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Title: EFFECTS OF COMPACTOR FOOTPRINTS ON THE RESPONSE OF SUBGRADE SOIL
Accession Number: 00641438
Record Type: Component
Availability: Find a library where document is available Abstract: The influence of compactor footprints on the constitutive response of clayey sand subgrade soil was investigated. Three footprint types--flat base, cylindrical protrusion, and pyramid frustum protrusion--were examined using triaxial tests and pavement model tests under dynamic loading. First, each block sample was prepared using the compactor of certain footprint. The triaxial specimens were trimmed from the block sample at different orientations to represent the rotation of the principal stress direction. The results show significant variations in the responses. Samples compacted by the compactor with pyramid frustum protrusion base showed the highest lateral stiffness, followed by samples compacted with cylindrical protrusion, and finally those compacted with the smooth footprint. However, samples compacted with the flat base showed the stiffest response in the vertical direction. The subgrades of the pavement models were each compacted to the same density using compactors with different footprints. A dynamic load of 448 kPa was applied on the pavement model through a plate. Linear voltage displacement transformers and photographic techniques measured the deformation of the soil elements within the subgrade. The results show that, although the subgrade of the models were of the same density, the monitored displacements of elements within each pavement system were significantly influenced by the footprint type used during compaction. Traces of the displaced points show a significant variation of the deflection curve at the interlayer, which reflects rutting.
Supplemental Notes: This paper appears in Transportation Research Record No. 1406, Construction Robotics and Automation, and Foundations Engineering. 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
Monograph Title: Construction robotics and automation, and foundations engineering Monograph Accession #: 01403255
Language: English
Authors: Budiman, JeffWibowo, JohanesPagination: p. 58-67
Publication Date: 1993
Serial: ISBN: 0309055539
Features: Figures
(13)
; Photos
(3)
; References
(11)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Geotechnology; Highways; I42: Soil Mechanics
Files: TRIS, TRB, ATRI
Created Date: Jan 25 1994 12:00AM
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