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CPT Interpretations L� U.Wt. Unit Weight of soil determined from: 1) uniform value or 2) value assigned to each SBT zone $) user supplied unit weight profile It -TStress~ Total vertical overburden stress at mid layer depth —�T --- TStress= y h 14 N where n is layer unit weight )�s � _._.._. ._._ ....___ �._ .__ �h;is layer thickness -- - !!!! EStress Effective vertical overburden stress at mid layer depth -EStress=TStress-Ueq iL Ueq Equilibrium pore pressure determined from: + I) hydrostatic from water table depth 2) user supplied profile } Cn SPT Neo overburden correction factor Cn=(a,) where OV is in tsf l 0.5<C„<2.0 I - N� SPT N value af60%energy calculated from Qt/N ratios assigned to 3 y each SBT zone• t i (41)60 SPT Neo value corrected for overburden pressure N1 so=Cn.Nw 3 4(N1)6o Equivalent Clean Sand Correction to(N1)eop(Nl), = I KK7 •(Nl)� 7 sPT ' I Where: KsPT is defined as: 0.0 for FC<5% 0.0167.(FC-5) for 5% <FC<35% if 0.5 for FC>35% r 4 FC-Fines Content in% (N1) I Equivalent Clean Sand(N1)so I (N1) =(NI)6o + 0(N1)so Su Undrained shear strength-Nkt is use selectableSu-Qt-av 2 u Nkr d • k I Coefficient of permeability(assigned to each SBT zone) _ - - _6 Bq Pore pressure parameter I eu 2 I_B4=Qt-QY_— - QtnV Normalized Qt for Soil Behavior Type classification as defined byJJ Qt'=Qt-ov -4 Robertson,1990 I Rfn - Normalized Rf for Soil Behavior Type classification as defined by o f 4 Rfn=100%• Robertson, 1990 Qt-Qv SBTn Normalized Soil Behavior Type(slightly modified from that published by 4 Robertson, 1990. This version includes all the soil zones of the original non-normalized SBT chart-see figure 1) y _ ._.._.— --__ __.._ _ . _._._._________.__._..._._____._______ Qct Norma—.lized Qtfor seismic._._._s__m_1c ._.analysis qct =qc•(Pa/a�')05 5 where: Pa=atm. pressure _..._t � _.. QcN __ Dimensionless;Normalized Qt1 qct N=qc1 /Pa i where: Pa=atm. pressure N RIEGG if I ' s i 1