PREDICTION OF DRAINED STRENGTH OF SANDS FROM RELATIVE DENSITY MEASUREMENTS

THE PEAK STRENGTHS OF SAND IN SYMMETRIC STRAIN(FOR EXAMPLE, TRIAXIAL COMPRESSION) AND PLANE STRAIN CONVERGE AT VERY LOOSE DENSITIES TOWARDS THE COMMON ULTIMATE STRENGTH.BY DIVIDING THE PEAK STRENGTHS BY THE CONSTANT ULTIMATE STRENGTH, A SET OF DIMENSIONLESS CURVES IS OBTAINED WHICH REPRESENT THE EXTRA STRENGTH THAT CAN BE MOBILIZED IN SAND AT RELATIVE DENSITIES ABOVE ZERO.FOR THE RANGE OF ULTIMATE STRENGTHS NORMALLY ENCOUNTERED IN NATURAL SANDS (AVERAGE ULTIMATE STRENGTH EQUALS 28 TO 36 DEG), COMPUTATIONS SHOW THESE EXTRA STRENGTHS CAN BE REPRESENTED BY SINGLE CURVES OF DENSITY COMPONENTS (IN DEGREES), WHICH CAN BE ADDED TO THE ULTIMATE STRENGTH TO GIVE THE TOTAL DRAINED STRENGTH. THE ULTIMATE STRENGTH CAN BE RELIABLY ESTIMATED BY PERFORMING A STATIC ANGLE OF REPOSE TEST ON THE SAND.THE RECOMMENDED TECHNIQUES FOR MEASURING THE ANGLE OF REPOSE AND THE MAXIMUM/MINIMUM DENSITY OF SAND IN THE LABORATORY ARE DESCRIBED.THE METHOD OF PREDICTING STRENGTHS HAS BEEN COMPARED WITH ACTUAL STRENGTH TESTS PERFORMED ON SEVERAL SANDS OF DIVERSE ORIGINS,AND THE COMPARISONS GENERALLY AGREE TO WITHIN 1 DEG ON THE AVERAGE. FINALLY, TYPICAL COMPUTATIONS ARE PRESENTED TO AID THE PRACTICING ENGINEER IN THE USE OF THE METHOD. /AUTHOR/

  • Supplemental Notes:
    • Presented at the 75th Annual Meeting, Los Angeles, June 25-30, 1972.
  • Corporate Authors:

    American Society for Testing and Materials

    100 Barr Harbor Drive, P.O. Box C700
    West Conshohocken, PA  United States  19428-2957
  • Authors:
    • Cornforth, D H
  • Publication Date: 1973-7

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 281-303
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00080538
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper, A
  • Files: ITRD, TRIS
  • Created Date: Feb 27 1975 12:00AM