Soil Stabilization – using Fibertex Geotextiles

Soil Stabilization – using Fibertex Geotextiles

Motorway M7 in Hungary - M7 Ordacsehi-Balatonkeresztúr section | Fibertex Nonwovens A/S

The project:

  • 25,7 km motorway section on soils with very low bearing capacity
  • Construction of a 9-11m embankment to carry the motorway.
  • 1,2 million m2 of Fibertex Geotextiles was installed in combination with geogrid to stabilize the subsoil

 

The motorway M7 from Budapest to Croatia in the western region of Lake Balaton had to be constructed over thick peat layers with very low bearing capacity.

The peat layers were typically 3–4m deep, but in some areas as much as 6-8m deep. The underground water level was close to the ground surface. The expected settlement of the embankment was 70 cm on the average, but in some places up to 100 cm. The height of the embankment was 9-11m.

Key soil figures: Top soil removal 186,960 m3, base of the embankment 526,985 m3, embankment 2,943.945 m3 and dynamic soil exchange 281,563 m3.

 

The Fibertex solution:

To stabilize the soft subsoil, Fibertex Geotextiles were installed between the construction layers as a separator. On extremely poor subsoil, Fibertex Geotextiles were used in combination with geogrid. In total 1.2 million m2 of Fibertex Geotextiles were installed and 500,000 m2 geogrid.

 

Motorway M7 in Hungary - M7 Ordacsehi-Balatonkeresztúr section | Fibertex Nonwovens A/S

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Geotextile functions:

To stabilize the subbase and improve the bearing capactiy of the subsoil a geotextile is placed between the construction layers to prevent mingling and migration of materials, yet allowing free movement of water.

High puncture resistance and high tensile strength to resist the strains of installation and use in general is deceisive for the load-bearing capacity of the construction.

Fibertex F-2B and F-320 was chosen for the project.