Geoscience Reference
In-Depth Information
•
Steeper slopes are possible, than those indicated.
•
Minimum width for maintenance and feasible for construction with heavy
earthmoving equipments
=
3.0m.
14.16 Slopes for revetments
•
Revetments are require to protect the slope against erosion, and based on the type
of material may govern the slope design.
•
Safety aspects may also influence the slope angle, e.g. adjacent to recreational
water bodies.
Table 14.16
Slopes for different revetment materials (McConnell, 1998).
Revetment type
Optimum slope
Maximum slope
Rip - Rap
1V: 3H
1V: 2H to 1V: 5H
Rock armour
1V: 1.5H
Concrete blocks
1V: 2.0H
Concrete mattresses
1V: 1.5H
Asphalt - OSA on LSA filter layer
1V: 3H
1V: 2.0H
Asphalt - OSA on geotextile anchored at top
1V: 1.5H
Asphalt - Mastic grout
1V: 1.5H
•
OSA - Open Stone Asphalt is a narrowly graded stone precoated with an asphalt
mastic, typically 80% aggregate (20-40mm) and 20% mastic.
•
LSA - Lean sand asphalt typically 96% sand and 4% bitumen 100 pen.
•
Mastic Grout is a mixture of sand, filler and bitumen, typically 60% sand, 20%
filler and 20% bitumen 100 pen.
Figure 14.3
Freeboard requirements.
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