Laserfiche WebLink
4.CONE PENETRATION TEST DATA & INTERPRETATION <br />The Cone Penetration Test data is presented in graphical form in the attached Appendix. <br />These plots were generated using the CPeT-IT program. Penetration depths are referenced to <br />ground surface. The soil classification on the CPT plots is derived from the attached CPT <br />Classification Chart (Robertson) and presents major soil lithologic changes. The stratigraphic <br />interpretation is based on relationships between cone resistance (qc), sleeve friction (fs), and <br />penetration pore pressure (u). The friction ratio (Rf), which is sleeve friction divided by cone <br />resistance, is a calculated parameter that is used along with cone resistance to infer soil <br />behavior type. Generally, cohesive soils (clays) have high friction ratios, low cone resistance <br />and generate excess pore water pressures. Cohesionless soils (sands) have lower friction <br />ratios, high cone bearing and generate little (or negative) excess pore water pressures. <br />The CPT data files have also been provided. These files can be imported in CPeT-IT (software <br />by GeoLogismiki) and other programs to calculate various geotechnical parameters. <br />It should be noted that it is not always possible to clearly identify a soil type based on qc, fs and <br />u. In these situations, experience, judgement and an assessment of the pore pressure data <br />should be used to infer the soil behavior type. <br />If you have any questions regarding this information, please do not hesitate to call our office at <br />(714) 901-7270. <br />Sincerely, <br />KEHOE TESTING & ENGINEERING <br />Steven P. Kehoe <br />President <br />10/02/19-hh-0922 <br />73 of 100 <br />1327 S Grand Ave <br />12/12/2024