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Effect of suction hysteresis on resilient modulus of fine-grained cohesionless soil

OTCREOS7.1-27-F 1

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Okla State Agency	Transportation Center, Oklahoma
Okla Agency Code	'OKT'
Title	Effect of suction hysteresis on resilient modulus of fine-grained cohesionless soil
Authors	Khoury, Charbel N. Miller, Gerald A., Ph. D. Abousleiman, Younane N. University of Oklahoma. School of Civil Engineering and Environmental Science. Oklahoma Transportation Center.
Publisher	Oklahoma Transportation Center
Publication Date	2010-07
Publication type	Research Report/Study
Subject	Pavements--Subgrades. Moisture content. Modulus of resilience.
Purpose	The mechanical behavior of subgrade soil is influenced by the seasonal variations in moisture content. To better understand this behavior, it is crucial to study the relationship between soil moisture content and matric suction known as the Soil Water Characteristic Curve (SWCC). This relationship is hysteretic, i.e., at a given suction the moisture content differs depending on the drying and wetting paths. Research described in this report represents the beginning effort to understand the relationship of the SWCC to resilient modulus of subgrades. The behavior of the SWCC has been widely studied and various models have been developed to capture this hysteretic behavior, but limited experimental data are available under different applied stresses. The lack of SWCC experimental data is due to the long testing time required for unsaturated soils. A new procedure was developed to shorten equilibrium time and obtain SWCC data as fast as possible. This new approach was used and SWCC tests under different stress states on silty soil specimens under drying, wetting, secondary drying, and along scanning curves were performed. Results from this study helped improve and validate existing models briefly described in this report. The primary focus of this study was the effect of hydraulic hysteresis on the resilient modulus (Mr) of a cohesionless silty soil. Suction-controlled Mr tests were performed on compacted samples along the primary drying and wetting, secondary drying and wetting paths. A relationship between resilient modulus (Mr) and matric suction identified as the resilient modulus characteristic curve (MRCC) was developed. MRCC results indicated that Mr increased with suction along the drying curve. On the other hand, results of tests along the primary wetting curve indicated higher Mr than along the primary drying and the secondary drying curves. A new model to predict the MRCC results during drying and wetting (i.e., hydraulic hysteresis) is proposed based on the SWCC hysteresis. The model predicted favorably the drying and then the wetting results using the SWCC at all stress levels.
Notes	Final report; OTCREOS7.1-27-F
OkDocs Class#	Z2285.8 E27s 2010
Digital Format	PDF, Adobe Reader required
ODL electronic copy	Downloaded from agency website: http://www.oktc.org/otc/files/finalReports/OTCREOS7.1-27-F.pdf
Rights and Permissions	This Oklahoma state government publication is provided for educational purposes under U.S. copyright law. Other usage requires permission of copyright holders.
Language	English
Date created	2013-03-20
Date modified	2013-03-20

Title	OTCREOS7.1-27-F 1
Full text	Oklahooma Transportation Center Economic Enhancement through Infrastructure StewardshipOklahooma Transportation Center Economic Enhancement through Infrastructure Stewardship Oklahooma Transportation Center Economic Enhancement through Infrastructure Stewardship Oklahooma Transportation Center Economic Enhancement through Infrastructure Stewardship Oklahooma Transportation Center Economic Enhancement through Infrastructure StewardshipOklahooma Transportation Center Economic Enhancement through Infrastructure Stewardship Oklahooma Transportation Center Economic Enhancement through Infrastructure StewardshipOklahooma Transportation Center Economic Enhancement through Infrastructure Stewardship Oklahooma Transportation Center Economic Enhancement through Infrastructure Stewardship Oklahooma Transportation Center Economic Enhancement through Infrastructure Stewardship Oklahooma Transportation Center Economic Enhancement through Infrastructure Stewardship Oklahooma Transportation Center Economic Enhancement through Infrastructure Stewardship Oklahooma Transportation Center Economic Enhancement through Infrastructure Stewardship EFFECT OF SUCTION HYSTERESIS ON RESILIENT MODULUS OF FINE-GRAINED COHESIONLESS SOIL CHARBEL N. KHOURY,PH.D. GERALD A. MILLER, PH.D. YOUNANE N. ABOUSLEIMAN, PH.D. OTCREOS7.1-27-F Oklahoma Transportation Center 2601 Liberty Parkway, Suite 110 Midwest City, Oklahoma 73110 Phone: 405.732.6580 Fax: 405.732.6586 www.oktc.org
Date created	2013-03-20
Date modified	2013-03-20

Effect of suction hysteresis on resilient modulus of fine-grained cohesionless soil

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Effect of suction hysteresis on resilient modulus of...

Effect of suction hysteresis on resilient modulus of...