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' CPT Interpretations U Wt Unit Weight of soil determined from 1) uniform value or ' 2) value assigned to each SBT zone 3) user supplied unit weight profile TStress Total vertical overburden stress at mid layer depth TStress= y h, ' where n is layer unit weight hj is layer thickness EStress Effective vertical overburden stress at mid layer depth I EStress=TStress-Ueq ' Ueq Equilibrium pore pressure determined from 1) hydrostatic from water table depth 2) user supplied profile ' Cn SPT Neo overburden correction factor Cn=(a„)-0 5 where a„'is in tsf 05<C„<20 Neo SPT N value at 60%energy calculated from Qt/N ratios assigned to I 3 ' I each SBT zone (N1)eo I SPT Neo value corrected for overburden pressure I N160=Cn s N60 I 3 ' a(M)w Equivalent Clean Sand Correction to(N1)e° 0(Nl)ea Ksrr a(Nl)so 7 = 1-KspT Where K5a-r is defined as 0 0 for FC<5% 0 0167 c(FC-5) for 5%<FC<35% 06 for FC n 35% FC-Fines Content in% (N1)eocs ! Equivalent Clean Sand(N1)eo I (N1)eocs=(N1)eo + o(N1)e° I 7 Su I Undrained shear strength-Nkt is use selectable su Qr-av 2 Nkr k I Coefficient of permeability(assigned to each SBT zone) I I 6 Bq Pore pressure parameter I _ Du 2 Bq Qr-av ' Qtn Normalized Qt for Soil Behavior Type classification as defined by I On=Qt-av 4 Robertson, 1990 Cr v Rfn I Normalized Rf for Soil Behavior Type classification as defined by I Rfn=100%• fs I 4 ' Robertson, 1990 Qt-a� SBTn Normalized Snit Behavior Type(slightly modified from that published by 4 Robertson 1990 This version includes all the soil zones of the original non-normalized SBT chart-see figure 1) - Qct Normalized Qt for seismic analysis qct =qc•(Pa16,')°s 5 - where Pa=atm pressure ' Qc1 N Dimensionless Normalized Qt1 qct N=qc1 I Pa where Pa=atm pressure 1 EGG