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CPT Interpretations <br /> IU Wt Unit Weight of soil determined from <br /> 1) unrform value or <br /> 2) value assigned to each SST zone <br />' 3) user supplied unit weight profile <br /> TStress Total vertical overburden stress at mrd layer depth TStress- Y h,f <br /> 1 <br /> where n is layer unit weight <br /> hr is layer thickness <br /> EStress Effective vertical overburden stress at mid layer depth EStress=TStress--Ueq <br /> Ueq Equilibrium pone pressure determined from <br /> 1) hydrostatic from water table depth <br /> 2) user supplied profile <br />' Cn SPT Neo overburden correction factor Cn=(%)-O 5 <br /> where a„'is in fsf <br /> 05<C„<20 <br /> NW SPT N value at 60%energy calculated from QtM ratios assigned to I I 3 <br /> each SST zone !I <br /> (NI)8a SPT Neo value corrected for overburden pressure I N1w=Cn•Neo 3 <br /> A(N1)ea Equivalent Clean Sand Correction to(N1)ao A(M), = 1 KK .(NI), 7 <br /> Where KsPr is defined as <br /> 0 0 for FC<5% <br /> 0 0167•(FC-5) for 5%<FC<35% <br /> • <br /> 05 for FC y 35°.6 ' <br /> FC-Fines Cor tent in% <br /> (N1)so,, Equivalent Clean Sand(N1)so I (N1)ao.=(N1)eo + A(Nl)w { 7 <br /> Su Undrained shear strength-Nkt is use selectable i Su-Qr--cr, I 2 <br /> k Coefficient of permeability(assigned to each SBT zone) _ I 6 <br /> Bq Pore pressure parameter I 2 <br /> Bq- Air Qr-dv f <br /> I Qtn Normalized Qt for Soil Behavior Type classification as defined by On=Qt-a„ ( 4 <br /> Robertson, 1990 a v <br /> Rfi INormalized Rf for Sod Behavior Type classification as defined by A 4 <br /> Robertson, 1990 Rfn=100%�Qt-av <br /> rSBTn Normalized Sod Behavior Type(slightly modified from that published by 4 <br /> Robertson, 1990 This version includes all the soil zones of the original <br /> non-normalmad SBT chart-see figure 1) <br /> Qct Normalized Qt for seismic analysis qct =qc+(Pala,;)0 5 5 <br /> where Pa=atm pressure <br /> Qc1N Dimensionless Normalized Qt1 gc1N=qcl 1 Pa <br /> where Pa=atm pressure <br /> _qREGG <br />