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} <br /> EGG Cone Penetration Test Data & Interpretation <br /> 71 <br /> Soil behavior type and stratigraphic interpretation Is based on relationships between cone <br /> bearing (q,), sleeve friction (f), and pore water pressure (u2) The friction ratio (Rf) is a <br /> }; calculated parameter defined by 100f,,1q,and Is used to Infer sod behavior type Generally <br /> I Cohesive sods (clays) <br /> • High friction ratio (Rf) due to small cone bearing (q,) <br /> • Generate large excess pore water pressures (u2) <br /> Coheslonless soils (sands) <br /> • Low friction ratio (Rf) due to large cone bearing (qJ <br /> • Generate very little excess pore water pressures (u2) <br /> A complete set of baseline readings are taken prior to and at the completion of each <br /> sounding to determine temperature shifts and any zero load offsets. Corrections for <br /> temperature shifts and zero load offsets can be extremely important, especially when the <br /> recorded loads are relatively small In sandy soils, however, these corrections are generally <br /> negligible. <br /> The cone penetration test data collected from your site is presented Inra hical form in <br /> 9 P <br /> Appendix CPT The data includes CPT logs of measured sod parameters, computer <br /> calculations of interpreted soil behavior types (SBT), and additional geotechnical parameters <br /> A summary of locations and depths is available in Table 1 Note that all penetration depths <br /> #� referenced in the data are with respect to the existing ground surface <br /> 1 Soil interpretation for this protect was conducted using recent correlations developed by <br /> Robertson et al, 1990, Figure SBT. Note that it is not always possible to dearly identify a soil <br /> type based solely on q,, f, and u2 In these situations, experience, judgment, and an <br /> assessment of the pore pressure dissipation data should be used to infer the soil behavior <br /> type. <br /> t000 <br /> ZONE SBT <br /> 1 2 Sensitive, rine Prained <br /> 91 2 1 r anie materials <br /> 3 1 Cla <br /> 9 4 1 5 111V r1AV to cla <br /> 5 2Cla silt to stl cla <br /> 6 2 5 Sand silt to c!a S[tt <br /> 7 3 Si Ity sand to sandy silt <br /> 8 4 Sand to sill sand <br /> 9 5 <br /> 90 10 6 el sand to sand <br /> 11 1 stiff fine fined* <br /> 12 2 ISiandto cla aY sand' <br /> *over consolidated or cemented <br /> 9 <br /> Fib °"RO° (%I Ftf Figure SBT <br />