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' CPT Interpretations <br /> Interpreted Description Equation Ref <br /> Parameter <br /> qc' qt normalized for overburden stress used for seismic qct=qt•(Pal+s')o s <br /> where Pa=atm Pressure 3 <br /> analysis qt is in MPa <br /> gc1N <br /> qci to dimensionless form used for seismic analysts e—q"/ 3 <br /> where' I where Paa=atm pressure <br /> Kc= 10 for 1.51 64 <br /> Kc Equivalent clean sand correction for gc1N Kc=f(l.)for 1,> 1 64 (see reference) 3 <br /> K,= 1 0for 1 64<!c<236and Fc<05% <br />' gciNa { Clean Sand equivalent gclN gc,Ncs=gc1N•Kc i 3 <br /> IIV I !c=[(3 47—logroQ)z+(logfo Fr+ 1 22)2 f b <br /> Where Q_ grP 6LPa}" <br /> Ic Soil index for estimating grain characteristics And Fr,s <br /> in percent 11 3,8 <br />' <br /> P.=atmospheric pressure <br /> Paz=atmosphenc pressure <br /> n vanes from 0 5 to 10 and is <br /> selected in an iterative manner based on the <br />' resulting!c <br /> FC=1 75(le 25)-3 7 <br /> FC Apparent fines content(%) FC=100 for!c>3 5 3 <br /> FC=O for!c< 1 26 <br />' FC=5 oif164<!c<26ANDFr<O5 <br /> Ic< 1 31 Zone=7 <br /> This parameter is the Soil Behavior Type zone based on 1 31 2 05 c Ic<2 Zone=5 Ic<2 05 Zone=6 <br /> to Zone the Ic parameter(valid for zones 2 through 7 on SBTn 2$0< Ic<2 95 95 Zone=4 3 <br /> Chart) 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 <br /> a) Campanella and Robertson See reference 5 <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 /> Piot of SATY f(S„/av')Nc and OCR <br /> OCR Over Consolidation Ratio—2 methods available b)Based on �qr—iT 5 <br /> OCR=K. <br /> Q <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 /> REGG <br /> CPTSUMM-1 20C—Rev 02-07-31 �-�--- <br />