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CPT Interpretations <br /> Ll <br /> Interpreted Description Equation Ref <br /> Parameter <br /> E.Stress <br /> 6v Effective vertical overburden stress at Mid Layer Depth Estress=Tstress-u. <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 u.q is equilibrium pore pressure <br /> 1) hydrostatic from water table depth yw is unit weight of water <br /> 2) user supplied profile D is the current depth <br /> D„o is the depth to the water table <br /> Cn=(6v)-0.s <br /> Cn SPT N60 overburden correction factor where a is in tsf <br /> 0.5<C„<2.0 <br /> SPT N value at 60%energy calculated from gtfN ratios <br /> Nsa assigned to each SST 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 /> N�(Ic) whereby the qt(N 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 /> Behavior Type Chart <br /> (Ni)w SPT NGQ value corrected for overburden pressure A)w=Cn.Neo I 4 <br /> A(M)"=1 KK •(NI)co <br /> Where: Ksar is defined as: <br /> a(N,)oo Equivalent Clean Sand Correction to(NI)Bo 4 <br /> 0.0 for FC<596 <br /> 0.0167•(FC-5) for 5%<FC<35% <br /> 0.5 for FC>35% <br /> FC-Fines Content in% <br /> (NI)m. Equivalent Clean Sand(N1)eo I (N1)a&:,=(N1)OO + o(N1)6o 4 <br /> Su Undrained shear strength-Nkt is user selectable 4 SU=qt " I 1,5 <br /> k Coefficient of permeability(assigned to each SBT zone) 1 5 <br /> Bq= Du <br /> qt—(T, <br /> Bq Pore pressure parameter where: 1,5 <br /> 4u=u--u,� <br /> and u=dynamic pore pressure <br /> u.q=equilibrium pone pressure <br /> Normalized qt for Soil Behavior Type classification as I Qt=qt a" <br /> Qt defined by Robertson, 1990 I a 2,5 <br /> Normalized Friction Ratio for Soil Behavior Type Fr=100%• fS I <br /> Fr classification as defined by Robertson, 1990 q —Cr" 2,5 <br /> SBTn Normalized Soil Behavior Type as defined by Robertson See Figure 2 2,5 <br /> and Campanella <br /> EGG <br /> CPTSUMM-1.20C-Rev.02-07-31 <br />