The quantity of granular material in a residual clay was varied to determine the effect on strength parameters as determined by triaxial test procuderes. Consolidation and permeability characteristics were studied, and general conclusions were drawn on the relationship of granular content to permeability and pore pressure development in embankment construction. With less than 40 percent retained on the No. 10 sieve, the study soil was indicated by triaxial tests to have an effective angle of internal friction averaging 32 degrees. The average effective angle increased to a maximum of 34 degrees with 50 percent granular content, the maximum tested. Total strength parameters show a large increase in apparent cohesion at granular contents exceeding 40 percent. Test data indicate the study soil to be highly impermeable at granular contents of over 40 percent, the permeability increases fifty fold. Triaxial testing provides more realistic strength parameters than were previously determined by direct shear testing for this soil. Within the ranges tested, no significant differences in effective strength parameters were found as a result of varying triaxial specimen sizes or the top size of the included granular material.

  • Supplemental Notes:
    • Prepared in cooperation with FHWA.
  • Corporate Authors:

    EKVOMissouri State Highway Department

  • Publication Date: 1976-3

Media Info

  • Features: Figures; Tables;
  • Pagination: 55 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00141257
  • Record Type: Publication
  • Report/Paper Numbers: Study 75-1 Final Rpt.
  • Files: TRIS
  • Created Date: Oct 26 1976 12:00AM