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CPT Interpretations <br /> Interpreted Description Equation Ref <br /> Parameter <br /> E Stress <br /> (7v Effective vertical overburden stress at Mid Layer Depth Estre$g= Tstress-u.q <br /> For hydrostatic option <br /> Equilibrium pore pressure determined from one of the <br /> following user selectable options 11,='Y.•(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,t is the depth to the water table <br /> Cn=(aj0 s <br /> Cn SPT No overburden correction factor where a„'is in tsf <br /> 05<CR<20 <br /> SPT N value at 60%energy calculated from gt1N ratios <br /> Neo 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 /> Neo(IC) whereby the gt1N ratio vanes across soil classification gee 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 /> (N,)eo SPT Neo value corrected for overburden pressure Aho=Cn -Nso 4 <br /> K <br /> Where KsaT is defined as <br /> A(N,)so Equivalent Clean Sand Correction to(Nj)eo 4 <br /> 0 0 for FC<5% <br /> 0 0167•(FC-5) for 5%<FC<35% <br /> 05 for FC>35% <br /> FC-Fines Content in% <br /> (Nj)eoc, Equivalent Clean Sand(Ni)eo (N1)ao.=(Ni)eo * A(N1)eo 4 <br /> Su Undrained shear strength-Nm is user selectable Su= N 1,5 <br /> ° <br /> k Coefficient of permeability(assigned to each SBT zone) 5 <br /> AU <br /> Bq qt-Q. <br /> Bq Pore pressure parameter where Au=u-u, 1,5 <br /> and u=dynamic pore pressure <br /> uq=equrkbnum pore pressure <br /> Normalized q,for Soil Behavior type dassifcation as 12t_qr 07, 2,5 <br /> at defined by Robertson, 1990 <br /> Normalized Fncbon Ratio for Soil Behavior Type Fr=1001/a• 13 <br /> 2,5 <br /> Fr classification as defined by Robertson, 1990 qr-6. <br /> S87rn Normalized Soil Behavior Type as defined by Robertson See Figure 2 2,5 <br /> and Campanella <br /> EGG <br /> CPTSUNFM-1 20C-Rev 02-07-31 � <br />