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EGG Cone Penetration Test Data & Interpretation <br />' Soil behavior type and stratigraphlc 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 100f1q, and is used to Infer soil behavior type Generally <br />' Cohesive soils (clays) <br /> High friction ratio (Rf due to small cone bearing (q,) <br /> Generate large excess pore water pressures (u2) <br />' Cohesionless soils (sands) <br /> O Low friction ratio (Rf) due to large cone bearing (qJ <br />' O 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 /> 10 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 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 soil behavior <br /> type <br /> ZONE Qt/N SBT <br /> 12- <br /> 1 2 Sensitive, fine greained <br /> C5 ;$G s 2 J 1 Organic materials <br /> 10D 3 1 Clay <br /> ,fn a 15 Silty clay to clay <br /> 5 2 Clayey silt to sil clay <br /> 6 2 .5 J Sandy silt to clayey silt <br /> 7 3 Sdty sand to sand silt <br /> 8 4 Sand to silty sand <br /> 9 S Sand <br /> 10 6Gravely sand to sand <br /> X1 1 very stiff fine grained* <br /> 12 2 ` Sand to clayey sand* <br /> 1 *over consolidated or cemented <br /> I 0 1 2 3 4 5 8 7 8 <br /> FrlCOM Raft (36), RF <br /> Figure SBT <br /> I <br />