Cutoff wall

  • Cutoff wall | Geolock

    Cuttof walls are used for both environmental and civil projects. Cutoff wall Geolock is used for the isolation of existing waste disposal sites and the waterproofing of dikes, dams and motorways in cuttings. Geolock has an infinite number of applications and is competitive with traditional materials. Wherever a horizontal underground flow of groundwater, contaminated or otherwise, has to be blocked, Geolock offers the optimal watertight cutoff wall.

  • Cutoff wall


Geolock cutoff wall
Geolock is a plastic waterproof barrier consisting of a patented lock construction made of extruded HDPE with an HDPE 2,0 mm membrane welded to it. This lock construction guarantees optimal waterproofing, thus preventing the leakage of groundwater, contaminated or otherwise. Geolock is not only suitable for the isolation of contaminated soil, it can also be used in numerous other waterproofing (seepage) constructions in civil engineering.

Why Geolock cutoff wall?
The clean-up of contaminated soil is very expensive and not always technically feasible. Removal or in-situ cleaning is often not the most attractive solution in the case of larger areas. An alternative in this case is the encapsulation of the contaminated soil, so that the contamination cannot spread any further. Partially in response to this problem, Geotechnics B.V. developed the Geolock system.

Installation of the Geolock cutoff wall system
Geolock can be installed with the aid of a steel plate that drives the panels to the correct depth by means of a vibrating block. The system is only suitable for installation at a shallow depth in a relatively soft subsoil. In the case of installation at greater depths a Bentonite wall is always constructed first in which the Geolock screen can be installed. The advantage of this method is that installation is possible in almost every type of soil and to a deeper depth.


Applications of the Geolock cutoff wall technique include:

  • Vertical isolation of contaminated soil
  • Waterproof construction in civil engineering
  • Gasproof barrier in the (case of lower groundwater levels)



Design information Geolock cutoff wall
The depth at which the impermeable layer is present, is of major importance to the design of a geolock construction. Once the geological setting is determined, a geohydrological study is most of the time performed to map the flow path of pollution plumes in the time. This study includes the geolock screen. Cofra generally only reviews the workability and method of execution together with the demands for the permeability of the wall.

If you have any questions regarding the application of geolock you can contact us

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