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CPT Interpretations <br /> U Wt Unit Weight of sod determined From <br /> 1) uniform value or <br /> 2) value assigned to each SBT zone <br /> 3) user supplied unit weight profile <br /> 1 TStress Total vertical overburden stress at mid layer depth <br /> TStress y,h, <br /> where )I is layer unit weight <br /> h,is layer thickness <br /> EStress I Effective vertical overburden stress at mid layer depth I EStress=TStress—Ueq <br /> Ueq Equilibrium pore pressure determined from <br /> 1) hydrostatic from water table depth <br /> 2) user supplied profile <br /> Cn SPT Neo overburden correction factor Cn=(a„)-0 s <br /> I where U;is in tsf <br /> 05<C„<20 <br /> Neo ISPT N value at 60%energy calculated from Qt/N ratios assigned to I 3 <br /> each SBT zone <br /> (Ni)Bo I SPT Neo value corrected for overburden pressure N16o=Cn •No I 3 <br /> a(N1)eo Equivalent Clean Sand Correction to(N1)60 KKT •{NI)� 7 <br /> 1 <br /> , <br /> Where Kspr is defined as <br /> 0 0 for FC<5% <br /> 0 0167•(FC-5) for 5%<FC<35% <br /> 0 5 for FC>35% <br /> FC-Fines Content in% <br /> (N1)w,n, I Equivalent Clean Sand(Ni)eo (N1)eoe,=(Ni)Bo + A(N1)6o I 7 <br /> Su 1 Undrained shear strength-Nkt is use selectable Su=Qr— Cr, 2 <br /> Alk <br /> k Coefficient of permeability(assigned to each SBT zone) I 6 <br /> Bq Pore pressure parameter eu I 2 <br /> By=Qt—dv <br /> Qtn Normalized Qt for Soil Behavior Type classification as defined by Qrn=Qt—av 4 <br /> Robertson 1990 a <br /> Rfn Normalized Rf for Soil Behavior Type classification as defined by Rfn=100%• fs 4 <br /> ' Robertson, 1990 Qt—v� <br /> SBTn 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-normalized SBT chart-see figure 1) <br /> Qct Normalized Qt for seismic analysis qci =qc•(pa/6Y)O 5 5 <br /> where Pa=atm pressure <br /> Qct N Dimensionless Normalized Qt1 qct N=qc1 /Pa <br /> where Pa=atm pressure <br /> CEGG <br />