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Ir <br /> 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 /> TStress�- Total vertical overburden stress at mrd layer depth TStress= y h - <br /> rwhere yr is layer and weight <br /> A is layer thickness <br /> EStress Effective vertical overburden stress at mid layer depth ---- T EStress=TSiress-Ueq� <br /> Ueq Equilibrium pone pressure determined from <br /> 1) hydrostatic from water table depth <br /> 2) user supplied profile <br /> Cn SPT Neo overburden correction factor <br /> where cV is in tsf <br /> 0 5<Cn<2 0 SPT N value at 60%energy calculated from(WN ratios assigned to — - _ 3 <br /> each SBT zone <br /> {N1 SPT Neo value corrected for overburden pressure -- - N16o=Cn.Neo - - -3 <br /> a(N1)eo Equivalent Clean Sand Correction to(N1)6o K,-,pr — -7 <br /> a(NL}w = • <br /> 1-Ksrr (NI), <br /> ' Where KsP-r is defined as <br /> 0 0 for FC<5% <br /> 0 0167•(FC-5) for 5%<FC a 35% <br /> 05 for FC>35% <br /> FC-Fines Content in% <br /> (N1) ----Equivalent Clean Sand(N1�o - --- -------- (Ni)�=(N1)eo + e(N1)eo_- -7- <br /> -§-u----- Undrained shear st-re n­gth-Nkt is use selectable - -- Su=Qt-vY �- - 2 <br /> Nk, <br /> Coefficient of permeability(assigned to each SBT zone)- --�----�-- � 6 <br /> Bq Pore pressure parameter B _ eu 2 <br /> Noririal¢ed Qt for Soil Behavior Type classification as defined by Qm_Qt-aY 4 <br /> Robertson, 1990 <br /> 0- v <br /> Normalized Rf for Soil Behavior Type classification as defined by -- <br /> R -1-- fs 4 <br />' Robertson, 1990 --Qt-_a� ----- -- - <br /> SBTn Normal¢ed 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 /> - -- ----� -- _` ----—_ -r <br /> Qct- Normalized Qt for seismic analysis — qc1 =qc e(Pa/6,)O5 5- <br /> where Pa=atm pressure <br />' <br /> _dc',W-- Qimensionless Normalized Qt1 qct N=qc1 !Pa �- <br /> where Pa=atm pressure <br /> GREGGr <br /> I <br /> r <br />