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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 y h. TStress= where yt is layer unit weight h,is layer thickness EStress I 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 N60 overburden correction factor Cn=((:rv)-05 where m is in tsf 05<C„K20 N6o SPT N value at 60%energy calculated from Qt1N ratios assigned to f 3 each SBT zone C i (N 1)60 SPT N60 value corrected for overburden pressure I N7so=Cn•Neo I 3 n(N1)6o Equivalent Clean Sand Correction to(N1)eo Ksrr 7 1-Kj, Where KsFr is defined as 0 0 for FC<5% 0 0167•(FC-5) for 5%<FC<35% 05 for 1=C>35% i • FC-Fines Content rn% I (N1)6o. Equivalent Clean Sand(N1)6o I (N1)6ocs=(N 1)6o + 4(N1)6o I 7 Su Undrained shear strength-Nkt is use selectable Su=Qt- 2 Nkr k I Coefficient of permeability(assigned to each SBT zone) f 6 Bq I Pore pressure parameter I au 2 Bq= Qt-a, Qtn Normalized Qt for Soil Behavior Type classification as defined by Qi- 4 Robertson, 1990 Qin- a Rfn Normalized Rf for Soil Behavior Type classification as defined byfs 4 R Robertson, 1990 fn=100%-Ot Qv SBTn Normalized Soil Behavior Type(slightly modified from that published by 4 Robertson, 1990 This version includes all the sod zones of the original non-normalized SBT chart-see figure 1) i Qct I Normalized Qt for seismic analysis qct =qc•(Pa16, )o 5 5 where Pa=atm pressure QciN Dimensionless Normalized 01:1 qct N=qci 1 Pa where Pa=atm pressure EGG