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CPT Interpretations <br /> Interpreted Description Equation Ref <br /> Parameter <br /> qcl qt normalized for overburden stress used for seismic qc =qt•(PalaY)0-5 <br /> analysis when;: Pa=atm. Pressure 3 <br /> qt is in MPa <br /> gctN <br /> qct in dimensionless form used for seismic analysis CION=qe7 1 Pa 3 <br /> where: Pa=atm.pressure <br /> !�= 1.0 for!c s 1.64 <br /> Kc Equivalent clean sand correction for gciN Kc=f(le)for lc>1.64 (see reference) 3 <br /> Kc=1.0 for 1.64<1F<2.36 and Fc<0.5% <br /> gc1Nas I Clean Sand equivalent qc,N gefN==gCIN•Kc 3 <br /> !c 1(3.47—togfOQ)Z+(16910 Fr+ 1.22)z rOs <br /> Where: Q_Cg1—a, <br /> Ic Soil index for estimating grain characteristics And Fr is in percent J 3, 8 <br /> Pe=atmosphena pressure <br /> Pae=atmospheric pressure <br /> n vanes from 0.5 to 1.0 and is <br /> selected in an iterative manner based on the <br /> resulting 1c <br /> FC=1:75(te")-3.7 <br /> FC Apparent fines content(%} 1--C=100 for!c>3.5 3 <br /> FC=0 far!c<1.26 <br /> FC=5%if 1.64<!c<2.6 AND F,<0.5 <br /> Ic<1.31 Zone=7 <br /> This parameter is the Soil Behavior Type zone based on 1.31 <Ic<2.05 Zone=6 <br /> Ic Zone the le parameter(valid for zones 2 through 7 on SBTn 2.05<Ic<2.60 Zone=5 3 <br /> chart) 2.60<Ic<2.95 Zone=4 <br /> 2.95<Ic<3.60 Zone=3 <br /> IC>3.60 Zone=2 <br /> Friction Angle determined from one of the following user <br /> selectable options: <br /> PHI 5 <br /> a) Campanella and Robertson See reference <br /> b) Durgunoglu and Mitchel <br /> c) Janbu <br /> Relative Density determined from one of the following user <br /> selectable options: <br /> Dr a)-Ticino Sand See reference 5 <br /> b) Hokksund Sand <br /> c)Schmertmann 1976 <br /> d)Jamiolkowski-All Sands <br /> a)Based on Schmertmann's method involving a <br /> Plot of S„1(Fv'1(SJGk ')NC and OCR <br /> OCR Over Consolidation Ratio—2 methods available b)Based on <br /> OCR,=K•� <br /> 6. <br /> where an average value of k=0.3 is used <br /> State The state parameter is used to describe whether a soil is <br /> Parameter contractive(SP is positive)or dilative(SP is negative)at See reference 9,7,5 <br /> large strains based on the work by Been and Jefferies <br /> GREGG <br /> CPTSUMM-1.20C—Rev.02-07-31 <br />