Case Study -- Performance Investigation of a Sunken Concrete Ship Cargo Handling Wharf at the Port of Newport Oregon.

In 1948, the Port of Newport sank two flat-bottom concrete ships in Yaquina Bay, Oregon, to serve as wharves for cargo handling. Prior to sinking the ships, a minimum amount of subgrade preparation was performed by excavating relatively flat benches into the Recent alluvial sand and underlying marine sedimentary rocks. The ships were then floated into place parallel to the by shore and sunk by blasting holes in their sides and bottoms. The ship hulls and the area between the hulls and the shore were subsequently backfilled and dredged with sand. The holes in the hulls and bottom of the ships remained open, which allowed the flow of water into and out of the hulls with the fluctuating tides. Port of Newport records indicate that over the past 30 years, the westernmost hull has moved episodically about 3 feet southward toward the bay, resulting in settlement of the dredged sand backfill, damage to the laydown area pavements, structural damage to the hull, and considerable maintenance expenditures. The easternmost hull has reportedly been stable. In 2000, a geotechnical investigation was undertaken to identify the conditions causing movement of the hull and to determine whether the movement was occurring at the subgrade-ship interface or whether there was a deep-seated failure occurring in the marine sedimentary rock and the results are presented in this paper.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 1250-1261
  • Monograph Title: Coastal Structures 2003

Subject/Index Terms

Filing Info

  • Accession Number: 01004018
  • Record Type: Publication
  • ISBN: 0784407339
  • Files: TRIS
  • Created Date: Sep 12 2005 1:09PM