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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 /> _Stress Total vertical overburden stress at mrd layer depth _Stress Y.h, <br /> where yr rs layer unit weight <br /> h,is layer thickness <br /> EStress` Effective vertical overburden stress at mid layer depth -— - __ - - EStress=_Stress-Ueq ---- -Y <br /> Ueq Equilibnum pore pressure determined from <br /> 1) hydrostatic from water table depth <br /> 2) user supplied profile <br /> Cn SPT Neo overburden correction factor - - Cn_(nj05 - ---- <br /> where cr„'is in tsf <br /> 05<C„<20 <br /> Nen SPT N value at 60%energy calculated from Qt/N ratios assigned to each - - 3 - <br /> SBT zone <br /> (N1]so SPT No value corrected for overburden pressure N1"=Cn•NOO 3- <br /> e(Nll oa Equivalent Clean Sand Correction to(Ni)oo 0(Nl),o = Ks'r •{NI)� 7- <br /> 1-Ks, <br /> Where Ksrr is defined as <br /> 0 0 for FC<5% <br /> 0 0167•(FC-5) for 5%<FC<35% <br /> 05 for FC n 35% <br /> FC-Fines Content in% <br /> Equivalent Cleary Sand(Ni),, _---____—_ __ _ (N1)eo�=(N1)eo + 6(N1)eo <br /> Su Undrained shear strength-Nkt is use selectable_-�--- - --- Su=Qt-a -----� 2- <br /> N,a <br /> k Coefficient of perrrieability(assigned to each SBT zone)- - - -- - -- _ ---- I g <br /> Bq Pore pressure parameter Du - 2 <br /> _ Bq-Qt-vv <br /> Qin Normalized Qt for Soil Behavior Type classification as defined by - Qr-Q,. - - - 4- <br /> Robertson,1990 Qtn- <br /> Rfn Normalized Rf for Soil Behavior Type ckassiflcation as defined byj, <br /> Q 4 <br /> Robertson, 1990 - - - =i�°/a•�7. <br /> -av <br /> SBTn Normalized Soil Behavior Type(slightly modified from that published by 4- <br /> Robertson,1990 This version includes all the sod zones of the original <br /> non-normalized SBT chart-see figure 1) <br /> Qct Normalized Qt for seismic analysis qct =qc•(Pal(r„')o s - _ 5 - <br /> where Pa=atm pressure <br /> Qci N Dimensionless Normalized Qti -- - - qct N=qc1/Pa <br /> where Pa=atFn pressure <br />