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CPT Interpretations <br /> interpreted Description Equation Ref <br /> Parameter <br /> • E Stress <br /> 6v Effective vertical overburden stress at Mid layer Depth Estvess Tsbess-ueQ <br /> For hydrostatic option <br /> Equilibrium pore pressure determined from one of the <br /> following user selectable options <br /> uY=r.•{�-�„) <br /> Ueq where u.q is equilibrium pore pressure <br /> 1) hydrostatic from water table depth 1.is unit weight of water <br /> 2) user supplied profile D is the current depth <br /> Dm is the depth to the water table <br /> Cn=(0�7-0 5 <br /> Cn SPT Nw overburden correction factor where m is 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 /> $PTN Value at 60%energy This method is a slight <br /> modification of the Jeffenes and Davies technique <br /> Neff(Ic) whereby the qt/N ratio vanes across soil classification 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 Sod <br /> Behavior Type Chart <br /> (Ni)ao SPT Neo value corrected for overburden pressure (Ni)w=Cn.Arco 4 <br /> K <br /> A(N,)w=1-K •(Ni)w <br /> spy' <br /> Where Ksar rs defined as <br /> A(NI)ap Equivalent Clean Sand Correction to(Nl)eo 4 <br /> 0 0 for FC<5% <br /> 0 0167 s(FC-5) for 5%<FC<35% <br /> 05 for FC>35% <br /> FC-Fines Content in% <br /> (N1)eas Equivalent Clean Sand(NI)eo (N1)aom=(Nt)w + A(N1)eo 4 <br /> Su Undrained shear strength-Nu is user selectableI Su=qt <br /> ' 1,5 <br /> N. <br /> k Coefficient of permeability(assigned to each SBT zone) 5 <br /> _ Au <br /> $q-qr-Q. <br /> Bq Pore pressure parameter where Ax=a-eR 1,5 <br /> and u=dynamic pore pressure <br /> ueq=equihbnum pore pressure <br /> Normalized q,for Sod Behavior Type classification as Qr=it-cr• 2,6 <br /> Qe defined try Robertson, 1990 or <br /> Normalized Friction Ratio for Sod Behavior Type Fr=100%• fS 2,5 <br /> Fr classification as defined by Robertson,1990 qt-or, <br /> SBTn Normalized Sod Behavior Type as defined by Robertson See Figure 2 2,5 <br /> and Campanella <br /> QREGG <br /> CPTSUMMi-1 20C-Rev 02-07-31 <br />