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CPT Interpretations U Wt- Und Weight of soil determsned from 1) uniform value or 2) value assigned to each SBT zone 3) user supplied unit weight profile TStress Total vertical overburden stress at mrd layer depth --- --v- -- - TStress 4 y,h, ---- - where rs layer unit weight A is tayer thicluiess EStress Effective vertical overburden stress at mid layer depth - EStress=TStress-Ueq Ueq Equilibnum pone pressure determined from - - - - - 1) hydrostatic from water table depth 2) user supplied profile , Cn SPT No overburden correction factor - where ay'+s in tsf 05<C„<20 No SPT N value at 60%energy calculated from Qt/N radios assigned to each 3- SBT zone (N1)ao SPT No value corrected for overburden pressure NIw=Cn•Neo 3 d(Ni)so Equivalent Clean Sand Correction to(N1)�e 4(NI Kms.(N1)" 7 t-Ksrr Where Kswr is defined as 00 for FC<5% 0 0167.(FC-5) for 5%<FC<35% 05 for FC?35% FC-Fines Content in% (Nt)%c" Equnralent Clean Sand(N1)go (N1)beR=(NI),, + e(N1),e ----_ 7 - Su tJndraned shear strength-Nkt is use selectable - - - 4 - - - -Su Qt--a, - - ------ - 2 = ---- Nxr k Coeffrcment of permeabdit}r(assigned to each-5&f zone) - - -- 6-- Bq Pone pressure parameter - __Qu 2 _ _ Bq Qr-a, Qin Norrnalize-d Qt for soil Behavior Type classification as defined by - �,�-Qr-er. - - -- -�- 4 Robertson.1990 a Rfn Normalized Rf for Sal Behavior Type classif'ica ion as defined byj- - -- �� 4- Robertson,1990 �=1 W1, - l - Qt-a, SBTn Nommal¢ed Sal 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) Qct Normalized Qt for seismic analysis qct=qc-(Pa1a„')e s _ 5 where Pa=ati n.pressure Qc1N Oimensionless NormarizedQtl gc1N=qci I Pa where. Pa=atm pressure CtC EC 4ttiwtttltt�