Geogrid layers during rock fill operation. The overall project required 700,000 m2 of TENAX LBO 303 SAMP
TENAX LBO bi-oriented geogrids
of Abu Dhabi
Emirate of Abu Dhabi Public Works
Ove Arup & Partners
Saif Bin Darwish Civil Engineering
In order to increase the traffic flow on the main highway
connecting the Emirate of Abu Dhabi with the Saudi Arabian
border, it was decided to widen the existing highway from
four to eight lanes.
Due to the poor underlying soil conditions and the cost
of importing engineered fill material the designers looked
at geotechnical solutions that would increase both the bearing
capacity of the subsoil and decrease the thickness of the
fill material, that would normally be required.
Due to the aggressive nature of the fill material the chosen
geosynthetic product had to demonstrate a high degree of
resistance to mechanical damage. The existing subgrade soil
was identified as a typical Subkha soil with a low bearing
capacity. To enable the project to be completed on time,
ease of installation was also of prime importance.
To stabilize the road embankments and to avoid differential
settlement, the consultant engineers opted for an integral
extruded PP geogrid offering both high junction strength
and resistance to mechanical damage. The same product has
been used also to reinforce and decrease the thickness of
imported fill of the slip roads.
As TENAX LBO 303 SAMP geogrids met in full the project and
design requirements, the product was proposed by the contractor
and approved by the engineers.
TENAX LBO 303 SAMP geogrids are specifically designed for
base reinforcement through uniform load distribution. The
geogrid reinforces the soil through two main mechanisms:
direct resistance to tensile stresses and interlocking,
which prevents any lateral movement of the soil.
To extend the road width, excavations were made on either
side of the existing road and TENAX LBO 303 SAMP geogrids
were installed at the base and special rock fill, between
0,25 m and 0,40 m thick depending on the area, was then
placed and compacted. For the slip roads TENAX LBO 303 SAMP
geogrids were installed for the full width of the new road
base, back filled and compacted with the special rock fill.
In total, in excess of 700,000 m2 of TENAX LBO 303 SAMP
geogrids were installed on the project.
Geogrid installation by easy unrolling and overlapping
TENAX geogrids rolls are 100 m long and are ideal for highway projects with all soil conditions
TENAX geogrids are design to interlock with large aggregate rock fill and do not suffer construction damages
The consultants and contractor were pleased with both the efficiency
of the product and the technical service supplied by TENAX. Working
to a very tight schedule, delivery and service was of prime importance
to the contractor.
TENAX set up an in-house logistics team working
in close contact with the contractor to ensure that all deliveries
were made on time. Including TENAX LBO 303 SAMP geogrids within
the design allowed the engineers to:
- Increase the bearing capacity of the Subkha subgrade;
- Decrease the required thickness of the special fill material
without reduction in long term performances;
- A reduction in construction time due to the ease of installation
of TENAX LBO 303 SAMP geogrids;
- A reduction in cost due to the savings incurred in the reduction
of the special fill material.