MOVEMENT AND STATIC STRESS IN DOLOSSE: SIX YEARS OF FIELD MONITORING AT CRESCENT CITY

Thomas R. Kendall, Jeffrey A. Melby

Abstract


Breakwater failures have often been caused by or at least exacerbated by a structural failure of concrete armor units, especially when the units are the more slender type such as dolosse. To aid in the development of a structural design procedure for complex concrete armor units, post-construction monitoring of movement and stress in dolosse has been ongoing on the outer breakwater at Crescent City, California since its rehabilitation in 1986. This paper describes the significance of static stress in large (38-tonne) dolosse and documents the continued rapid growth of dolos static stress in a relatively nested shallow-water breakwater. New data from 1990, 1991 and 1992 have modified the previously suggested conclusion that dolos static stress was increasing at a decreasing rate (Kendall and Melby, 1989). These new data suggest that while dolos movement has continued to subside, static stress has been building approximately linearly.

Keywords


static stress; dolos; field monitoring; Crescent City

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