Interpretation of In Situ Tests as Affected by Soil Suction

Collins, Rodney W.; Miller, Gerald A.; University of Oklahoma. School of Civil Engineering and Environmental Science

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Interpretation of In Situ Tests as Affected by Soil Suction

2013-07-01
By Collins, Rodney W. ; Miller, Gerald A.

[PDF-2.31 MB]

English

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Creators:

Collins, Rodney W. ; Miller, Gerald A.

Collins, Rodney W. ; Miller, Gerald A. Less -
Corporate Creators:

University of Oklahoma. School of Civil Engineering and Environmental Science
Corporate Contributors:

United States. Dept. of Transportation. Research and Innovative Technology Administration
Subject/TRT Terms:

[+]

Cone Penetrometers Field Tests Moisture Content Research Hub Soil Penetration Test Soil Suction Unsaturated Soils Weather Conditions
Publication/ Report Number:

OTCREOS11.1-45-F
Resource Type:

Tech Report
Geographical Coverage:

Oklahoma ; United States

Oklahoma ; United States Less -
Corporate Publisher:

Oklahoma Transportation Center
Abstract:

Soil moisture conditions are subject to change depending on the season in which they are tested. In unsaturated soils the moisture at which a soil is tested can directly affect strength and stiffness of the material. In situ testing is commonly used for geotechnical investigations; however, the analysis methods assume the soil is either completely dry or saturated. For near surface soils, these conditions are often the exception to the rule rather than the standard. Currently there are no well established methods for interpretation of in situ tests in unsaturated soils. Research is being conducted to investigate the influence of changing moisture conditions on the response of in situ tests in unsaturated soil. Two sites were instrumented with weather monitoring stations and moisture sensors were placed at depths of 1, 3 and 6 feet. At two month intervals a suite of in situ tests including; cone penetration (CPT), standard penetration (SPT), and pre-bored pressure meter (PMT), are performed. In addition, in situ tension meters have been installed at one site and samples are obtained for water content and suction measurements when in situ tests are conducted. Other laboratory tests are being conducted on undisturbed samples to establish baseline saturated and unsaturated soil properties as well as soil water characteristic curves. This report will present results of field tests demonstrating the importance of moisture content and matric suction on the in situ test results. The ultimate goal of the research is to better predict changes in soil moisture based on weather data and develop a framework to interpret in situ test results in unsaturated soils. This report represents a summary of progress during the first half of the project that was partly supported by OkTC funding.
Format:

PDF
Funding:

DTRT06-G-0016
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

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urn:sha256:0baebcf3f887c2d7047fa2edb3493b42981c38041576eec22da6050ee7a3d0e3
Download URL:

https://rosap.ntl.bts.gov/view/dot/27083/dot_27083_DS1.pdf
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Interpretation of In Situ Tests as Affected by Soil Suction

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