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PRECISION <br /> 1.2 Interpretation <br /> i <br /> CPT measurements during cone penetration include cone bearing (q j, sleeve <br /> friction (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 /> Soile interpretation typ terp etatron•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 (qc) High Low <br /> Friction Ratio (f,/q,) Low High <br /> Pore water pressure (u) Low High <br /> 3 <br /> 1400 South 501h Street • Richmond, CA 94804 • (510) 237-4575 • FAX: (510) 237-4574 <br /> http://www.precisionsamnling.com <br /> Nationwide Direct-Push Services <br /> 1-800-671-4744 <br /> 1 � , <br /> f <br />