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Title: PONDING AN EXPANSIVE CLAY CUT: EVALUATIONS AND ZONES OF ACTIVITY
Accession Number: 00177120
Record Type: Component
Availability: Find a library where document is available Abstract: The use of ponding water on a clay subgrade of high swelling potential to cause soil heaves before pavement was successful on an expressway project outside San Antonio, Texas. Expansive soils are a worldwide problem and cause over $2 billion damages/year in the United States. Their effectiveness of controlling the clay was measured, and the depth of the movements was determined. Observations began in 1968 and continued through 1976, both inside and outside the ponded area. The elevation rods were set at depths of 0.6 to 5.8 m (2 to 19 ft), and the moisture measurements were taken in the same zones. The ponding generally resulted in an upward movement of the elevation rods. The maximum movement was that of the shallower set rods in all areas. It now exceeds 0.12 m (0.42 ft) in the area where the predicted vertical rise is 0.15 m (0.5 ft). The moisture variations were greatest at depths up to 3 m (10 ft), where the rods exhibited maximum movement. This was the zone of activity. Pavements in the ponded ares have shown less distress and less major cracking and have required less major maintenance work than those in the nonponded areas. The relation of rainfall measurements to rod movements is not definiteve. A trend may be developing that shows upward movement to follow rainfall after prolonged dry periods. Ponding does seem to help curb the destructive movements of expansive clays.
Supplemental Notes: Publication of this paper sponsored by Committee on Lime and Lime-Fly Ash Stabilization. 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: Monograph Accession #: 01411485
Authors: Steinberg, Malcolm LPagination: pp 61-66
Publication Date: 1977
Serial: ISBN: 0309026709
Media Type: Print
Features: Figures
(8)
; References
(9)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology; Pavements
Files: TRIS, TRB
Created Date: Jun 28 1978 12:00AM
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