Geotextiles

BY:Karamat Ali Saif

Geotextile

Geotextiles are technical textiles designed for use in association with soil and for various civil engineering purposes serving the need for separation, filtration, reinforcement, protecting or drainage

Permeable fabrics which, when used in association with soil, have the ability to separate, filter, reinforce, protect, or drain.

Types of Geotextiles

Woven geotextilesAdvantages: High in Strength UV Resistant Rot Resistant Resists Biological Degradation Chemically Inert Increases the Life of Roads

Non woven geotextilesA non woven geotssextiles is ideal for use with roads, roofs, rail roads, ponds, dams, trenches and landfillsAdvantages:• 100% Propylene Staple Fibers• Needle-Punched• UV Resistant • Rot Resistant• Biological Degradation ResistantThere are two typesNeedle punched ( looks like felt)Heat bonded ( looks like ironed felt)

BASIC FUNCTIONS

Filtration Separation Reinforcement drainage•Filtration: Geotextiles act as filters between soil and drainage gravel, preventing soil particles from being carried away by the filtered water.

• Separation: Separation refers to the ability of geotextiles to prevent the mixing of two materials, such as a soft sub grade with a clean base aggregate • Reinforcement: Soil movement is reduced by the confinement and reinforcing action of geotextiles, which function by absorbing part of the stress that normally would cause shear failure • Drainage: The lengthwise permeability of the geotextiles allows it to perform as a drain. The amount of drainage is proportional to the thickness of the fabric

Civil engineering applications including roads, airfields, railroads, embankments, retaining structures, reservoirs, canals, dams, bank protection use Geotextiles as raw materials.

Geotextiles can improve soil strength at a lower cost than conventional soil nailing.

Application in Civil Engineering.

Geotextile in Bridges :

Transfers loads from metal arch to surrounding GRS mass No need for concrete footings or pile foundations Light weight and ships economically to site Low maintenance costs

Geotextiles replacing Hydroseeding

Hydroseeding is a process of planting grass that is fast, efficient and economical on sloppy surfaces where soil erosion is a major problem.Geotextiles are superior than hydroseeding• when the growing season is short and plants

cannot stabilize the slope quickly, • At high altitudes • where major storms are a frequent occurrence.

Thank you