Geoscience Reference
In-Depth Information
Table 9.14
Likely shear strength of intact fresh to slightly weathered rock.
Origin
Grain type
Rock Type
Shear strength
Cohesion (MPa)
Friction angle
◦
Sedimentary
Rudaceous (
2 mm)
Clastic
30
45
>
Chemically formed
20
40
Organic remains
10
40
Arenaceous (0.06-2 mm)
Clastic
15
35
Chemically formed
10
35
Organic remains
5
35
Argillaceous (
2 mm)
Clastic
5
25
>
Chemically formed
2
30
Organic remains
1
30
Metamorphic
Coarse
foliated
20
35
Non-foliated
30
40
Medium
Foliated
10
30
Non-foliated
15
35
Fine
Foliated
2
25
Non-foliated
5
30
Igneous
Coarse (large intrusions)
Pyroclastic
20
40
Non pyroclastic
40
50
Medium (small intrusions)
Pyroclastic
10
35
Non pyroclastic
30
45
Fine (extrusions)
Pyroclastic
5
30
Non pyroclastic
20
40
Figure 9.2
Variation of rock strength for various geological conditions (TRB, 1996).
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