Physical Model Testing of Broken Armor Stone

by Donald L. Ward, US Army Engineer Waterways, Experiment, Vicksburg, United States,

Document Type: Proceeding Paper

Part of: Durability of Stone for Rubble Mound Breakwaters


Cracking, breaking into two or more pieces, flaking, crumbling, and abrading may reduce an armor stone to a size where wave action can remove it from the structure causing a local instability. The effects of this instability can vary from initiating a massive sloughing and failure of the structure, to readjustment of surrounding stones through self-healing with no affect on structural integrity. A series of physical model tests is planned to investigate the effects of broken armor stones on stability of rubble-mound structures and to develop guidance for field engineers. It is proposed that the tests be directed towards determining the effects of incremental percentages of broken stone on a few generalized structures that are representative of the majority of coastal structures maintained by the Corps. Recommendations and suggestions for the investigation are solicited.

Subject Headings: Physical models | Armor units | Rocks | Field tests | Riprap | Structural analysis | Breaking waves | Wave action

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