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Stabilisation of a road embankment on very soft marine silts and clay, for the Beheith Military Road Project, Kuwait

 

Stabilization of a road embankment on very soft marine silts and clay

 

 

PRODUCTS:

TENAX LBO geogrids

 

Location - Date:

Beiheith Kuwait, 2001-2002

Owner:

State of Kuwait Ministry of Defence

Causeway project designer:

Tenax Spa Technical Office
Milan Italy

Main road project designer:

State of Kuwait Ministry of Defence, Military Eng. Projects

Contractor:

Bander & Faisal Al Masoud Kuwait

 

 

Problem
To enable The Ministry of Defence of The State of Kuwait to construct and operate a new coastguard station on the coast of northern Kuwait a road and causeway had to be constructed over very soft marine silts and clay, with CBR values of less that 0.5 this proved to be a challenging exercise both in terms of design and installation techniques.

Whenever a paved or unpaved road needs to be built on soft or saturated soil, settlement may take place during or after construction, with serious consequences for the life span of the road.

The base layer, made-up from granular material, can sink into the foundation soil, and horizontal and vertical movement capable of forming ruts can occur at the base.
To avoid these phenomena, it's necessary to place one or more layers of reinforcing geogrids having the ability to confine the aggregate and distribute the load.

The project was split into four separate areas: the main 9 km long access road; a man made island that would be used for the construction of the coastguard station; a 550 m long causeway linking the coastguard station with an offshore jetty and the installation of gabion mattresses on the shoulders of the slopes in the tidal areas.

 

Solution
The design carried out by Ministry of Defence Military Engineering Projects team required the inclusion of 1 layer of a 40 kNm x 40 kNm integral geogrid and one layer of a 20 kNm x 20 kNm integral geogrid in non tidal areas. In areas that would be affected both by high tides and the very low bearing capacity of the underlying soil conditions (CBR less than 2.0) two layers of the 40 kNm geogrid and one layer of the 20 kNm geogrid would be installed.

The contractor proposed TENAX LBO 440 SAMP and TENAX LBO 220 SAMP geogrids as being products that met the requirements of the design specification and the Ministry of Defence design team duly approved their use.

The man made island that would form the coastguard station and working area was constructed using 2 layers of TENAX LBO 440 SAMP geogrids and one layer of TENAX LBO 220 SAMP geogrid.

The contractor was responsible for the design and construction of the 550 m long causeway; the design was carried out on behalf of the contractor by the technical design office of TENAX SpA using the latest design software.

The 550 m long causeway, the height of which ranged from 1.7 m to 3.0 m, was to connect the man made island with the offshore jetty, the design allowed for settlement to take place during the construction phase to afford a stable roadway to enable the coastguard to access the jetty at all times. Due to the very low bearing capacity of the foundation soil it was clear during the construction of both the road, the man made island and the causeway that it would have been impossible to install either woven geogrids or geotextiles.

The gabion mattresses for the shoulders and side slopes were constructed from TENAX LBO 270 SAMP geogrids and installed in the tidal areas to help eliminate the erosive tidal effects that would occur in these areas. In all some 400,000 m2 of various grades of TENAX geogrids were installed.

 

Stabilization of a road embankment on very soft marine silts and clay

 

Stabilization of a road embankment on very soft marine silts and clay

 

Stabilization of a road embankment on very soft marine silts and clay

 

Stabilization of a road embankment on very soft marine silts and clay

 

 

 

 


Conclusions
The Kuwaiti Ministry of Defence design team and the contractor were pleased with both the efficiency of the product and the technical service supplied by TENAX.

Including TENAX LBO 440 SAMP geogrids, TENAX LBO 220 SAMP geogrids within the tidal area 9 km road with low CBR values, the man made island and the causeway and TENAX LBO 270 SAMP geogrids for the gabion mattresses allowed the engineers to:

  • Increase the bearing capacity of the subgrade;

  • Decrease the required thickness of the imported fill material without reduction in long term performances;

  • A reduction in construction time due to the ease of installation of TENAX LBO geogrids;

  • A reduction in cost due to the savings incurred in the reduction of the special fill material;

  • Construct a road in an area that would normally be inaccessible to vehicles;

  • Eliminate the erosive effect of the tidal flow on the embankments.

 

 

 

 

 

Applications:

arg Paved and unpaved roads

arg Foundations of roadbeds, embankments and earth dams

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