United States Department of Transportation
i
Evaluation of cone penetration testing (CPT) for use with transportation projects.
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2011-04-01
[PDF-58.38 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology;NTL-REFERENCES AND DIRECTORIES-Statistics;
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Abstract:Cone Penetration Testing (CPT) has many advantages as a means for subsurface investigation. CPT consists of pushing a steel
cone into the ground and recording the penetration resistance using sensors. Pore pressure, shear wave velocity and other
measurements can also be taken using CPT. Several states have incorporated CPT into their subsurface investigation
programs and the Ohio Department of Transportation (ODOT) has funded this project as a first step toward routine use of
CPT in Ohio. CPT soundings were completed at 20 sites throughout Ohio and the data were correlated with corresponding
data obtained from standard penetration and laboratory testing. Clear correlation trends for the 17 different ODOT soil
types were not obtained and a larger database is needed to improve the correlations. Guidelines for CPT machine operation
and data analysis are presented. Existing correlations for engineering parameters are also discussed. CPT is expected to
become a useful tool for ODOT subsurface exploration work and provide considerable cost savings over the long term.
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