ARCHIVED REPORTS_XR0008970 - Laserfiche WebLink

Home Browse Search

CONE K ConeTec — --- Geotechnical and Environmental Site Investigation Contractors ' ConeTec CPT Interpretations as of January 7, 1999 (Release 100-19) ConeTec's interpretation routine should be considered a calculator of current published CPT correlations ' and is subject to change to reflect the current state of practice The interpreted values are not considered valid for all soil types The interpretations are presented only as a guide for geotechnical use and should be carefully scrutinized for consideration in any geotechnical design Reference to current literature is strongly ' recommended The CPT Interpretations are based on values of tap, sleeve fnctaon and pore pressure averaged over a user specified interval (typically 0 25m) Note that Qt is the recorded tip value, Qc,' o rec e f coor rrections s pressure leeve effcts Since all ConeTec cones have equal end area friction sleeves, pore pr friction, Fs, are not required ' The tap correction is Qt = Qc t (1-a) v Ud where Qt is the corrected tap load Qc is the recorded tap load ' Ud is the recorded dynamic pore pressure a is the Net Area Ratio for the cone(typically 0 85 for ConeTec cones) Effective vertical overburden stresses are calculated based on a hydrostatic distribution of equilibrium pore pressures below the water table or from a user defined equilibrium pore pressure profile (this can be obtained from CPT dissipation tests) The stress calculations use unit weights assigned to the Soil Behaviour Type zones or from a user defined unit weight profile lie Details regarding the interpretation methods for all of the interpreted parameters is given in table 1 The appropriate references referred to in table 1 are listed in table 2 ' The estimated Soil Behaviour Type is based on the charts developed by Robertson and Campanella shown in figure 1 ' Table i CPT Interpretation Methods FAvgQt erpreted Description Equation Ref ' rameter - pth mid layer depth Averaged corrected tip lot) 1 AvgQ1=— —Qt AvgFs Averaged sleeve friction(Fs) AvgFs=1 Fs, A,vgRf Averaged fnctton ratio(Rf) AvgFs AvgRf=100%* AvgQt AvgUd Averaged dynamic pore pressure(Ud) 1 AvgUd=-Y-Ud, SBT Sar Behavior Type as defined by Robertson and Campanella