摘要: |
A study was conducted to determine field suction values as well as the effect of cracking on the hydraulic properties of compacted highly plastic clays. This investigation consisted of an experimental program involving a series of instrumented soil column tests on highly plastic clay prepared under controlled compaction conditions and subjected to evaporation, infiltration, and a second evaporation stage. During both evaporation and infiltration stages, water content and suction profiles were measured. Analysis was conducted using the results of the experimental program to determine the effect of cracking on the hydraulic properties of the soil. This analysis indicates that cracking has a significant effect on the soil-water retention curve and the hydraulic conductivity of the compacted highly plastic clay under unsaturated conditions. The results of this analysis allow determination of field suction values and depth of moisture fluctuation. This study is complimented with slope stability analyses, evaluation of the recurrence rate of failures, and an overview of site visits conducted in this study. / NOTE: Technical rept. (2004-2006). / Supplementary Notes: See also PB2008-105088. Sponsored by Texas Dept. of Transportation, Austin. Research and Technology Implementation Office. and Federal Highway Administration, Austin, TX. Texas Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |