LONG-TERM PRESSURE EFFECTS ON SHEAR MODULUS OF SOILS

LONG-TERM RESONANT-COLUMN TESTS WERE PERFORMED ON SEVEN AIR-DRY SOILS TO DETERMINE THEIR SMALL-STRAIN DYNAMIC BEHAVIOR UNDER CONFNING PRESSURES MAINTAINED FOR DURATIONS UP TO 803 DAYS. TEST RESULTS INDICATE THAT: THE SHEAR MODULUS OF AIR-DRY SOILS AT CONSTANT CONFINING PRESSURE INCREASES WITH TIME; THE SHEAR MODULUS AFTER 2 YR CAN BE PREDICTED WITHIN 15% FROM 2- DAY TESTS; THE TIME-DEPENDENT INCREASE IN MODULUS INCREASES WITH DECREASING PARTICLE SIZE; THE TIME- DEPENDENT INCREASE IN DENSITY UNDER A CONSTANT PRESSURE ACCOUNTS FOR ONLY 0%-15% OF THE TOTAL TIME-DEPENDENT MODULUS INCREASE; CONTINUOUS LOW AMPLITUDE VIBRATION (SHEARING STRAIN LESS THAN 0.00001) HAS NO MEASURABLE EFFECT ON THE SOILS TESTED OVER AND ABOVE THE TIME- DEPENDENT MODULUS INCREASE; AND A 10-PSI STEP INCREASE IN PRESSURE MAY DESTROY UP TO 15% OF THE TIME- DEPENDENT MODULUS ACCUMULATED WITH TIME IN CLAY, BUT DOES NOT INFLUENCE SAND OR SILT. /AUTHOR/

  • Supplemental Notes:
    • Vol 97, No SM10, PROC PAPER 8475, PP 1445-1460
  • Authors:
    • Afifi, S S
    • Woods, R D
  • Publication Date: 1971-10

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Filing Info

  • Accession Number: 00236271
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 15 1972 12:00AM