Four basic
functions are defined for the geotextile:
- 1. Filtration
- 2. Drainage
- 3. Separation
- 4. Reinforcement
1 . Filtration
Filtration functions to restrict the migration of fine soil
particles from a soil mass while remaining permeable to
water movement at least greater than, or equivalent to,
permeability of the protected soil.
2. Drainage
Water is conveyed along the plane of the geotextile due to its
construction, and then to an outlet. Water may be vertically
or horizontally conveyed. Drainage is related to the role of
filtration, and is a function of the permeability of a
geotextile and its pore opening size or porometry.
3. Separation
Separation is that function which prevents two distinct soils or different
materials from intermixing. The key factors for a geotextile
to satisfy this function are porometry, toughness and
strength.
4. Reinforcement
This function involves stabilization of a soil mass by
provision of tensile strength to the soil-fabric system.
To choose
the correct Geotextile, the diagram below indicates the
geotextile properties required :
FUNCTION
PROPERTIES REQUIRED
IN GEOTEXTILE
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