Public works


SOMTUBE FTF - Rear drainage of mechanically stabilized earth (MSE) backfill

Marquage CE


Water ingress in soil can damage the structures and jeopardise its durability. This is why it is important to use an appropriate and effective drainage solution.

SOMTUBE® FTF limits hydraulic underpressure when the groundwater is rising and prevents water infiltration into the structure. This solution is recommended for a number of applications :

  • Implementation of a draining mask
  • Implementation of drainage in road structure
  • Implementation of drainage in road structure on compressible soil
  • Implementation of drainage at the rear of mechanically stabilised earth backfill
  • Implementation of drainage under railways

For the rear drainage of mechanically stabilised earth backfill, SOMTUBE® FTF must be installed to discharge water at the interface between the technical embankment and the existing backfill. Depending on the structure’s construction arrangements (height of the wall, materials available, etc.) there are two possible installation methods for this product :

  • Installation from the bottom of the slope
  • Installation from the crest

For drainage in road structure and under railways, SOMTUBE® FTF replaces the traditional granular materials and geotextile filters system. It can also be used in flood-proof areas and compressible areas in addition to vertical drains.

For draining masks, SOMTUBE® FTF helps to stop water inflows on natural slopes or embarkments. It replaces the traditional granular draining materials and geotextile filters system.



  • Enhance soil drainage performance
  • Ease of installation with a single product to unroll
  • Increased stability of the slope in the event of a draining mask application
  • Reduced movement of construction machinery on the work site
  • Reduction in construction and earthwork time
  • Material savings
  • Reduction of carbon footprint because the input of granular materials on site is avoided
  • An economical solution because the transport cost is significantly reduced 


Drainage Drainage
Filtration Filtration
Mechanical protection Mechanical protection


  • Polypropylene geocomposite
  • Roll width : 3.90 m
  • Roll length : 50 m
  • 3 diameters of perforated mini-drains : 16 mm, 20 mm and 25 mm
  • 4 possible distances between mini-drains : 200 cm, 100 cm, 50 cm and 25 cm