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y r <br /> CPT Interpretations <br /> Interpreted Description Equation Ref <br /> Parameter <br /> E Stress <br /> (Ty Effective vertical overburden stress at Mid Layer Depth Estress= Tstress-ueq <br /> For hydrostatic option <br /> Equilibrium pore pressure determined from one of the <br /> following user selectable options u,=r„•(D-D j <br /> Ueq where uq 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 /> Dwt is the depth to the water table <br /> Cn SPT Neo overburden correction factor where vV is in tsf <br /> 05<C„<20 <br /> — SPT N value at 60%energy calculated from gt1N ratios <br /> Ngo 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 Jeffenes and Davies technique <br /> Ngo(lc) whereby the gt1N 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 Soil <br /> Behavior Type Chart -- <br /> (Nt)Bo SPT Neo value corrected for overburden pressure I (N,)6=Cn •N60 -I 4 <br /> KKaOV06. <br /> sir <br /> Where Ksar is defined as <br /> o(N,)eo Equivalent Clean Sand Correction to(N1)eo 4 <br /> 0 0 for FCS 5% <br /> 0 0167 a(FC-5) for 5%< FC<35% <br /> 05 for FC>35% <br /> FC-Fines Content in% <br /> (Ni)ea� Equivalent Clean Sand(NOeso I (N1)eocs= (N1)go + A(N1)eo 4- <br /> t <br /> - Su Undrained shear strength-Nkt is user selectable Su= q Cr Y 1 5- <br /> 1 N,, <br /> k I Coefficient of permeability(assigned to each SBT zone) <br /> Bq <br /> Au <br /> = <br /> qi-Q <br /> Bq Pore pressure parameter where Du=u_u, 1 5 "I <br /> and u=dynamic pore pressure <br /> ueq=equilibrium pore pressure <br /> 2 5 <br /> Normalized qt for Soil Behavior Type classification as Ot=qt-6 <br /> Qi defined by Robertson 1990 Cr <br /> F, INormalized Friction Ratio for Sod Behavior Type Fr=100%+ fs 2, 5 <br /> classification as defined by Robertson 1990 I qi-6 <br /> SBTn Normalized Soil Behavior Type as defined by Robertson See Figure 2 2 5 <br /> and Campanella <br /> GREGO <br /> CPTSUMM-1 20C-Rev 02-07-31 <br />