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CPT Interpretations <br />' U Wt Unit Weight of sod 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= y h <br /> , <br /> where n is layer unit weight <br /> hr 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 Ngo overburden correction factor Cn=(a„)-0 5 If <br /> where av is in tsf <br /> I <br /> 05<C„<20 <br />' Nsa SPT N value at 60%energy calculated from QUN ratios assigned toI 3 <br /> each SBT zone <br /> (Ni)eo I SPT Noo value corrected for overburden pressure I Mea=Cn •N6 3 <br />' 0(N1)80 Equivalent Clean Sand Correction to(N1)6a Ksar • Ni 7 <br /> ( )so <br /> 1—Ksvr <br /> Where KsPT 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 /> FC-Fines Content in% <br /> (N1)w= I Equivalent Clean Sand(N1)eo I (N1)m,s=(N1)8o + t1(N1)6o I 7 <br />' Su Undrained shear strength-Nkt is use selectable Su-Qt-a„ 2 <br /> No <br />' k I coefficient of permeability(assigned to each SBT zone) I 6 <br /> Bq I Pore pressure parameter _ Au 2 <br /> Bq Qt-a� <br />' Qtn Normalized Qt for Sod Behavior Type classification as defined byI Qtn;Qt-av 4 <br /> Robertson, 1990 a v <br /> Rfn Normalized Rf for Sod Behavior Type classification as defined by ° f., 4 <br /> Robertson, 1990 I Rfir=100/°• <br /> Qt-a„ <br /> SBTn Normalized Sod 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 analysisI qct =qc•(Pat6,r')o 5 I 5 <br /> where Pa=atm pressure <br /> Qct N Dimensionless Normalized Qt1 qci N=qc1 t Pa <br /> where Pa=atm pressure <br /> 1 <br /> EGG <br /> t <br />