00228827

Component

http://onlinepubs.trb.org...s/hrr/1967/181/181-003.pdf

SOILS ADJACENT TO BRIDGE ABUTMENTS WILL BE EVALUATED. IT HAS BEEN OBSERVED THAT SOME CRACKS HAVE APPEARED PRECISELY IN THE JOINT BETWEEN BRIDGE ABUTMENTS AND THE PAVEMENT. ASSUMING THAT THIS TYPE OF FAILURE IS NOT DUE TO SETTLEMENT OF UNDERLYING SOILS BUT IS ATTRIBUTED TO A MICROSEISMIC VIBRATORY PHENOMENON CAUSED BY THE VEHICULAR TRAFFIC VIBRATION, AN EXPERIMENTAL STUDY WAS PERFORMED /1/ TO EVALUATE THE EFFECT OF SOIL PROPERTIES ON THE BEHAVIOR OF SOILS UNDER DYNAMIC LOADING, /2/ DETERMINE THE TYPE OF SOIL THAT WILL DEVELOP THE MINIMUM VOLUMETRIC CHANGE WHEN SUBJECTED TO VIBRATION, AND /3/ TO TRY TO CORRELATE THEIR PROPERTIES IN AN INDEX OF THE SUSCEPTIBILITY OF SOILS TO VOLUMETRIC CHANGES. FOR THE PURPOSE OF THIS STUDY THE INDEX IS CALLED VIBRATION INDEX. THIS INDEX WAS DETERMINED BY MEASURING THE VOLUMETRIC CHANGES WHICH OCCURRED WHEN A SOIL SAMPLE IN A COMPACTION MOLD WAS VIBRATED ON A VIBRATORY TABLE. A HIGH VIBRATION INDEX IS ASSOCIATED WITH LARGE VOLUMETRIC CHANGES. IMPACT TESTS WERE ALSO PERFORMED ON DIFFERENT SAMPLES PREPARED IN THE LABORATORY AND AN ENERGY INDEX WAS DETERMINED RELATING THE VOLUMETRIC CHANGE TO THE IMPACT ENERGY PER BLOW DURING THE TEST. AGAIN, A HIGH ENERGY INDEX IS INDICATIVE OF GREATER SUSCEPTIBILITY TO VOLUMETRIC CHANGES UNDER DYNAMIC LOADING. /AUTHOR/

Paper sponsored by Committee on Embankments and Earth Slopes and presented at the 46th Annual Meeting. 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.

01410131

English

pp 41-54

1967

Highway Research Record

Digital/other

Appendices (1) ; Figures (17) ; Photos (1) ; References (5) ; Tables (1)

Bridge abutments; Crash tests; Dynamic loads; Highway traffic; Laboratory tests; Properties of materials; Shock resistance; Soils; Vibration; Vibrometers; Volume changes

Impact strength; Soil properties

Geotechnology; Highways; Materials; Research

TRIS, TRB

Aug 15 2004 2:34AM

• DESIGN CHARTS FOR COEFFICIENTS OF ACTIVE EARTH PRESSURE OF COHESIONLESS SOILS-A RAPID METHOD
• STRESS DISTRIBUTION WITHIN AND UNDER LONG ELASTIC EMBANKMENTS
• UNUSUAL CASE OF EMBANKMENT FAILURE
• USE OF INSULATION TO UNIFORMLY RETARD FROST PENETRATION UNDER A HIGHWAY PAVEMENT