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CPT Interpretations <br /> Interpreted _ Description Equation Ref <br /> Parameter <br /> E.Stress <br /> (Tv Effective vertical overburden stress at Mid Layer Depth Estress=Tstress-uq <br /> For hydrostatic option: <br /> Equilibrium pore pressure determined from one of the <br /> following user selectable options: u„=y„•(D--D_) <br /> Ueq where uq is equilibrium pore pressure <br /> 1) hydrostatic from water table depth y,is unit weight of water <br /> 2) user supplied profile D is the current depth <br /> D,,,,i is the depth to the water table <br /> Cn=(00 <br /> Cn SPT N60 overburden correction factor where 6v'is in tsf <br /> 0.5<C„<2.0 <br /> SPT N value at 60%energy calculated from qUN ratios <br /> Neo 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 /> Nen(Ic) whereby the gttN ratio varies across soil classification See Figure i 5,$ <br /> zones based on the[c parameter. This techniques is <br /> limited to zones 2 through 7 on the normalized Soil <br /> Behavior Type Chart <br /> (Ni)ao ! SPT Neo value corrected for overburden pressure I (NrJsv=Cn •N6o 4 <br /> srr <br /> Where: Ksar is defined as: <br /> A(Ni)eu Equivalent Clean Sand Correction to(Nl)ao 0,0 for FC<5% 4 <br /> 0.0167•(FC-5) for 5%<FC<35% <br /> 0.5 for FC>35% <br /> FC-Fines Content in% <br /> (Nf)eoc, Equivalent Clean Sand(Nt)eo INi)eocs=(N1)ao + A(N1)ea f 4 <br /> . I I <br /> Su Undrained shear strength-Na is user selectable <br /> SU qt <br /> ' j 1,5 <br /> k Coefficient of permeability(assigned to each SBT zone) k 5 <br /> 1 <br /> Bq= Au <br /> qr-Cr. <br /> Bq pore pressure parameter where: Au=u-u,9 1,5 <br /> and u=dynamic pore pressure <br /> u.q=equilibrium pore pressure <br /> Normalized q,for Soil Behavior Type classification as Qt=qr-Cr, I <br /> Q, defined by Robertson, 1990 Cr I 2.5 <br /> Normalized Friction Ratio for Soil Behavior Type Fr=100*/u• fS <br /> 2,5 <br /> F, <br /> classification as defined by Robertson, 1990 <br /> SBTn Normalized Sol]Behavior Type as defined by Robertson See Figure 2 2,5 <br /> and Campanella <br /> QPEGG <br /> CPTSUMM-1.200-Rev.02.07-31 <br />