Laserfiche WebLink
Gregg CPT Interpretation Software 1.1., 2007 <br />8 Friction Ratio, Rf (%)Rr = (fAO x 100% <br />9 Soil Behavior Type (non-normalized), SBT see note <br />10 Unit weight, y (pcfor kN/mb based on SBT, see note <br />11 Total overburden stress, av (tsf)avo=yz <br />12 Insitu pore pressure, uo (tsf)uo=yw (z-Zw) <br />13 Effective overburden stress, a'vo (tsf)cy'vo = avo - uo <br />14 Normalized cone resistance, Qu Q,i= (qt - avo) / a'vo <br />15 Normalized friction ratio, Fr (%)Fr = fs/(qt - avo) x 100% <br />16 Normalized Pore Pressure ratio, Bq Bq= u -Uo/(qi- avo) <br />17 Soil Behavior Type (normalized), SBTn see note <br />18 SBTn Index, Ic see note <br />19 Normalized Cone resistance, Qtn (n varies with [c) see note <br />20 Estimated permeability, kgm (cm/sec or ft/sec) see note <br />21 Equivalent SPT N6O, blows/ft see note <br />22 Equivalent SPT (Ni)60 blows/ft see note <br />23 Estimated Relative Density, Dr, ('A)see note <br />24 Estimated Friction Angle, 44 (degrees)see note <br />25 Estimated Young's modulus, Es (tsf)see note <br />26 Estimated small strain Shear modulus, Go (tsf) see note <br />27 Estimated Undrained shear strength, su (tsf)see note <br />28 Estimated Undrained strength ratio Su/Gv' <br />29 Estimated Over Consolidation ratio, OCR see note <br />Notes: <br />1 Soil Behavior Type (non-normalized), SBT Lunne et at. (1997) <br />listed below <br />2 Unit weight, y either constant at 119 pcfor based on Non-normalized SBT <br />(Lunne et al., 1997 and table below) <br />3 Soil Behavior Type (Normalized), SBTn Lunne et al. (1997) <br />4 SBTn Index, Ic 4 = ((3.47 - log Qi,)2 + (log Fr + 1.22)2)05 <br />5 Normalized Cone resistance, Qm (n varies with Ic) <br />Qtn = «q, - ave)/pa) (pa/(a'vor and recalculate Ic, then iterate: <br />When 4 < 1.64,n = 0.5 (clean sand) <br />When Ic> 3.30,n = 1.0 (clays) <br />When 1.64 < Ic < 3.30, n = (Ic - 1.64)0.3 + 0.5 <br />Iterate until the change in n, An < 0.01 <br />Gregg Page 2 of4 8./28/2007