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CPT Interpretations <br /> ' Interpreted Description Equation Ref <br /> Parameter <br /> qctav')6.5 <br /> qt normalized far overburden stress used for seismic qct=qt• (Pa/ <br /> Where: Pa=atm.Pressure 3 <br /> analysis qt is in MPa <br /> get,♦ I gc1N=qn/Pa <br /> l qct in dimensionless form used for seismic analysis where: Pa=atm.pressure 3 <br /> ' l <br /> &=1.0 for lcc 1.64 <br /> Kc Equivalent clean sand correction for q,-1N Kc=f{lc)for lc> 1.64 (see reference) 3 <br /> Kc=1.0 for 1.64<lc<2.3 6 and Fc<0.5% <br /> gclNas Clean Sand equivalent q0N I gclNcs=9e1N a Kc 3 <br /> i 16=((3.47—IOgroQ)z}(10gro Fr+1.22)2 f5 <br /> ' Mere: (q '- <br /> !?= poi <br /> ' Ic Soil index for estimating grain characteristics And Fr is in percent 3, 8 <br /> Pm=atmospheric pressure <br /> Pae=atmospheric pressure <br /> n varies from 0.5 to 1.0 and is <br /> selected in an iterative manner based on the <br /> ' resulting!c <br /> FC=1.75(le-")-3.7 <br /> FC Apparent fines content(%) FC=100 for to>3.5 3 <br /> FC=0 for is< 1.26 <br /> ' FC=5%if 1.64<!c<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 /> Ic Zone the Icarameter valid for zones 2 throug h 7 on SBTn 2.05<Ic<2.60 Zone=5 3 <br /> chart)p { 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 Schmertmpnn's method involving a <br /> ' plot of S„l6,;/(Su/Q„)Nc and OCR <br /> OCR Over Consolidation Ratio—2 methods available b)Based on ql—Q,� 5 <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 /> t GC <br /> CPTSUMM-1.200—Rev.02-07-31 <br /> 1 <br />