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CPT Interpretations <br /> Interpreted Description Equation Ref <br /> Parameter <br /> E Stress <br /> av Effective vertical overburden stress at Mid Layer Depth Estress=Tsfress-uq <br />' <br /> Equilibrium pore pressure determined from one of the For hydrostatic option <br /> following user selectable options d.,=r„•(D-D.,) <br /> Ueq where uq is equilibrium pone 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 /> ID,,,,t is the depth to the water table <br /> Cn=(a,,)-0 a <br /> I Cn SPT Neo overburden correction factor where a,'is in tsf <br /> 05<Cn<20 <br /> SPT N value at 60%energy calculated from qt/N ratios <br /> NBO 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 /> whereby the gt1N ratio vanes across soil classification <br /> Ne°(ic) zones based on the Ic parameter This techniques is See Figure ? 5 8 <br /> limited to zones 2 through 7 on the normalized Soil <br /> Behavior Type Chart <br /> (NI)eo ! SPT Neo value corrected for overburden pressure I (NI)60=Cn.N6o 4 <br /> K <br /> A(NO. l-K �(NI)6G <br /> sPr <br /> I. Where ICsar is defined as <br /> A(Nl)eo Equivalent Clean Sand Correction to(Ni)an 4 <br /> 0 0 for FC<5% <br /> I <br /> 00167*(FC-5) for 5%<FC<35% <br /> 0 5 for FC>35% <br /> FC-Fines Content in% <br /> I (Nt)eo. I Equivalent Clean Sand(NI)ao I (N1)eoR=(N1)6o + A(N1)en I 4 <br /> Su Undrained shear strength-Nin is user selectable I S.=9�" I 1 5 <br /> k i Coefficient of permeability(assigned to each SBT zone) I I 5 <br /> AU <br /> Bq= <br /> 4t-Cr. <br /> Bq Pore pressure parameter where Au=o-uw 1,5 <br /> and u=dynamic pore pressure <br /> u.,=equilibrium pons pressure <br /> Normalized t for Sod Behavior Type classification as 9t 6• <br /> No <br /> q YP I Qt= 2, 5 <br /> Qt defined by Robertson, 1990 rr <br /> 111 fs <br /> Normalized Friction Ratio for Sod Behavior TypeI Fr=100%• I 2,5 <br /> F{ classification as defined by Robertson, 1990 qr-6. <br /> I SBTn Normalized Soil Behavior Type as defined by Robertson See Figure 2 2,5 <br /> and Campanella <br /> QREGG <br /> CPT5tJMM-1 20C-Rev 02-07-31 <br />