Friction (kpa) Cross correlation between qc qc & & fs fs
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1 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:. Cone Cone resisance Sleeve Sleeve fricion Pore Pore pressure Tip resisance (MPa), Fricion (kpa) Cross correlaion beween qc qc & & fs fs.,,, Pressure (kpa) The plo below presens he cross correlaion coeficien beween he raw qc and fs values (as measured on he field). X axes presens he lag disance (one lag is he disance beween wo sucessive CPT measuremens)., CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
2 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:. SBT - Bq plos, SBT SBT plo plo Bq Bq plo plo Cone resisance, qc/pa Correced cone resisance, q Pore pressure raio, Bq.... Fricion Raio, Rf (%) SBT legend. Sensiive fine grained. Organic maerial. o sily clay. ey sil o sily clay. Sily sand o sandy sil. Clean sand o sily sand. Gravely sand o sand. Very siff sand o clayey sand. Very siff fine grained CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
3 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:. SBT - Bq plos (normalized), SBTn SBTn plo plo, Normalized Bq plo Bq plo Normalized Cone Resisance, Qn Normalized cone resisance, Qn Pore pressure raio, Bq.... Normalized Fricion Raio, Fr (%) SBTn legend. Sensiive fine grained. Organic maerial. o sily clay. ey sil o sily clay. Sily sand o sandy sil. Clean sand o sily sand. Gravely sand o sand. Very siff sand o clayey sand. Very siff fine grained CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
4 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:. Bq plos (Schneider) Schneider e al e () al () Soil Soil Class. Class. Schneider e al e () al () Soil Soil Class. Class.,, Essenialy Drained Sands Essenialy Drained Sands Q = qcne/sig'v Transiional Soils a Sils and "Low Ir" s b s Sensiive s c Q = qcne/sig'v Transiional Soils a Sils and "Low Ir" s b c s Sensiive s - - Du/sig'v. Du/sig'v CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
5 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:. Norm. Norm. Soil Soil Behaviour Type Type Sand Very dense/siff soil SBTn (Roberson ) CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
6 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:. Cone Cone resisance q q Fricion raio raio Pore Pore pressure u u SBT SBT Index Index Soil Soil Behaviour Type Type Tip resisance (MPa) Rf (%),, Pressure (kpa) I(SBT) SBT legend. Sensiive fine grained. Organic maerial. o sily clay. ey sil o sily clay. Sily sand o sandy sil. Clean sand o sily sand SBT (Roberson, ). Gravely sand o sand. Very siff sand o clayey sand. Very siff fine grained CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
7 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:. Norm. Norm. cone cone resisance Qn Norm. Norm. fricion raio raio Fr (%) Norm. Norm. pore pore pressure raio raio Bq. SBTn SBTn Index Index SBTn legend Ic. Sensiive fine grained. Organic maerial. o sily clay Norm. Norm. Soil Soil Behaviour Type Type. ey sil o sily clay. Sily sand o sandy sil. Clean sand o sily sand Sand SBTn (Roberson ). Gravely sand o sand. Very siff sand o clayey sand. Very siff fine grained CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
8 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:. Permeabiliy SPT SPT N N Young's modulus Relaive densiy Fricion angle angle - x - - x x Ksb (m/s) N (blows/cm) Es (MPa) Dr (%) φ (degrees) Calculaion parameers Permeabiliy: Based on SBT n SPT N : Based on I c and q Young s modulus: Based on variable alpha using I c (Roberson, ) Relaive desnisy consan, C Dr:. Phi: Based on Kulhawy & Mayne () User defined esimaion daa CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
9 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:. Consrained Modulus Shear Shear modulus Shear Shear srengh Su peak Su remolded Undrained srengh raio raio OCR OCR M(CPT) (MPa) Go (MPa), Su (kpa),. Su/σ',v. OCR Calculaion parameers Consrained modulus: Based on variable alpha using I c and Q n (Roberson, ) Go: Based on variable alpha using I c (Roberson, ) Undrained shear srengh cone facor for clays, N k: OCR facor for clays, N k:. User defined esimaion daa CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
10 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:. Shear Shear Wave Wave velociy Sae Sae parameer In-siu sress sress raio raio Soil Soil sensiiviy Effecive fricion angle angle Vs (m/s) -. ψ -. Ko S Peak φ (degrees) Calculaion parameers Soil Sensiiviy facor, N S:. User defined esimaion daa CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
11 CPT: CPT- Toal deph:. m, Dae: -- Surface Elevaion:. m Coords: X:., Y:., Bearing Bearing Capaciy Capaciy Plo Plo,,,, Bearing Capaciy calculaion is perfromed based on he formula: Q = R q + q ul k soil Ulimae Bearing Capaciy (kpa),,,,,,,,,,,,,, where: R k: Bearing capaciy facor q : Average correced cone resisance over calculaion deph q soil: Pressure applied by soil above fooing,,, Fooing Widh (m) :: Tabular resuls :: No B (m) Sar Deph (m) End Deph (m) Ave. q (MPa) R k Soil Press. (kpa) Ul. bearing cap. (kpa) CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
12 This sofware is licensed o: Gregg Drilling & Tesing, Inc. Presened below is a lis of formulas used for he esimaion of various soil properies. The formulas are presened in SI uni sysem and assume ha all componens are expressed in he same unis. :: Uni Weigh, g (kn/m³) :: q g= gw. log(r f ) +. log( ) +. p a where g = waer uni weigh :: Permeabiliy, k (m/s) :: I I.-. I c c <. and Ic >. hen k = -.-. I c c. and Ic >. hen k= :: N SPT (blows per cm) :: qc N =.. I P c a N( ) = Qn.. I c :: Young's Modulus, Es (MPa) :: (q σ ). v. Ic+. (applicable only o I c < I c_cuoff) :: Relaive Densiy, Dr (%) :: Q k n DR :: Sae Parameer, ψ :: ψ=.. log(q (applicable only o SBT n:,, and or I c < I c_cuoff) n, cs :: Peak drained fricion angle, φ ( ) :: φ=.+ log(q (applicable only o SBT n:,, and ) :: -D consrained modulus, M (MPa) :: If I M c α= for Q α= Q CPT >. n w n for Q > n = α (q σ ) v n ) ) :: Small srain shear Modulus, Go (MPa) :: G = (q σ ). v. Ic+. :: Shear Wave Velociy, Vs (m/s) :: G Vs ρ =. :: Undrained peak shear srengh, Su (kpa) :: N S k u =. + log(f ) or user defined = ( q σ ) N k v :: Overconsolidaion Raio, OCR ::. Q n k OCR=. (. + log(f r )) OCR= k Q OCR n r (applicable only o SBT n:,,, and or I c > I c_cuoff) :: Remolded undrained shear srengh, Su(rem) (kpa) :: S u( rem) = fs (applicable only o SBT n:,,, and or I c > I c_cuoff). or user defined (applicable only o SBT n:,,, and or I c > I c_cuoff) :: In siu Sress Raio, Ko :: K O = ( sinϕ ') OCR :: Soil Sensiiviy, S :: N S = F S r sinϕ ' (applicable only o SBT n:,,, and or I c > I c_cuoff) (applicable only o SBT n:,,, and or I c > I c_cuoff) :: Effecive Sress Fricion Angle, φ ' ( ) :: '. q (.+. B logq ) φ =. B + (applicable for.<b q<.) q If I M c CPT. = (q σ ). v. I c+. References Roberson, P.K., Cabal K.L., Guide o Cone Peneraion Tesing for Geoechnical Engineering, Gregg Drilling & Tesing, Inc., h Ediion, November Roberson, P.K., Inerpreaion of Cone Peneraion Tess - a unified approach., Can. Geoech. J. (): () CPeT-IT v... - CPTU daa presenaion & inerpreaion sofware - Repor creaed on: --, ::
CPT: Geopractica Contracting (Pty) Ltd Total depth: m, Date:
The plot below presents the cross correlation coeficient between the raw qc and fs values (as measured on the field). X axes presents the lag distance (one lag is the distance between two sucessive CPT
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