The Durability of Rubble Mound Armour in Service — A Case Study

by Terry Piggott, Queensland Univ of Technology, Brisbane,
Sam Smith, Queensland Univ of Technology, Brisbane,
Angus Jackson, Queensland Univ of Technology, Brisbane,

Document Type: Proceeding Paper

Part of: Durability of Stone for Rubble Mound Breakwaters


Over the past decade, the ongoing monitoring of Gold Coast rubble mound structures in service has demonstrated a serious loss of durability over a period of time in the rock units after placement. Whether the rock armour is exposed directly to wave attack or not, some boulders demonstrate a high rate of fracture and splitting into smaller units generally decreasing the design wave capacity and reducing the crest levels due to overall settlement. The fracture and splitting process is clearly accelerated during blasting of the source rock mass in the quarries but to date no practical method that might cure or reduce the loss of durability has been found.

Subject Headings: Case studies | Riprap | Rock masses | Rocks | Coastal environment | Boulders | Coastal processes | Blasting effects | Australia

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