Laserfiche WebLink
CPT Interpretations <br /> f Interpreted Description Equation Ref <br /> Parameter <br /> E.Stress <br /> 6v Effective vertical overburden stress at Mid Layer Depth Estress= Tstress-u,,q <br /> For hydrostatic option: <br /> Equilibrium pore pressure determined from one of the <br /> following user selectable options: uro=y,•(D-D,,,) <br /> Ueq where ueq 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 /> Dm is the depth to the water table <br /> Cn SPT Neo 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 4,5 <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 /> Neo(Ic) whereby the gt/N ratio varies across soil classification See Figure 1 5,$ <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 /> (N1)Oo I SPT Neo value corrected for overburden pressure I (N1)6o=Cn a Nro I 4 <br /> 4(N,),= KsPr o(Ni)(. <br /> Where: Ksp-r is defined as: <br /> A(N1)eo Equivalent Clean Sand Correction to(N1)8o 0.0 for FC<5% 4 <br /> 0.0167 o(FC-5) for 5%<FC<35% <br /> 0.5 for FC>35% <br /> FC-Fines Content in% <br /> (N1)e0c I Equivalent Clean Sand(141)so I (N1)eom=(N1)eo + &(N1)Bo 4 <br /> 4 Undrained shear strength-Nkt is user selectable I Srr=qt ,% <br /> Su <br /> l N 1,5 <br /> k Coefficient of permeability(assigned to each SBT zone) f 5 <br /> If Au <br /> Bq r <br /> q1-6" <br /> Bq Pore pressure parameter where: Qu=u_u 1.5 <br /> and u=dynamic pore pressure <br /> u.=equilibrium pore pressure <br /> Normalized qt for Soil Behavior Type classification as Q1-qt-Q" <br /> Qt I defined by Robertson, 1990 I 2,5 <br /> v <br /> Fr INormalized Friction Ratio for Soil Behavior Type Fr=100%o fs <br /> classification as defined by Robertson, 1990 I qt-Q" 2,5 <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 />