Eurocodice (EN 1997) > EN 1997 - 2 > Content of Eurocode 7-2 > Field tests in soil and rock

Annex D.1

Table D.1: Effective angle of shearing resistance (phi’) and drained Young’s modulus of elasticity (E’) from cone penetration resistance (qc)

Density index	Cone resistance (qc) (from CPT)	Effective angle of shearing resistancea, phi [°]	Drained Young's modulusb, (E') [MPa]
Very loose Loose Medium dense Dense Very dense	0.0 - 2.5 2.5 - 5.0 5.0 - 10.0 10.0 - 20.0 >20.0	29 - 32 32 - 35 35 - 37 37 - 40 40 - 42	<10 10 - 20 20 - 30 30 - 60 60 - 90

Density index

Cone resistance (qc) (from CPT)

Effective angle of shearing resistancea, phi [°]

Drained Young's modulusb, (E') [MPa]

Very loose

Loose

Medium dense

Dense

Very dense

0.0 - 2.5

2.5 - 5.0

5.0 - 10.0

10.0 - 20.0

>20.0

29 - 32

32 - 35

35 - 37

37 - 40

40 - 42

<10

10 - 20

20 - 30

30 - 60

60 - 90

a Values given are valid for sands. For silty soil a reduction of 3° should be made. For gravels 2° should be added.

b E' is an approximation to the stress and time dependent secant modulus. Values given for the drained modulus correspond to settlements for 10 years. They are obtained assuming that the vertical stress distribution follows the 2:1 approximation.