SEA WALL
(Madurai- Dhanushkodi Road –NH49)
GABION BOX
SEA WALL
(Madurai- Dhanushkodi Road –NH49)
SEA WALL
(Madurai- Dhanushkodi Road –NH49)
SEA WALL
(Madurai- Dhanushkodi Road –NH49)
SEA WALL
(Madurai- Dhanushkodi Road –NH49)
SEA WALL
(Madurai- Dhanushkodi Road –NH49)
SEA WALL
(Madurai- Dhanushkodi Road –NH49)
SEA WALL
(Madurai- Dhanushkodi Road –NH49)
SEA WALL
(Madurai- Dhanushkodi Road –NH49)
Applications of Geosynthetics in
National Highways Project
1.Construction of Sea wall in MaduraiDhanushkodi Road-(NH-49)
Construction Method
The sea wall is constructed to avoid erosion
of the existing road with the following provisions.
GEO TEXTILE LAYER
Geotextile layer is spread on the sloped ground.
Filter layer of 30 cm thick using granite stones is laid
over Geotextile grid (made up of polypropylene
polymer) to a length of 18m perpendicular to the
road.
Core layer of 50cm thick using granite stones
weighing 50kg-125kg is laid.
Over that, Armour layer of 100cm thick using the
Granite stones weighing 400kg-500kg is laid.
Gabion Boxes of size 1.0x1.0x1.0m is placed at the
toe (sea side). This Gabion box is manufactured
using 9mm dia polypropylene rope 4 strand
woven joint.
Gabion Box of size 1.0mx1.0mx1.0m and
0.5mx0.5mx0.5m is placed on the top of wall to
break the high tides if any.
2.Construction of abandoned stretch of NH
49 for 5.0km Length(km183/2-188/2)
Marooned city
• About 5km road is completely washed away
in 1964 cyclone.
The entire town
Dhanushkodi was totally marooned. only the
head post office and the church were left as
the monuments. No habitations there upto
1990.
 There after, day by day people and
fishermen started living at Dhanushkodi
and they are using the four wheeler
jeeps and van to travel on the sandy bed.
Dhanushkodi is the only holy place in south india
and people are performing the last rites of their
deceased parents.
 Hence, it is highly necessitated to reconstruct the
missing link of 5.0km length.
Gabion boxes as shown in the picture are provided
on both sides of the embankment.
Geotextile layer is placed on the inner side of the
gabion boxes to avoid the sea water entering into
the pavement.
This geotex layer also protect the pavement from
the tidal actions.