Effect of fiber-reinforcement on the mechanical behavior of sand approaching the critical state

Jakhongirbek Ganiev, Shotaro Yamada, Masaki Nakano, Takayuki Sakai

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Several types of ground improvement methods that employ fiber-reinforcement have been developed in recent years. A series of consolidated drained triaxial compression tests has been conducted here to examine the effect of short fibers on the mechanical properties of Toyoura sand. Sand with 0%, 0.2%, 0.4%, and 1% fiber contents, prepared to yield random distribution, was sheared under several confining pressures and controlled via their initial relative densities. The test results showed that the maximum and residual deviatoric stresses increased, whereas the volumetric expansion decreased with an increase in fiber content. Although the stress ratio η (=q/p′) and specific volume changed depending on the fiber content and confining pressure with shear progression, they each reached the same values for a definite fiber content at the end of shearing, independent of initial relative density. In other words, the unique critical state line can be found for a definite fiber content. Moreover, the greater the fiber content, the larger the slope of the critical state line at the end of shearing. Additionally, as the length of fibers shortened with the same percentage of fiber inclusions in sand, the deviatoric stress and the stress ratio decreased, approaching the shear-strain-volumetric response of unreinforced sand.

Original languageEnglish
Pages (from-to)1241-1252
Number of pages12
JournalJournal of Rock Mechanics and Geotechnical Engineering
Issue number4
Publication statusPublished - 2022 Aug


  • Critical state
  • Fiber-reinforced sand
  • Relative density
  • Stress ratio
  • Triaxial compression

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology


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