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CPT Interpretations Page 3/7 <br /> Interpreted Description Equation Ref <br /> Parameter <br /> AvgGamma Averaged Gamma Counts(iters data is not always available Av&�+=� GAMMA <br /> since it is a specialized test requiring an addrtional module) <br /> 0.1 <br /> n=1 when interpretations are done at each point <br /> SBT Sal Behavior Type as defined by Robertson and Campanella See Figure 1 2.5 <br /> SBTn Normalized Sal Behavior Type as defined by Robertson and <br /> See Figure 2 2,5 <br /> Campanella <br /> SBT-BQ Nor-normalized soil behavior type based on the Bq See Figure 5 7(reference 5) 2 5 <br /> parameter <br /> SBT-BQn Normalized Soil Behavior base on the Bq parameter See Figure 5 8(reference 5)or Figure 3(reference 2.5 <br /> k Coefirclent of permeability(assigned to each SBT zone) 5 <br /> Unit Weight of sal determined from one of the following user <br /> selectable options <br /> U Wt 1) uniform value See references 5 <br /> 2) value assigned to each SBT zone <br /> 3) user supplied unit weight profile <br /> T Stress <br /> Total vertical overburden stress at Mid Layer Depth 7-s&,'- y,h, <br /> A layer is defined as the averaging interval specified by the where ?r is layer unit weight <br /> 6v user For data interpreted at each point the Mrd Layer Depth hi is layer thickness <br /> is the same as the recorded depth <br /> For hydrostatic option <br /> Equilibrium pore pressure determined from one of the <br /> following user selectable options Yw=Y..(p—D. <br /> • Ueq where uq is equilibrium pore pressure <br /> 1) hydrostatic from water table depth y„Is unit weight of water <br /> 2) user supplied profile D is the current depth <br /> D,,,is the depth to the water table <br /> E Stress <br /> fav Effective vertical overburden stress at Mid Layer Depth <br /> Estress=Tsfress-uq <br /> Cn=(W5 <br /> Cn SPT Neo overburden correction factor where o;,'is in tsf <br /> 05<Q, 20 <br /> SPT N value at 60%energy calculated from gtlN ratios <br /> Neo assigned to each SBT zone This method has abrupt N See Figure f 4.5 <br /> value changes at zone boundaries <br /> (N,)m SPT N D value corrected for overburden pressure (N�w=Cn •Nw 4 <br /> N" SPT NOD values based on the Ic parameter (qt/pay No*=8 5(1 —Ic/4 6) 5 <br /> (N,)wIc SPT NOD value corrected for overburden pressure(using N� 1) (Ndw1c=Cn .(Nm1c) 4 <br /> ki User has 2 options 2) %,,. (Nd fc=8 5(1 —lc/4 6) 5 <br /> 1) (N,)Ic=a+4(N,Wfc) 10 <br /> 2) (N,)aoIc=Kspr'((Njwlc) 10 <br /> 3) qk,,,.y(N,"Ic=8 5(1 —Ic14 6) 5 <br /> (N,"Ic Clean sand equivalent SPT(N,)wlc User has 3 options FC=5% a=0 131=1 0 <br /> FC =35% a=50, 11=1 2 <br /> 5%<FC<35% a=exp[1 78—(1901FC)) <br /> 4=[0 99+(FC1S/1000)) <br /> ME <br /> CPTSUMM MethodsGV122a—Rev 01ir10-2004 <br />