Aubeny and Lytton 2003 (2) - 1 Report No 2 Government...

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Technical Report Documentation Page 1. Report No. FHWA/TX-03/2100-P1 2. Government Accession No. 3. Recipient's Catalog No. 4. Title and Subtitle ESTIMATING STRENGTH VERSUS LOCATION AND TIME IN HIGH-PLASTICITY CLAYS 5. Report Date February 2003 6. Performing Organization Code 7. Author(s) Charles Aubeny and Robert Lytton 8. Performing Organization Report No. Product 2100-P1 10. Work Unit No. (TRAIS) 9. Performing Organization Name and Address Texas Transportation Institute The Texas A&M University System College Station, Texas 77843-3135 11. Contract or Grant No. Project No. 0-2100 13. Type of Report and Period Covered Manual: September 2000-December 2002 12. Sponsoring Agency Name and Address Texas Department of Transportation Research and Technology Implementation Office P. O. Box 5080 Austin, Texas 78763-5080 14. Sponsoring Agency Code 15. Supplementary Notes Research performed in cooperation with the Texas Department of Transportation and the U.S. Department of Transportation, Federal Highway Administration Research Project Title: Long-Term Strength Properties of High PI Clays Used in Embankment Construction 16. Abstract Suction strongly influences the soil strength in slopes and earth structures constructed of high- plasticity clays. Strength degradation in earth structures can be explained in terms of moisture infiltrating into the soil mass, which reduces the suction and therefore strength of the soil. A moisture diffusion coefficient controls the rate of moisture diffusion into a soil mass. Changes in suction during the life of a structure can be predicted from analytical and numerical solutions of the diffusion equation. This manual provides guidelines for predicting soil strength from estimated values of suction, estimating the moisture diffusion coefficient, and predicting suction as a function of location and time based on the estimated moisture diffusion coefficient. From these three steps, soil strength can be estimated as a function of location and time in slopes and earth structures. 17. Key Words Clays, Slopes, Moisture Diffusion, Cracking, Earth Structures 18. Distribution Statement No restrictions. This document is available to the public through NTIS: National Technical Information Service 5285 Port Royal Road Springfield, Virginia 22161 19. Security Classif.(of this report) Unclassified 20. Security Classif.(of this page) Unclassified 21. No. of Pages 60 22. Price Form DOT F 1700.7 (8-72) Reproduction of completed page authoriz
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ESTIMATING STRENGTH VERSUS LOCATION AND TIME IN HIGH-PLASTICITY CLAYS by Charles Aubeny Assistant Professor Texas A&M University and Robert Lytton Professor Texas A&M University Product 2100-P1 Project Number 0-2100 Research Project Title: Long-Term Strength Properties of High PI Clays Used in Embankment Construction Sponsored by the Texas Department of Transportation In Cooperation with the U.S. Department of Transportation Federal Highway Administration February 2003 TEXAS TRANSPORTATION INSTITUTE The Texas A&M University System College Station, Texas 77843-3135
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