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E"GGCone Penetration Test D <br />' Data & interpretation <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 100flq, and is used to Infer soil behavior type Generally <br /> Cohesive sods (clays) <br /> • <br /> High friction ratio (Rf) due to small cone bearing (q,) <br />' Generate large excess pore water pressures (u2) <br /> Cohesion less soils (sands) <br /> D Low friction ratio (Rf) due to large cone bearing (qJ <br /> r © 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 In graphical form In <br /> Appendix CPT The data Includes CPT logs of measured soil 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 />' Soil Interpretation for this project was conducted using recent correlations developed by <br /> Robertson et al, 1990, Figure SBT Note that It Is not always possible to clearly 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 sod behavior <br /> type <br /> Gad � '�:� ZONE Qt/N <br /> xk` � Y SBT <br /> 1 2 Sensitive, fine greamed <br /> Organic materials <br /> 100 '- � 8 yA` 3 1 Clay <br /> 4 15 Siltyclayto cla <br /> 5 2 Clayey silt to siltyclay <br /> 6 25 Sandy silt to clayey silt <br /> 7 3 Sil sand to sandsilt <br /> 10 8 4 Sand to silty sand <br /> 9 5 'h Sand <br /> 10 6 Gravel sand to sand <br /> it 1 very stiff fine grained* <br /> 12 2 Sand to clayey sand* <br /> 1 0 1 2 3 4 s g y *over consolidated or cemented <br /> Frit m Hallo (96), Rf <br /> Figure SBT <br /> I <br />