Geoscience Reference
In-Depth Information
Figure 20.4
Location of potential failure surfaces.
20.10 Sacrificial thickness for metallic reinforcement
•
A sacrificial thickness needs to be applied for corrosion protection with metallic
soil reinforcement.
Table 20.10
Sacrificial thickness for reinforcing strips (Schlosser and Bastick, 1991).
Type of steel
Environment
Sacrificial thickness (mm) for minimum service life (yrs)
5 yrs
30 yrs
70 yrs
100 yrs
Black steel
Out of water
0.5
1.5
3.0
4.0
Fresh water
0.5
2.0
4.0
5.0
Coastal structure
1.0
3.0
5.0
7.0
Galvanised steel
Out of water
0
0.5
1.0
1.5
Fresh water
0
1.0
1.5
2.0
Coastal structure
0
N/A
N/A
N/A
20.11 Reinforced slopes factors of safety
•
Different factors of safety are calculated depending on whether the soil rein-
forcement is considered an additional reducing moment or an reduction to the
overturning moments.
•
Both are valid limit equilibrium equations.
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