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Title:

SOIL-WATER POTENTIAL AND RESILIENT BEHAVIOR OF SUBGRADE SOILS

Accession Number:

00301590

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

The special significance water has for pavement systems is that such structures are generally associated with soils close to ground surface, are subject to large moisture content variations, and are strongly influenced by environmental conditions. The object of this study is to establish experimentally the relationship between the strength and deformation characteristics under highway loading conditions and the soil moisture regime in terms of the soil-water potential (or soil suction). To do this, laboratory specimens of a mixture of a typical Wisconsin subgrade soil and 25 percent sand were compacted at optimum and plus or minus 2 percent of optimum moisture content. These were subsequently equilibrated to a range of suction values up to 1500 kPa (217.4 lbf/sq in) in a soil moisture extractor. The specimens were subjected to a repetitive uniaxial compression loading of 80 kPa (11.6 lbf/sq in) at a frequency of 0.5 cycle/s up to 10,000 loading repetitions. After the computed values of resilient modulus and residual strain were studied as a function of the moisture parameters, it was concluded that soil suction is the fundamental parameter in characterizing the moisture state and its effects on the mechanical behavior of soils. For the silt loam soils (low-plasticity clays) considered, compaction at dry-op-optimum moisture content results in subgrades more susceptible to moisture changes. There appear to be significant advantages in taking suction-related improvements in the mechanical properties into account if the regional climatic conditions are to ensure a suitable range of moisture index. However, there seems to be a limit to the increases in resilient modulus with increasing soil suction because the resilient moduli decrease for suction values greater than a critical value. /Authors/

Supplemental Notes:

Publication of this paper sponsored by Committee on Subsurface Drainage and 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 #:

01411055

Authors:

Edil, Tuncer B
Motan, Sabri E

Pagination:

pp 54-63

Publication Date:

1979

Serial:

Transportation Research Record

Issue Number: 705
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

58th Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia, United States
Date: 1979-1-15 to 1979-1-19

Media Type:

Print

Features:

Figures (8) ; References

Old TRIS Terms:

Subject Areas:

Freight Transportation; Geotechnology; Highways

Files:

TRIS, TRB

Created Date:

Dec 19 1979 12:00AM

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