Laserfiche WebLink
CPT Interpretations <br /> Interpreted <br /> Parameter Description Equation Ref <br /> E Stress <br /> av Effective vertical overburden stress at Mid Layer Depth Estress= Tstress-u,w <br /> For hydrostatic option <br /> Equilibrium pore pressure determined from one of the <br />' following user selectable options u.,=y,.(D-D.) <br /> Ueq 1) hydrostatic from water table depth where uaq is equilibrium pore pressure <br /> 2) user supplied profile D is unit weight of water <br /> D is the current depth <br /> —Dm is the depth to the water table_ <br /> Cn=(rrv7 5 <br /> Cn SPT Ngo overburden correction factor where m'rs in tsf <br /> SPT N value at 60%energy calculated from gt1N rabos <br /> Nm 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 /> Nw(Ic) whereby the qt/N ratio varies across sod classifcabon <br /> zones based on the Ic parameter This techniques is See Figure 1 5, $ <br /> limited to zones 2 through 7 on the normalized Sod <br /> ___-- --- _Behavior Type <br /> (NI)m SPT Neo value corrected for overburden pressure (Nf)60=Cn •Neo 4 — <br /> r <br /> A(N�)eo=1 K� •(Ni)eo <br /> Where Ksar is defined as <br /> A(NOW Equivalent Clean Sand Correction to(Ni)Go 4 <br /> 0 Q for FC<5% <br />' 0 0167.(FC-5) for 5%<FC<35% <br /> 0 5 for FC>35% <br /> FC-Fines Content in% <br />' (Ni)wm Equivalent Clean Sand(Ni)ao -- (N1)w._=(N1)eo + A(N1)eo -- - ----- N _-4- <br /> - Su Undrained shear strength-Nw is user selectable f Su=qr -Qv <br /> k Coefficient of permeability(assigned to each SBT zone) w 5 <br /> r <br /> Bq Au <br /> = <br /> qr-Q. <br /> Bq Pore pressure parameter where Au=u-uw 1, 5 <br />' and u=dynamic pore pressure <br /> uq=equilibrium pore pressure <br /> Normalized qt for Soil Behavior Type classification as qi-or, - <br />' Qt _ defined by Robertson, 1990— - -----_.. _--- _ 2, 5 _ <br /> 6 <br /> Normalized Friction Ratio for Soil Behavior Type Fr=100%• A <br /> Fr classification as defined by Robertson, 1994 qi-Cr, _ 2, 5 <br /> rSBTn Normalized Sod Behavior Type as defined by Robertson — See Figure 2 2,5 <br /> and Campanella <br /> r <br /> GG <br />' CPTSUMM-1 20C-Rev 02-07-31 <br />