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1 <br /> CPT Interpretations <br /> I.. <br /> U.VVt. 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 /> TStress Total vertical overburden stress at mid layer depth TStress=S y!h, <br />' where r,is layer unit weight <br /> h;is layer thickness <br />' EStress Effective vertical overburden stress at mid layer depth 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={,xj7-0'5 <br /> where m'is in tsf <br />' 1 0.5<C„<2.0 <br /> Neo SPT N value at 60%energy calculated from Qt1N ratios assigned toI 3 <br /> each SBT zone 1 <br /> (N1)so I SPT Neo value corrected for overburden pressure- I N1eo=Cn .Nso I 3 <br /> I0(N1)80 Equivalent Clean Sand Correction to(N1)oo A(Na),, = 1 'SKr •(N3), 7 <br /> srr <br />' Where: Ksar is defined as: <br /> 0.0 for FC<5% <br /> 0.0167.(FC-5) for 5%<FC<35% <br /> 0.5 for FC>35°h <br /> 10 <br /> FC-Fines Content in% <br /> (N1)60(, Equivalent Clean Sand(N1)m (NI)$Ow=(N1)w + a(N1)so 7 <br /> 1 Su Undrained shear strength-Nkt is use selectable SU=Qt-r'r,. 2 <br /> Nor <br /> k Coefficient of permeability(assigned to each SBT zone) I I 6 <br /> Bq €f Pore pressure parameter I 4u I 2 Bq=Q, dy <br /> Qtn Normalized Qt for Soil Behavior Type classification as defined by I Om=Qt--Cr, 4 <br /> Robertson, 1990 ! a <br /> Rfn Normalized Rf for Soil Behavior Type classification as defined by f f 4 <br /> Robertson, 1990 I Rfn=1oD%• s <br /> Qt_6.v <br /> SBTn Normalized Soil Behavior Type(slightly modified from that published by 4 <br /> Robertson, 1990. This version includes ail the soil zones of the original <br />' non-nornraiized SBT chart-see figure 1) <br /> Qct I Normalized Qt for seismic analysis qci =qc•(Pa/cr')o 5 I 5 <br /> where: Pa=atm_ pressure <br /> Qci N Dimensionless Normalized Qt1 qct N=qc1 1 Pa <br /> where: Pa=atm. pressure <br /> 0 <br /> EGG <br /> I <br /> I ' <br />