Geotextile is a porous and permittable textile material which is used in contact with rock, earth, soil and etc as an vital part of civil engineering projects and structures. It can be of naturally found substances like cotton, jute and coir. It can also be synthetic polymers like polyamide, polypropylene, polyethylene, and polyester.

Functions of Geotextiles

• Sealing
• Drainage
• Reinforcement
• Separation
• Filtration

Sealing

 

Drainage/ Filtration/ Transitivity

Reinforcement

By giving lateral pressure through interfacial abrasion between soil and geotextile

Properties of Design

• Burst power
• Puncture strength
• Permeability
• Gab tensile power and enlongation
• Dynamic puncture

Applications of Design

• Drainage
• Pavement overlays
• Flexible paved road construction

 

1. Flexible paved road construction

Fig: table showing prerequisites for roadways application

PROPERTY	UNIT	REQUIREMNTS
MODERATE	HIGH
Puncture Strength	N	400	700
Dynamic Puncture	m	0.018	0.012
Ultimate elongation	%	>50	>50
Burst Strength	Pa	2	3
Grab Strength	N	700	800
Permeability	m/s	>Soil Permeability
Apparent Opening size	m	< .00015

 

 

2. Pavement Overlays

Fig: Table showing Paving Fabric Requirements

PROPERTY	UNITS	REQUIREMENTS
Grab Strength	N	450
Mass per Unit area	Kg/m2	.140
Ultimate Elongation	%`	> 50
Melting point	0C	150

 

 

3. Drainage

Fig: table showing prerequisites for drainage applications

Property	Unit	High survivability	Moderate survivability
Puncture Strength	N	690	420	260
Dynamic Puncture	m	.014	.018	.022
Burst Strength	Pa	2757600	2068200	1275390
Elongation at break	%	60	60	60

 

• Geotextiles are competent, effective and economic technique of resolving most of the geotechnical tribulations in roadways.
• The design engineer has to be well informed about the potential problems and must make use of this fairly new tool for resolving them.
• For this he should comprehend the properties and abilities of geotextile matierial at disposal.

 

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