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CPT Interpretations <br /> • Interpreted Description Equation Ref <br /> Parameter <br /> qc, qc5=qt a(Pak ')o.s <br /> qt normalized for overburden stress used for seismic Where: Pa=atm.Pressure 3 <br /> analysis qt is in MPa <br /> qc,N - - - -- - -qe,N=qc,!Pa <br /> qct in dimensionless form used for seismic analysis 3 <br /> where: Pa=atm.pressure <br /> Kc= 1.0 for 1c s 1.64 <br /> Kc Equivalent clean sand correction for qc,N Kc=f(Ic)for 1.> 1.64 (see reference) 3 <br /> Kcal 1.0 for 1.64<1c<2.36and Fc<0.5% <br /> gc,Ncs 1 Clean Sand equivalent qc,N gclNcs=4c1N a Kc 1 3 <br /> 1c=I(3A7—Iog1oQ) +(log,o Fr+1.22j2 f s <br /> n <br /> Where: qr—6,. Pa <br /> Q= F., Q, <br /> Ic Soil index for estimating grain characteristics And Fr is in percent 3.8 <br /> Ps=atmospheric pressure <br /> Paz=atmospheric pressure <br /> n varies from 0.5 to 1.0 and is <br /> selected in an iterative manner based on the <br /> resulting Ic <br /> FC=1.75(l 2�)-3.7 <br /> FC Apparent fines content(%) FC=100 for Ic>3.5 3 <br /> FC=O for Ic< 1.26 <br /> FC=5%if 1.64<Ic<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 < le<2.05 Zone=6 <br /> Ic Zone the Ic parameter(valid for zones 2 through 7 on SBTn 2.03< Ic<2.60 Zone=5 3 <br /> 2.60<Ic<2.95 Zone=4 <br /> chart) 2.95<is<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 SutcFv/(Su16,')NC and OCR <br /> OCR Over Consolidation Ratio—2 methods available b)Based ongr—6n 5 <br /> OCR=Ko <br /> 60 <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 /> rq <br /> CPTSUMM-1.20C—Rev.02-07-31 �------. <br />