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原文传递 Determination of Field Suction Values, Hydraulic Properties, and Shear Strength in High PI Clays.

题名：	Determination of Field Suction Values, Hydraulic Properties, and Shear Strength in High PI Clays.
作者：	zornberg, j. g. kuhn, j. wright, s.
关键词：	shear strength, hydraulic conductivity, diffusion equations, soil strength, hydraulic properties, unsaturated properties, strength loss, earth structures
摘要：	Moisture infiltration into highway embankments constructed by the Texas Department of Transportation (TxDOT) using high Plasticity Index (PI) clays results in changes in shear strength and in flow pattern that leads to recurrent slope failures. In addition, soil cracking over time increases the rate of moisture infiltration. The overall objective of this research is to determine the suction, hydraulic properties, and shear strength of high PI Texas clays. Specifically, two comprehensive experimental programs involving the characterization of unsaturated properties and the shear strength of a high PI clay (Eagle Ford clay) were conducted. These laboratory results allow characterization of the decrease in shear strength with time induced by successive cycles of wetting and drying. Also, the experimental hydraulic results allow quantification of the changes in unsaturated hydraulic properties due to cracking. Assessment of the influence of critical precipitation events is provided. / NOTE: Technical rept. (Sept. 2004-Aug. 2006). / Supplementary Notes: See also PB2008-105087. 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.
总页数：	u0809；88p
报告类型：	科技报告