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' CPT Interpretations <br /> Interpreted Description Equation Ref <br /> Parameter <br /> E Stress <br /> (;v Effective vertical overburden stress at Mid Layer Depth Fstress= Tstress-u,,q <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 uQq is equilibrium pore pressure <br /> 1) hydrostatic from water table depth -fw is unit weight of water <br /> 2) user supplied profile D is the current depth <br />' D.,s the depth to the water table <br /> CR=(6v�-0 5 <br /> Cn SPT Neo overburden correction factor where 6„'rs in tsf <br /> 05<C„<20 <br /> SPT N value at 60%energy calculated from qt/N 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 Jeffenes and Davies technique <br /> whereby the qt/N ratio vanes across soil classification <br /> N8o(I C) See Figure 1 5,8 <br /> zones based on the Ic parameter This techniques is <br /> limited to zones 2 through 7 on the normalized Soil <br /> Behavior Type Chart <br /> (Ni)eo SPT N80 value corrected for overburden pressure (Ni)so=Cn .Nw I 4 <br /> fio <br /> I—K.. <br /> Where KsPT is defined as <br /> 4(Nt)6o Equivalent Clean Sand Correction to(Ni)eo 4 <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 />' (Nl)w. I Equivalent Clean Sand(NI)eo (141)6oc-s=(N1)eo + A(N1)eo 4 <br />' Su Undrained shear strength-Nki is user selectable 5u=gr N 1,5 <br /> k Coefficient of permeability(assigned to each SBT zone) M I 5 <br />' <br /> Bq= <br /> Qu <br /> qr-or, <br /> Bq Pore pressure parameter where Au=u-u,9 1 5 <br /> and u=dynamic pore pressure <br /> u,,,=equihbnum pore pressure <br /> Normalized qt for Soil Behavior Type classification as q <br /> I Qr- �t? <br /> 2 5 <br /> Qt I defined b Robertson, 1990 <br /> Normalized Friction Ratio for Soil Behavior Type _ o fs <br /> Fr-160% 2, 5 <br /> F, classification as defined by Robertson, 1990 qr-6, <br /> SBTn Normalized'Soil Behavior Type as defined by Robertson See Figure 2 2,5 <br /> and Campanella <br /> REGG <br /> CPTSUMM-1 20C-Rev 02-07-31 <br />