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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 Estress=7stress-usq <br /> For hydrostatic option: <br /> ' Equilibrium pore pressure determined from one of the <br /> following user selectable options: U.=p„•(D-Dom,) <br /> Ueq where u.q is equilibrium pore pressure <br /> 1) hydrostatic from water table depth p,,,is unit weight of water <br /> 2) user supplied profile D is the current depth <br /> i ' Dwt is the depth to the water table <br /> i <br /> Cn=(a,,?" <br /> ' Cn SPT Nw overburden correction factor where a, is in tsf <br /> 0.5<Cn<2.0 <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 4,6 <br /> ' valve changes at zone boundaries. <br /> SPTN Value at 60%energy. This method is a slight <br /> modification of the Jefferies and Davies technique <br /> ' Neo(Ic) whereby the gtlN ratio varies 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 Soil <br /> i Behavior Type Chart <br /> (N,)eo I SPT Nan value corrected for overburden pressure (NI)w=Cn•Neo 4 <br /> 1 <br /> K <br /> A(NJ60= t X •(N060 <br /> svr <br /> Where: Ksr:r is defined as: <br /> n(Ni)eo Equivalent Clean Sand Correction to(Ni)eo 4 <br /> 9.0 for FC<5'/0 <br /> ' 0.0167.(FC-5) for 5%<FC<35% <br /> 0.5 for FC>35% <br /> FC-Fines Content in% <br /> ' (Nt)eo. Equivalent Clean Sand(Nt)ac (Ni)w,=(Ni)OO + A(Ni)eo 4 <br /> I <br /> Su I Undrained shear strength-Ne is user selectable Su=g —' I 1,5 <br /> 1 , <br /> k Coefficient of permeability(assigned to each SBT zone) 5 <br /> t Du <br /> Bq= <br /> 9t-6. <br /> Bq Pore pressure parameter where: Au=u_u, 1,5 <br /> ' and u=dynamic pore pressure <br /> u,q=equilibrium pare pressure <br /> Normalized qt for Sail Behavior Type classification as Qt 2,5 <br /> ' Qt defined by Robertson, 1990 a <br /> Normalized Friction Ratio for Soil Behavior Type Fr=tppoy, fS <br /> 2, 5 <br /> Fr I classification as defined by Robertson, 1990 qr-Q, <br /> ' SBTn Normalized Soil Behavior Type as defined by Robertson See Figure 2 2,5 <br /> and Campanella <br /> GREGG <br /> ' CPTSUMM-1.20C-Rev.02-07-31 � <br />