United States Department of Transportation
i
Procedures for Establishing Geotechnical Design Parameters from Two Data Sources
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2013-07-01
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[PDF-1016.73 KB]
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Abstract:The Missouri Department of Transportation (MoDOT) recently adopted new provisions for geotechnical design that require that the mean value and the coefficient of variation (COV) for the mean value of design parameters be established in order to determine appropriate values for resistance factors to be used for design of specific projects. Current guidelines include provisions to establish appropriate values for the mean and COV of the mean for relevant design parameters based on lab or field measurements made for a specific project. This report describes procedures developed to establish geotechnical design parameters and their variability when there are two sources of data that can be used to estimate values for the design parameter. The proposed procedures include methods for establishing the mean and COV of the mean for a design parameter from “surrogate” measurements that can be related to the design parameter of interest as well as procedures for establishing the mean and COV for a design parameter from combined direct and surrogate measurements. The procedures are demonstrated through application to direct measurements of uniaxial compressive strength and surrogate Standard Penetration Test (SPT) measurements in Missouri shales. Results of analyses presented demonstrate that use of combined direct and surrogate measurements produces smaller values of COV when compared to use of direct measurements alone but that the magnitude of the reduction in COV depends on the number of direct and surrogate measurements available and on the variability and uncertainty present in the relation between the surrogate measurements and the design parameter of interest. Results of the analyses also show that SPT measurements are generally a poor predictor of uniaxial compressive strength and drilled shaft capacity in shale when compared to direct measurements of uniaxial compressive strength.
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