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EAG Cone Penetration Test 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 100fjq, and is used to Infer soil behavior type Generally <br /> Cohesive soils (clays) <br /> • High friction ratio (R� due to small cone bearing (q�) <br /> • Generate large excess pore water pressures (u2) <br /> Cohesionless soils (sands) <br /> • Low friction ratio (Rh due to large cone bearing (q,) <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 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 protect 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, fs, 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 /> '1000 <br /> ZONE Qt/N SBT <br /> ' M 1 2 Sensitive, fine greamed <br /> d 2 1 Organic materials <br /> 3 1 Clay <br /> 7 <br />' .. 4 is Sd clayto clay_. <br /> C'1' 5 2 Clayey silt to siltyclay <br /> 6 6 25 <br /> 3 Sand silt to clayey silt <br />' 7 Silt sand to sand silt <br /> 70 8 4 Sand to siltysand <br /> 9 5 Sand <br />' 10 6 Gravely sand to sand <br /> 11 1 Very stiff fine grained* <br /> 12 2 Sand to clayey sand* <br /> *over consolidated or cemented <br /> Friction Rano (96), Rf <br /> Figure SBT <br />