Geoscience Reference
In-Depth Information
Figure 5.4
CPT properties, and strength changes for electrical cones (Robertson and Campanella,
1983).
5.15 Clay strength from cone penetration tests
•
The table below uses the above relationships to establish the clay likely strength.
Table 5.15
Soil strength from cone penetration test.
Soil classification
Approximate q
c
(MPa)
Assumptions. Not corrected for overburden.
V. Soft
C
u
=
0-12 kPa
<
0.2
N
k
=
17 (Normally consolidated)
Soft
C
u
12-25 kPa
0.2-0.4
N
k
17 (Normally consolidated)
=
=
Firm
C
u
25-50 kPa
0.4-0.9
N
k
18 (Lightly overconsolidated)
=
=
Stiff
C
u
=
50-100 kPa
0.9-2.0
N
k
=
18 (Lightly overconsolidated)
V. Stiff
C
u
100-200 kPa
2.0-4.2
N
k
19 (Overconsolidated)
=
=
Hard
C
u
=
>
200 kPa
>
4.0
N
k
=
20 (Overconsolidated)
5.16 Simplified sand strength assessment from cone
penetration tests
•
A simplified version is presented below for a preliminary assessment of soil strength
in coarse grained material.
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