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Correlation Coefficients for Evaluating of Bearing Capacity of Piles from CPTs

Correlation coefficients ξ for evaluating of bearing capacity from CPTs (n - number of CPTs)

ξ for n =

1

2

3

4

5

7

10

ξ3

1.40

1.35

1.33

1.31

1.29

1.27

1.25

ξ4

1.40

1.27

1.23

1.20

1.15

1.12

1.08

For the NBN EN 1997-1 ABN standard, the correlation coefficients are defined according to the density of CPTs on the construction site.

The coefficient ξ3 is taken as follows:

NUMBER OF PILES

CPT DENSITY

1 CPT per 10 m2

1 CPT per 50 m2

1 CPT per 100 m2

1 CPT per 300 m2

1 CPT per 1000 m2

1-3

1,25

1,29

1,32

1,36

1,40

4-10

1,15

1,19

1,21

1,25

1,29

> 10

1,14

1,17

1,20

1,24

1,27

The coefficient ξ4 is taken as follows:

NUMBER OF PILES

CPT DENSITY

1 CPT per 10 m2

1 CPT per 50 m2

1 CPT per 100 m2

1 CPT per 300 m2

1 CPT per 1000 m2

1-3

1,08

1,17

1,23

1,31

1,40

4-10

1,00

1,07

1,13

1,21

1,29

> 10

1,00

1,06

1,12

1,20

1,27

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