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+ CPT Interpretations <br /> Interpreted <br /> J Parameter Description Equation Ref <br /> ' E.Stress <br /> E ' <br /> 6v Effective vertical overburden stress at Mid Layer Depth <br /> 1;stress=Tsfress-ucq <br /> a <br /> For hydrostatic option: <br /> Equilibrium pore pressure determined from one of the <br /> E following user selectable options: u.V_Y.a(D_D„) <br /> Ueq where uq is equilibrium pore pressure <br /> 1 1) hydrostatic from water table depth <br /> 2) user supplied profile yw is unit D is the weight offwater <br /> depth <br /> Dwt is the depth to the water table <br /> f � , <br /> Cn=(vjo5 <br /> Cn SPT Neo overburden correction factor where o„'is in tsf <br /> 0,5<Cn<2.0 <br /> SPT N value at 60%energy calculated from gt/N ratios <br /> N6a assigned to each SBT zone. This method has abrupt N See Figure 1 4,5 <br /> value changes at zone boundaries. <br /> SPTN Value at 60%energy. This method is a slight <br /> modification of the Jefferies and Davies technique <br /> Neo(IC) whereby the qt/N ratio varies across soil classification <br /> II zones based on the Ic parameter. This techniques is See Figure 1 5,8 <br /> limited to zones 2 through 7 on the normalized Soil i <br /> Behavior Type Chart <br /> (Ni)6a SPT Neo value corrected for overburden pressure l (Nr)ao=Cn.Nw 4 <br /> 4(Nj,_ K •(NI), <br /> sir <br /> i <br /> Where: Ksp-r is defined as: <br /> 4(Nl)w Equivalent Clean Sand Correction to(N1)6o 4 <br /> 0.0 for FC<5% i <br /> 0.0167•(FC-5) for 5%<FC<35% <br /> 0.5 for FC>35% <br /> FC-Fines Content in% <br /> (N,)6o. Equivalent Clean Sand(Nt)6o (N1)eocs=(N1)60 + A(N1)6o 4 <br /> Su Undrained shear strength-Nkt is user selectable Su=q1 Cr, 1,5 <br /> N„ <br /> k Coefficient of permeability(assigned to each SBT zone) f 5 <br /> I <br /> Bq_ Au <br /> qt-�, <br /> F i <br /> Bq Pore pressure parameter where: Au=u-u, 1,5 <br /> k and u=dynamic pore pressure <br /> ueq=equilibrium pore pressure <br /> 4 <br /> Normalized q,for Soil Behavior Type classification as Qr=qt 6.L <br /> Qt defined by Robertson, 1990 9 2,5 <br /> Normalized Friction Ratio for Soil Behavior Type Fr=100%• fs <br /> Fr classification as defined by Robertson, 1990 q1_6. I 2,5 <br /> SBTn Normalized Soil Behavior Type as defined by Robertson See Figure 2 2.5 <br /> and Campanella <br /> Q <br /> EGG <br /> CPTSUMM-1.20C-Rev.02-07-31 <br />