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' CPT Interpretations <br /> Interpreted <br /> Parameter Description Equation Ref <br /> E Stress <br /> Gv Effective vertical overburden stress at Mid Layer Depth Estress= Tsfress-u., <br />' For hydrostatic option <br /> Equilibrium pore pressure determined from one of the <br />' following user selectable options u„Q=y .(D-D_) <br /> Ueq i) hydrostatic from water table depth where u.,is equilibrium pore pressure <br /> 2) user supplied profile D is unit weightwater <br /> D is the current depth pthth <br />' Dwt is the depth to the water table <br /> Cn=(v„)-°5 <br />' Cn SPT N$o overburden correction factor where rr„'is in tsf <br /> QScCn<20 <br /> SPT N value at 60%energy calculated from qt/N ratios <br /> Nw assigned to each SBT zone This method has abrupt N See Figure 1 4,5 <br />' value changes at zone boundaries <br /> SPIN Value at 60%energy This method is a slight <br /> modification of the.leffenes and Davies technique <br />' <br /> whereby the gtIN ratio vanes across soil classification N60(IC) Se®Figure i 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)w I SPT NGO value corrected for overburden pressure (Ni}Bo=Cn .Nw I 4 <br /> 1 Ix� <br /> A(N,)� '(NI)60 <br /> A(NI)8oEquivalent Clean Sand Correction to(NI)60Where ICspr is defined as4 <br /> �0 for FC<5% <br /> 0 0167 a(FC-5) for 5%<FC c 35% <br /> 05 for FC?35% <br /> FC-Fines Content in% <br />' (Ni)oD. Equivalent Clean Sand(Ni)so (Ni)eocs=(N1)5D + 4(N1)ao 4 <br /> T, I <br /> Su Undrained shear strength-Nla is user selectable 1 Su=q� If 1,5 <br /> k I Coefficient of permeability(assigned to each SBT zone) I 5 <br /> Bq= Au <br /> qt-- <br /> 6. <br /> Bq Pore pressure parameter where1,5 <br /> Qu=u-u, <br /> and u=dynamic pore pressure <br /> uq=equilibnum pore pressure <br /> Normalized qt for Sod Behavior Type classification as Qi=qr-�• <br /> Qt defined by Robertson, 1990 • 2 5 <br /> a <br /> Normalized Fnction Ratio for Soil Behavior Type Fr=100%• fs <br /> Fr classification as defined by Robertson, 1990 qi- 2,5 <br /> I SBTn Normalized Soil Behavior Type as defined by Robertson gee Figure 2 2,5 <br /> and Campanella <br /> EGG <br /> CPTSUMM-1 20C-Rev 02-07-31 <br />