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CPT Interpretations <br /> U.Wt, Unit Weight of soil determined from: <br /> 1) uniform value or <br /> 2) value assigned to each SBT zone <br /> 3) user supplied unit weight profile <br /> TStres$ Total vertical overburden stress at mid layer depth <br /> TSrress y h, <br /> where n is layer unit weight <br /> h,is layer thickness <br /> EStress Effective vertical overburden stress at mid layer depth EStress= T4tress-Ueq <br /> Ueq Equilibrium pore pressure determined from: <br /> 1) hydrostatic from water table depth <br /> 2) user supplied profile <br /> CnI SPT N6o overburden correction factor I Cn=(cr jos <br /> IJI f where Q„'is in tsf <br /> 0.5<C„<2.0 <br /> NeoI SPT N value at 60%energy calculated from Qt/N ratios assigned to 3 <br /> II each SBT zone <br /> (NI)GO SPT Neo value corrected for overburden pressure f N16o=Cn,N6 l 3 <br /> a(N1)oo Equivalent Clean Sand Correction to(N1)6o I = KsPr 7 <br /> 1—KsPr <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� Equivalent Clean Sand(M)w (N1�=(N1� + e(N1)e f 7 <br /> Su Undrained shear strength-Nkt is use selectable SU= Qt-'Cr, I 2 <br /> NM <br /> k Coefficient of permeability(assigned to each SBT zone) I 6 <br /> Bq Pore pressure parameter ea I 2 <br /> Bq= <br /> Qt-a„ <br /> Qtn Normalized Qt for Soil Behavior Type classification as defined by Qt-vv 4 <br /> Robertson, 1990 Qtn <br /> Rfn Normalized Rf for Soil Behavior Type classification as defined by I 6 v f 4 <br /> Robertson, 1990 1 Rfn=100%• S <br /> li Qt-Qv <br /> SBTn Normalized Soil 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 qct =qc.(Palm'}°s ' I 5 <br /> where: Pa=atm.pressure ! <br /> QclN Dimensionless Normalized Qt1 qct N=qcl /Pa I <br /> where: Pa=atm. pressure <br /> EGG <br />