SUBGRADE STRESS AND DEFORMATION UNDER DYNAMIC LOAD-CLOSURE

EHRLER'S RESULTS INDICATE THE SAME TYPE OF RELATIONSHIP BETWEEN MODULUS OF ELASTICITY AND STRESS LEVEL AS THE RESULTS PRESENTED BY THE AUTHORS. EHRLER'S RESULTS WERE OBTAINED FROM VIBRATION TESTING OF SOIL. LOADING USED BY THE AUTHORS WAS NOT VIBRATORY, IT CONSISTED OF A SINGLE LOAD PULSE ANALOGOUS TO THAT OBTAINED IN A SOIL AS A RESULT OF A VEHICLE WHEEL PASSING OVER THE SURFACE. EHRLER'S COMMENTS ABOUT THE OPPOSITE STRESS DEPENDENCE OF MODULUS UNDER STATIC AND UNDER DYNAMIC CONDITIONS REQUIRE CLARIFICATION. HUANG HAS POINTED OUT THAT THE MODULUS OF ELASTICITY DEPENDS UPON BOTH CONFINING STRESS (OR FIRST STRESS INVARIANT IN THE SOIL MASS) AND DEVIATOR STRESS (OR SECOND DEVIATOR STRESS INVARIANT IN THE SOIL MASS). IF THE SYSTEM TESTED BY THE AUTHORS BEHAVES IN THIS WAY, THE RESULTS INDICATE THAT MODULUS IS BEING AFFECTED FAR MORE BY DEVIATOR STRESS THAN BY CONFINING STRESS. IT IS NOT APPARENT AT PRESENT WHETHER THIS IS A DYNAMIC EFFECT OR WHETHER THE SOIL IS BEHAVING IN THE SAME WAY AS STATIC TESTS INDICATE. IT IS INDICATED THAT TESTS UNDER STATIC AND DYNAMIC CONDITIONS ON SOIL SPECIMENS WOULD RESOLVE THIS POINT. REFERENCES: JOURNAL OF THE SOIL MECHANICS AND FOUNDATIONS DIVISION, PROCEEDINGS OF THE AMERICAN SOCIETY OF CIVIL ENGINEERS, S.F. BROWN AND P.S. PELL, PROC. PAPER NO. 5057, JANUARY 1967

  • Supplemental Notes:
    • Vol 94, No SM 4, PP 1039-1040, 1 REF
  • Authors:
    • BROWN, S F
    • Pell, P S
  • Publication Date: 1968-7

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  • Accession Number: 00235327
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 16 1994 12:00AM