Laserfiche WebLink
EGG Cone Penetration Test Data & Interpretation <br /> Soil behavior type and stratigraphic Interpretation is based on relationships between cone <br /> bearing (q,), sleeve friction (fs), and pore water pressure (u2) The friction ratio (Rf) is a <br /> calculated parameter defined by 100fjq,and is used to infer sod 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 (uz) <br /> Cohesionless soils (sands) <br /> • Low friction ratio (R� due to large cone bearing (q,) <br /> Generate very little excess pore water pressures 02) <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 /> t 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 /> ' 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 sod <br /> ' type based solely on q,, fs, and uz 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/Nanrea,,n <br /> 1 2 " Sreained <br /> 8 2 1 Organicls <br /> tn0 8 3_ 1 clay <br /> �,T 4 1 5 S° 5 2 Cl cia <br /> r - <br /> ;b ' <br /> _6 2 5 Sand slit to cia a silt <br /> 7 3 Silty sand to sandy silt <br /> Ig 8 4 Sand to silty sand <br /> 9 5 Sand <br /> 10 fi --Gravely sand to sand <br /> 11 i Very stiff fine grained* <br /> 12 2 Mfr Sand to clayey sand* <br /> *over consolidated or cemented <br /> ' itf 1 2 3 4 5 8 7 8 <br /> Friction RsflG (96), RI <br /> Frgure 5BT <br /> 1 <br />