Geoscience Reference
In-Depth Information
•
A non woven geotextile required in the applications of the table below.
Table 16.6
Geotextile robustness requirements for filters and drains (Austroads, 1990).
Application
Typical G rating
Typical minimum
mass (g/m
2
)
Subsoil drains and tenches
900
100
Filter beneath rock filled gabions,
1350
180
mattresses and drainage blankets
Geotextile reinforced chip seals
950
140
Figure 16.1
Strength and filtering requirements.
16.7 Geotextile durability for ground conditions and
construction equipment
•
The construction stresses are based on 150mm to 300mm initial lift thickness.
•
For lift thickness of:
-
300-450mm: Reduce Robustness requirement by 1 level.
-
450-600mm: Reduce Robustness requirement by 2 levels.
-
>
600mm: Reduce Robustness requirement by 3 levels.
•
The design requirements for bearing capacity failure must be separately checked.
•
The lift thickness suggests amaximumparticle size of 75mm to 150mm. Therefore
for boulder size fills (
>
200mm) the increased robustness is required.
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