diminished with an increase in strain beyond 10^-3%~10^-1% for the damping capacity of soils mixed with fiber. Normalized shear modulus (G/G_max) obtained from the test was plotted in the chart suggested by Seed and Idriss. The shear modulus of silty sand was located between sand and gravel curves.