LARGE AMPLITUDE VIBRATION EFFECTS ON THE SHEAR MODULUS OF SAND

THE EFFECT OF LARGE AMPLITUDE STEADY-STATE VIBRATIONS ON THE SHEAR MODULUS OF SANDS IS CONSIDERED. THE TORSIONAL RESONANT COLUMN METHOD WAS EMPLOYED FOR THIS RESEARCH USING TWO SPECIALLY CONSTRUCTED DEVICES. ONE DEVICE TORSIONALLY OSCILLATES A 4 CM DIAMETER, 27 CM LONG SOLID CYLINDRICAL SPECIMEN WHILE THE SECOND DEVICE TESTS A HOLLOW CYLINDER OF SAND HAVING A 4 CM INSIDE DIAMETER, A 6 CM OUTSIDE DIAMETER, AND A 30 CM LENGTH. THE HOLLOW CYLINDER WAS USED TO OBTAIN A MORE UNIFORM SHEAR STRAIN THROUGHOUT THE SAMPLE. THE TWO TESTING PROGRAMS DETERMINED THE SHEAR MODULUS OF C-190 OTTAWA SAND AS A FUNCTION OF VOID RATIO AND CONFINING PRESSURE BEFORE AND AFTER LARGE AMPLITUDE TORSIONAL VIBRATION HAD BEEN APPLIED. THE EFFECT OF LARGE AMPLITUDE VIBRATION WAS THE INCREASE OF LOW AMPLITUDE SHEAR MODULUS BY AS MUCH AS 100 PER CENT. THE INCREASE COULD NOT BE ACCOUNTED FOR ON THE BASIS OF VOID RATIO CHANGE. VIBRATION AMPLITUDE (SHEAR STRAIN AMPLITUDE IN THE HOLLOW SPECIMEN) AND CYCLES OF TORSIONAL VIBRATION ARE CONSIDERED IN PRESENTING THE DATA. THE INCREASE IN LOW AMPLITUDE SHEAR MODULUS WAS ACCOMPANIED BY AN INCREASE IN DAMPING INDICATING A CHANGE IN THE MECHANICAL CHARACTERISTICS OF THE SAMPLE CAUSED BY THE DIFFERENT PATTERNS OF VIBRATION HISTORY. /AUTHOR/

  • Supplemental Notes:
    • Report No 3-161, 78 PP, 40 FIG, 3 TAB, 3 REF, 1 APP
  • Corporate Authors:

    University of Michigan, Ann Arbor

    Ann Arbor, MI  United States  48109
  • Authors:
    • Drnevich, V P
    • HALL, J R
    • Richart, F E
  • Publication Date: 1966-10

Subject/Index Terms

Filing Info

  • Accession Number: 00234280
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 13 1994 12:00AM