PROTOTYPE EXPERIENCE WITH THE USE OF DISSIMILAR 



ARMOR FOR REPAIR AND REHABILITATION OF 



RUBBLE-MOUND COASTAL STRUCTURES 



PART I: INTRODUCTION 

 Background 



1. There exists a lack of design guidance or information concerning the 

 interfacing and stability response of armor units that are of dissimilar type 

 and/or size. In the past, selection of new armor type, method of interfacing, 

 and procedures for preparation of the existing section have been based on engi- 

 neering judgment or, in more recent times, on site-specific model studies. 

 Such studies have provided good singular solutions, but the data usually fail 

 to meet the requirements of other projects. It is anticipated that the prob- 

 lem will become more acute in future years as rehabilitation of major break- 

 waters and jetties becomes necessary to extend their project life or to meet 

 greater design demands. 



Purpose 



2. The primary objective of this report is to provide a summarized in- 

 ventory of existing US Army Corps of Engineers (Corps) projects that have used 

 dissimilar armor for repair and rehabilitation of rubble-mound coastal struc- 

 tures. These data will provide guidance in establishing research priorities 

 to develop rehabilitation design information for dissimilar armor. 



