ABSTRACT
A series of undrained triaxial experiments for compression and extension were conducted on unreinforced and fiber-reinforced. Three fiber contents of 0.0, 0.2, and 0.4% by dry weight of host soil have been utilized to investigate the trend of fiber-reinforcement. The samples were prepared in medium loose condition with approximately 40% relative density to fully reveal the effect of fibers on pore water pressure generation in a range of 20% axial strain. Experimental results showed that the fibers were more effective in compression compared to extension at a higher axial strains. However, a smaller initial stiffness in compression was observed with the increase in fiber content. A possible mechanism for such kind of behavior were proposed through the consideration of the interaction mechanism between fibers and sand particles, and the influence of fibers on the initial anisotropy of sandy soil.
