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1 <br /> CPT Interpretations <br />' U.M. 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 /> r ' <br /> TStress Total vertical overburden stress at mid layer depth TStress= <br /> EY,h, <br /> where h is layer unit weight <br /> h,is layer thickness <br /> r EStress Effective vertical overburden stress at mid layer depth EStress= TStress-Ueg I <br /> Ueq Equilibrium pore pressure determined from: i <br /> 1) hydrostatic from water table depth <br /> 2) user supplied profile <br /> Cn I SPT Neo overburden correction factor Cn=(,T,yo.6 <br /> where a.'is to tsf <br /> 0.5<C„<2.0 <br /> Nso SPT N value at 606/6 energy calculated from Qt1N ratios assigned to each 3 <br /> SBT zone <br /> (N1)so I SPT Neo value corrected for overburden pressure Mr.0=Cn.Nm 3 <br /> rA(N1)80 Equivalent Clean Sand Correction to(N 1),, A(M), = Kir -(NI 7_ <br /> 1-KAT ), <br /> Where: KISPT 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 /> r . FC-Fines Content in% <br /> {N1)60ts I Equivalent Clean Sand(N1)eo I (N1)eocs=(N1)Bo + 4(N1)oo ( 7 <br />' Su Undrained shear strength-Nkt is use selectable <br /> S._Qt-av f 2 <br /> Nor <br />' k Coefficient of permeability(assigned to each SBT zone) i g <br /> Bq I Pore pressure parameter I Au 2 <br /> B4= <br /> r Qt_�� <br /> Qtn Normalized Qt for Soil Behavior Type classification as defined by �n-Qt-dv 4 <br /> Robertson, 1990 a <br /> Rfn Normalized Rf for Sal Behavior Type classification as defined byf3 4 <br /> 199 <br /> Robertson, 0 Rfn=100%• <br /> -6v <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 /> norr-normalized SBT chart-see figure 1) <br /> Qcl Normalized Qt for seismic analysis qct =qc•(Pafaj s 5 <br /> where: Pa=atm.pressure <br /> Qct N Dimensionless Normalized Qt1 ! qc1 N=qcl/Pa <br /> where: Pa=atm. pressure <br /> r <br /> EGG <br /> r <br />