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■ <br /> PRECOSION <br /> • 0 <br /> 12 Interpretation <br /> CPT measurements during cone penetration include cone bearing (q), sleeve <br /> fiction (Q, and dynamic pore water pressure (u). Because these <br /> measurements relate to specific soil properties they can be used to identify <br /> soil types. <br /> Soil type interpretation of the collected parameters is represented in the color <br /> tabulation in the following appendix. This interpretation is based on <br /> correlations developed by Robertson et al, 1989 In this interpretation, <br /> friction ratio (Rf) (sleeve friction divided by cone bearing) and cone bearing <br /> are used in the attached chart to identify soil types <br /> A general observation of the measured parameters can also be used to <br /> identify soil types. The following table can be used as a guideline for basic <br /> soil type evaluations. <br /> Sand Clay <br /> Cone Bearing (qr) High Low <br /> Friction Ratio (f,/q.) Low High <br /> Pore water pressure (u) Low High <br /> 1400 South 50th Street• Richmond, CA 94804 • (510) 237-4575 • FAX (510) 237-4574 <br /> httn //www precisionmanpl=com <br /> Nationunde I7rrect-Push Serumces <br /> 1-800-671-4744 <br />