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CPT Interpretations <br /> • <br /> U Wt Unit Weight of soil determined from <br /> J 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 <br /> TStress= y h, <br /> where )I is layer unit weight <br /> h,is layer thickness <br /> EStress -� Effective vertical overburden stress at mid layer depth I EStress=TStress-Ueq <br /> Ueq I Equilibrium pore pressure determined frnrr — - - _I - --- --- - - - --� <br /> 1) hydrostatic from water table depth <br /> 2) user supplied profile - <br /> Cn SPT N60 overburden correction factor <br /> where Q, is to tst <br /> - - - --- - -- - - - - _ - - 05<C„<20 <br /> Nso SPT N value at fi0%energy calculated from QtA ratios assigned to <br /> each SST zone <br /> (N1)6o SPT Neo value corrected for overburden pressure N160=Cn .N6 I 3 <br /> A(N1)eo Equivalent Clean Sand Correction to(N 1),, 7-_ KsPr •(Nl) - 7 <br /> 1-Ksrr , <br /> Where KsaT is defined as <br /> 0 0 for FC<5% <br /> 00167*(FC-5) for 5%<FC<35% <br /> 05 for FC>35% <br /> FC-Fines Content in% <br /> (N1)WC5 I Equivalent Clean Sand(N1)eo + (N1)w.=(N1)eo + a(Ni)so I 7 <br /> Su Undrained shear strength-Nkt is use selectable + 2 <br /> Su= <br /> Nk, <br /> k - I Coefficient of permeability(assigned to each SBT zone) f - - - g <br /> Bq Pore pressure parameter - - - - --- - - du <br /> Bq- <br /> _ Qt-� <br /> Qtn Normalized Qt for Soil B_ehavior Type c_lassifica-ti on as defined by Qt-v� - - - - - - _ -- - 4-- <br /> Robertson 1990 Qt"_ <br /> Cr <br /> Rfn Normalized Rf for Soil Behavior Type classification as defined by - - - I _ - -4 <br /> -- <br /> Robertson, 1990 R,fn=100%• s <br /> SBTn- Normalized Sail Behavior Type(slightly modified from that published by _ _ l 4 <br /> Robertson, 1990 This version includes all the soil zones of the original <br /> non-normalized SBT chart-see figure 1) <br /> Qc"l I Normalized Qt for seismic analysis qct =qc•(Pal(YY')°s 5 <br /> where Pa=atm pressure <br /> Qct N Dimensionless Normalized Qt1 - f qcl N=qc1 /Pa <br /> where Pa=atm pressure <br /> `JAREGG <br />