Xbloc - Effective ware protection for breakwaters and shores


Extensive research both on hydraulic stability and structural integrity has proven Xbloc to be the most reliable single layer armour unit. Experience acquired during a decade of Xbloc Projects all around the world under various conditions make theory come true as the armour units have proven to perform outstanding.

Excellent hydraulic stability

  • For concept design a Kd value [stability coefficient in the Hudson formula] of 16 [trunk section] and 13 [head section] should be applied;
  • The stability coefficient of the Xbloc is the same for breaking and non-breaking waves;
  • Xbloc has a safety margin of at least 20 % without damage to the armour layer. See also: Hydraulic Performance of Xbloc Armour Units.

Automatic interlocking

  • Xbloc units naturally find a stable position on the slope;
  • Self repairing of the Xbloc armour layer after damage is enhanced by automatic interlocking;
  • The Xbloc unit is simple to place, due to the straightforward placement principle.

Low wave overtopping

  • The highly porous armour layer minimizes wave overtopping. For more information see: CLASH test results: Overtopping performance of different armour units for rubble mound breakwaters;
  • For guidance on overtopping coefficients see: Overtopping and Wave reflection.

Low wave reflection

Outstanding structural integrity

The structural integrity of the Xbloc was evaluated by using:

  • Prototype drop tests [The Netherlands, Georgia, Ireland and U.A.E.];
  • Finite element calculations.

All studies and project experience prove the Xbloc to be a structurally strong unit able to cope with the loads that can be expected during its lifetime from manufacture to operation. Ordinary concrete C25/30 can be used for the production of Xbloc armour units. Read more:
Placement and structural strength of Xbloc and other single layer armour units.
Structural Integrity of the Xbloc breakwater armour units prototype and numerical droptests.