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CPT Interpretations <br /> Interpreted 1 Description Equation Ref <br /> Parameter <br /> qC1 qt normalized for overburden stress used for seismic qct=qt.(Par6„')DA <br /> analysis where: Pa=atm.Pressure 3 <br /> q,is in MPs <br /> qnN I gatN=qc1 1 Pa. <br /> qct in dimensionless form used for seismic analysis where: Pa=atm.pressure 3 <br /> 1Cc= 1.0 for Ic s 1.64 <br /> K. Equivalent clean sand correction for gc1N Kc=f(I j fir lc> 1.64 (see reference) 3 <br /> Kc= 1.0 for 1.64<lc<2.36and Fc<0.5% <br /> gc,Ncs Clean Sand equivalent gc1N gcl&ts=gc,N-Kc 3 <br /> Ic=[(3.47—log 1OQ)2+(logia Fr+122)2,a.a <br /> When:: Q T(q,ptr0'.}�a.l• <br /> I� Soil index for estimating grain characteristics And Fr is in percent ) 3,8 <br /> P,=atmospheric pressure <br /> P,2=atmospheric pressure <br /> n varies from 0.5 to 1.0 and is <br /> selected in an iterative manner based on the <br /> resulting 1c <br /> FC=1--75(k325)-3.7 <br /> FC Apparent fines content FC=100 for lc>3.5 3 <br /> FC=0 fork< 1.26 <br /> FC=5%if 1.64<Ic<2.6 AND Fr<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 /> • 2.05<Ic Zone the Ic parameter valid for zones 2 through h 7 on SBTn <2.60 Zone=5 3 <br /> p ( 2.60<le<2.95 Zone=4 <br /> chart) 2.95<Ic<3.60 Zone=3 <br /> 1c>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) Flokksund Sand <br /> c)Schmertmann 1976 <br /> d)Jamiolkowski-All Sands <br /> a)Based on Schmertmann's method involving a <br /> plot of Sui6v'1(Sukad)Nc and OCR <br /> OCR Over Consolidation Ratio—2 methods available b)Based on qr—p-,� 5 <br /> OCR=K• <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 /> CPTSLIMM-1.20C—Rev-02-07-31 <br />