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CPT Interpretations Page 4/7 <br /> Interpreted <br /> Parameter Description Equation Ref <br /> • Normalized q for Soil Behavior Type classification as defined LA=qr—CF. 2,5 <br /> Q, by Robertson 1990 v <br /> Normalized Friction Ratio for Soil Behavior Type Fr=100% A <br /> F, classification as defined by Robertson,1990 qt-6. 2,5 <br /> B4= Au <br /> qt—CF. <br /> Bq Pore pressure parameter where pu=u—u 1 5 <br /> w <br /> and u=dynamic pore pressure <br /> up=equilibrium pone pressure <br /> Ic=1(3 47—kgrag2+(log,Fr+122)21" <br /> P <br /> Where Q— qr—Q. P• <br /> t, Soil Index for estimating grain characteristics And Fir Is In percent 3,8 <br /> P.=atmospheric pressure <br /> P.2=atmospheric pressure <br /> n vanes from 0 5 to 10 and is selected <br /> In an iterative manner based on the resulBng 1. <br /> FC=1 75(lc22')-3 7 <br /> FC Apparent fines content(%) FC=100 for Ic>3 5 3 <br /> FC=O for lc< 126 <br /> FC=5%if 164<Ic<2 36 AND F,<O 5 <br /> Ic<131 Zone=7 <br /> 131 <Ic<205 Zone=6 <br /> IC This parameter is the Soil Behavior Type zone based on the 2 05<Ic<2 60 Zone=5 <br /> • Zone Ic parameter(valid for zones 2 through 7 on SBTn chart) 2 60<lc<2 95 Zone=4 <br /> 3 <br /> 295<Ic<360 Zone=3 <br /> Ic>3 60 Zone=2 <br /> Relative Density determined from one of the following user <br /> selectable options <br /> Ik a)Ticino Sand See reference 5 <br /> b) Hokksund Sand <br /> c)Schmertmann 1976 <br /> d)Jamlolkowski-All Sands <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 /> 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 8,6,5 <br /> large strains based on the work by Been and Jefferies <br /> Es/qt Intermediate parameter for caiculabng Youngs Modulus,E Based on Figure 5.59 in the reference 5 <br /> in sands It Is the Y axis of the reference chart <br /> CPTSUMIA-MethodsGV122a—Rev 08-10-2004 <br />