Laserfiche WebLink
CPT Interpretations <br /> Interpreted Description Equation Ref <br /> Parameter <br /> qcl <br /> qt normalized for overburden stress used for seismic q,:, —q'•(Pa/6") <br /> analysis where: Pa=atm. Pressure 3 <br /> q,is in MPa <br /> gcfN q,-,N=qc,1 Pa <br /> qe, in dimensionless form used for seismic analysis 3 <br /> where: Pa=atm.pressure <br /> . t <br /> Kc= 1.0 for/,—<1.64 <br /> Kc Equivalent clean sand correction for qdN Ke=f(Ij for!c> 1.64 (see reference) 3 <br /> 1{�= 1.Ofor 1.64<le<2.38andFc<0.5% f <br /> gc,Ncs Clean Sand equivalent qc,N 1 gc,Aa==Qc,N•Kc { 3 <br /> Ic=[(3.47--16g,oQ)2+(log,o Fr+1.22)Z)vs tt <br /> Where: (qt-07.uP.)" <br /> P,: )It�•J <br /> le Soil index for estimating grain characteristics And Fr is in percent 3,8 <br /> P.=atmospheric pressure <br /> Pae=atmospheric pressure <br /> n varies from 0.5 to 1.0 and is <br /> selected in an iterative manner based on the <br /> resulting 1c <br /> FC=1.75(lc3.2s)-3.7 <br /> FC Apparent fines content(%} FC=100 fork>3.5 3 <br /> FC=O for lc< 1.26 <br /> ` FC=5%if 1.64<!c<2.6 AND F,<0.5 <br /> Ic< 1.31 Zone=7 <br /> This parameter is the Soil Behavior Type zone based on 1.31 <Ic<2.05 Zone=6 <br /> ' is Zone the Ic parameter(valid for zones 2 through 7 on SBTn 2.05<Ic<2.60 Zone=5 3 <br /> 2.60<Ic<2.95 Zone=4 <br /> chart) 2.95<lc<3.60 Zone=3 <br /> Ic>3.60 Zone=2 <br /> Friction Angle determined from one of the following user <br /> selectable options: <br /> PHI <br /> 5 <br /> a) Campanella and Robertson See reference <br /> b) Durgunoglu and Mitchel- <br /> c) Janbu <br /> Relative Density determined from one of the following user <br /> selectable options: <br /> Dr a)Ticino Sand See reference 5 <br /> b) Hokksund Sand <br /> c)Schmertmann 1976 <br /> d)Jam iolkowski-All Sands <br /> a)Based on Schmertmann's method involving a <br /> plot of S„la,;l(Sja6')Kc and OCR. <br /> OCR Over Consolidation Ratio—2 methods available b)Based onrqr—Q.} 5 <br /> OCR=K• JI <br /> 6. <br /> where an average value of k=0.3 is used <br /> State The state parameter is used to describe whether a soil is <br /> Parameter contractive(SP is positive)or dilative(SP Is negative)at See reference 9, 7,5 <br /> large strains based on the work by Been and Jefferies <br /> GREGO <br /> CPTSl1MM-1.20C—Rev.02-07-31 <br />