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Single layer interlocking armour units are commonly applied for protection of breakwaters and seawalls as they are more cost efficient and more sustainable than traditional double layer armouring. However, after initial damage single layer armouring is considered more vulnerable than double layer armouring. Therefore single layer armour units are mostly applied with relative large safety margins. XblocPlus, an interlocking single layer armour unit that is placed with uniform orientation was introduced by DMC in 2018. The unit is applied with a large safety margin as physical model test were performed without damage up to stability numbers of Hs/ΔDn=5.5 whereas a design stability number of Hs/ΔDn=2.5 has been adopted. Nonetheless the behaviour of an XblocPlus armour layer after initial damage is has been investigated by physical model tests with broken model units.

STABILITY OF XBLOCPLUS ARMOUR LAYERS AFTER INITIAL DAMAGE