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Title:

INVESTIGATION OF MOISTURE-INDUCED VARIATION IN SUBGRADE MODULUS BY CROSS-CORRELATION METHOD

Accession Number:

00389566

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309036666

Abstract:

The change in moisture content of subgrade soils and its resultant effects on structural pavement performance are of interest to many highway engineers. One of the primary sources of moisture in thee subgrade is water from precipitation. The purpose of this research was to examine the feasibility of statistically relating the variation in subgrade modulus with the corresponding time history of precipitation. Two locations on KS-4 in northeast Kansas were monitored from March through November. Dynamic pavement surface deflections were obtained each week by Dynaflect, and time histories of subgrade moduli were constructed from normalized Dynaflect deflection parameters. A corresponding time history of precipitation at the locations was obtained from the local U.S. Weather Bureau station. A cross-correlation study by computer of the two times series revealed a statistically significant correlation between precipitation history and variation in subgrade modulus. the time required for the subgrade to reach its weakest state after a rainfall was found to be rather long--up to 3 weeks might be required. The interrelationship of other factors, such as runoff characteristics and temperature, that might influence this time delay, was not considered in this study. (Author)

Supplemental Notes:

Publication of this paper sponsored by Committee on Environmental Factors Except Frost. 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 Accession #:

01420444

Authors:

Bandyopadhyay, S S
Frantzen, J A

Editors:

Kaplan, Elizabeth W

Pagination:

pp 10-15

Publication Date:

1983

Serial:

Transportation Research Record

Issue Number: 945
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309036666

Media Type:

Print

Features:

Figures (8) ; References (21) ; Tables (1)

Old TRIS Terms:

Subject Areas:

Data and Information Technology; Geotechnology; Highways; Hydraulics and Hydrology; Pavements; I42: Soil Mechanics

Files:

TRIS, TRB

Created Date:

Oct 30 1984 12:00AM

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