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EC <br /> CONS <br /> •�..j.. ConeTec <br /> ®es® Geotechnical and Environmental Site Investigation Contractors <br /> ConeTec CPT Interpretations as of January 7, 9999 (Release 1 00.19) <br /> ConeTec's interpretation routine should be considered a calculator of current published CPT correlations <br /> I and is subject to change to reflect the current state of practice The interpreted values are not <br /> considered valid for all soil types The interpretations are presented only as a guide for geotechnical use <br /> and should be carefully scnrtinized for consideration in any geotechnical design Reference to current <br /> literature is strongly recommended <br /> The CPT interpretations are based on values of tip, sleeve friction and pore pressure averaged over a <br /> user specified interval (typically 0 25m) Note that Qt is the recorded tip value, Qc, corrected for pore <br /> pressure effects Since all ConeTec coned have equal end area friction sleeves, Fiore pressure <br /> corrections to sleeve friction, Fs, are not required <br /> The tip correction Is Qt = Qc + (1-a) •Ud <br /> Iwhere Qt is the corrected tip load <br /> Qc is the recorded tip load <br /> Ud is the recorded dynamic pore pressure <br /> a is the Net Area Ratio for the cone(typically 0 85 for ConeTec cones) <br /> ErTective vertical overburden stresses are calculated based on a hydrostatic distribution of equilibrium <br />' pore pressures below the water table or from a user defined equilibrium pore pressure profile (this can be <br /> obtained from CPT dissipation tests) The stress calculations use unit weights assigned to the Soil <br /> Behaviour Type zones or from a user defined unit weight profile <br /> Details regarding the interpretation methods for all of the interpreted parameters is given in table 1 The <br /> appropriate references referred to in table 1 are listed in table 2 <br /> The estimated Soil Behaviour Type is based on the charts developed by Robertson and Campanella <br /> shown in figure 1 <br /> Table 9 CPT Interpretation Methods <br /> Interpreted Description Equation Ref <br />' Parameter <br /> Depth mid layer depth <br /> AvgQt I Averaged corrected tip(Qt) A 1 - - <br /> Ai-Qt w <br /> Avg Fs I Averaged sleety friction(Fs) 1 <br /> AtigFs=—RFs. <br /> n <br /> Arg1l Averaged friction ratio(Rr) AtAi aFs <br /> gRf = 100%•—= <br /> A vgQf <br /> AvgUd Averaged dynamic pore pressure(Ud) 1 <br /> ,4 ti,�Ud=��Ud <br /> SBT Seil Behavior Type as defined by Robertson and Campanella 4 <br />