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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 /> TStress Tota! - <br /> vertical overburden stress at mid layer depth— -- - - TStress=I y,h, --'----- <br /> ' where Y is layer unit weight <br /> h,is layer thickness <br /> ' S <br /> t <br /> r <br /> es <br /> s — 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 Nao overburden correction factor <br /> where a„'is in tsf <br /> ' Na° SPT N sail ue�6691.energy catcuIated from& ratios assigned to each 3 <br /> SBT zone <br /> (N1)e°'- - SPT Nso value corrected for overburden pressure N1 eo=Cri N641 3 <br />' A(N1Equivalent Clean Sand Correction to(N1}eo e(Nl) - Ksrr (N1}� <br /> w - <br /> 1-Ksar <br /> Where Ksar is defined as <br /> 0 0 for FC<5% <br /> 0 0167•(FC-5) for 5%<FC<35% <br /> 05 for FC>35% <br /> FC-Fines Content in% <br /> (M)60. Equivalent Clean Sand(N1)so ----- v (N1)som=(N1)6o + a(M)BG --- 7 - <br /> Undrained shear strength-Nkt is use selectable -- Su=Qr-av 2- <br /> N,� <br />' k ---- Coefficient of permeability(assigned to each SBT zone)- --- ---— ----- 6- <br /> Bq Pore pressure parameter — Bq= 2u 2 <br /> Qr-a„ <br />' Qtn W Normalized Qt for Soil Behavior Type classification as defined by ---� Qin=Qt-a„ —W- - u- _a <br /> Robertson,1990 a <br /> Normalized Rf for Sal Behamor Type classrfication as defined by---� Rfn100% js------ --- -4 <br /> 96 - <br /> -_---- Robertson,79 - = • _----- --------- -- _Qt a4 <br /> SBTn Normalized Soil Behamor Type(slightly modified from that published by 4 - <br /> Robertson, 1990 This version includes all the soil zones of the onginal <br />' - ---- non-normalized SBT chart-see figure 1) --- -_-- ------ - ---- -_-- T_ - <br /> Qci Nommalrzed Qt for seismic analysis qct =qc•(Pala„')°5 5 <br /> where Pa=atm pressure <br /> Qe1 N Dimensionless Normalized Qt1 qct N-qc1 /Pa --�_ <br /> where Pa=atm pressure <br /> 1 <br /> CONE EC <br /> t <br /> C—� <br />