LIQUEFACTION BEHAVIOR OF SAND-GRAVEL COMPOSITES

This paper describes a series of undrained cyclic triaxial tests to quantify the effect of gravel content on the liquefaction resistance of sand-gravel composites. Specimens with gravel contents of 0, 20, 40, 60, and 100 percent were tested. Test results indicate that increasing the gravel content may increase significantly the liquefaction resistance of sand-gravel composites. This increase was observed even for composite specimens tested at the same relative density. Investigators found that at 40 percent gravel content, a 40 percent relative density composite with 40 percent gravel will behave similar to a 65 percent relative density sand for the soils tested in this study. A method is proposed to estimate the cyclic strength of the composite soil by testing the finer fraction soil alone. Underestimated prototype cyclic strength may be the result of scalping oversized particles from gap-graded soils when the scalped soil is tested at the same relative density as either the total composite or the finer fraction of the composite. For less dense specimens, a better estimate of the prototype cyclic strength may be obtained by testing the fine material at an equivalent relative density. An equivalent density of the finer fraction is proposed to account for the effect of gravel inclusions on the liquefaction behavior of the composite.

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 287-298
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00675508
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 12 1995 12:00AM