EFFECT OF VIBRATIONS ON THE BEARING PROPERTIES OF SOILS

THE EFFECT OF VIBRATIONS ON AIRPORT PAVEMENT PERFORMANCE IS STUDIED. THE FINDINGS ARE EXPLAINED BY WHICH IT WAS DEMONSTRATED THAT CONTROLLED STRAIN LOAD TESTS OR CBR TESTS CANNOT BE APPLIED TO THE STUDY OF VIBRATION EFFECTS. THE RESULTS OF A COMPLETED SERIES OF SMALL-SCALE CONTROLLED STRESS 2-IN AND 5-IN DIAMETER PLUNGER TESTS ON A WELL GRADED SAND ARE REPORTED. THESE TESTS WERE PERFORMED AT FREQUENCIES BELOW THE ESTABLISHED RESONANCE RANGE OF THE VIBRATING SYSTEMS. DIAGRAMS ARE GIVEN SHOWING THE RELATIONSHIP BETWEEN OBSERVED PLUNGER PENETRATIONS AND THE TIME OF VIBRATION; ALSO THE RELATIONSHIP BETWEEN THE RELATIVE DENSITY, THE SATURATION CONDITIONS OF THE SAND, AND THE OBSERVED PLUNGER PENETRATIONS UNDER STATIC AND DYNAMIC LOADING. COMPARISONS ARE MADE BETWEEN THE OBSERVED EFFECTS OF A DYNAMIC VIBRATORY FORCE AND AN EQUIVALENT STATIC FORCE SHOWING THE GREATER RELATIVE MAGNITUDE OF THE FORMER. FOR EQUAL DENSITIES AND BOTH STATIC AND DYNAMIC PLUNGER PENETRATIONS THE GREATEST WERE RECORDED FOR SUBMERGED SAND AND THE SMALLEST FOR DRY SAND, WITH SAND SATURATED BY CAPILLARITY GIVING INTERMEDIATE VALUES. A TENTATIVE HYPOTHESES IS ADVANCED GIVING AN EXPLANATION OF THE OBSERVED LIMITATION OF THE CONVENTIONAL ASSUMPTIONS CONCERNING THE ACTION OF INCREASED EFFECTIVE STRESSES DUE TO CAPILLARY SATURATION OF SAND. THE RESULTS OF THE FIRST SET OF VIBRATORY PLUNGER TESTS ON ONE TYPE OF SILTY CLAY ARE REPORTED. /AUTHOR/

• Supplemental Notes:
  • Vol 24, pp 404-425, 28 FIG, 4 TAB, 9 REF. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Tschebotarioff, G P
  • Palmer, L A
• Publication Date: 1945

Media Info

• Monograph Title: Proceedings of the Twenty-Fourth Annual Meeting of the Highway Research Board (Unassembled)
• Serial:
  • Highway Research Board Proceedings
  • Volume: 24
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Bearing capacity; Capillarity; Dynamic loads; Effective stress; Percent saturation; Sand; Soils; Specific gravity; Static loads; Vibration
• Old TRIS Terms: Plungers; Soil bearing capacity; Stress control
• Subject Areas: Geotechnology; Highways; Pavements;

Filing Info

• Accession Number: 00207294
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Sep 13 1971 12:00AM