TECHNICAL PAPERS
Oct 1, 1988
Bulkhead Failure Investigation and Redesign
Publication: Journal of Geotechnical Engineering
Volume 114, Issue 10
Abstract
A 300‐ft‐long anchored bulkhead at Kake, Alaska, failed following placement of fill behind the bulkhead wall. The entire wall rotated outward at the toe and moved downslope 40 to 60 ft. No on‐site over‐water borings had been made, but local geologic investigations and pile driving resistances noted during construction suggested that a 5‐ to 20‐ft‐thick zone of soft marine clay overlying relatively dense offshore sloping soils and shallow bedrock lay beneath the project site. The failure is believed to have resulted in the displacement of the soft clay down to the surface of the competent soils. After the failure, the granular fill originally placed behind the bulkhead lay immediately over competent soils along the bulkhead alignment. Observations from onshore borings, dredging, and offshore test pile driving after the failure support the conclusion that the clay was removed from the bulkhead and till area by the failure. The bulkhead was redesigned with its alignment about 24 ft inland, and with a higher dredgeline elevation. It was successfully completed using materials salvaged from the original construction. Postconstruction alignment surveys have not disclosed any movement of the reconstructed wall.
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Copyright © 1988 ASCE.
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Published online: Oct 1, 1988
Published in print: Oct 1988
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Ross D. Rieke
Proj. Engr., Hart Crowser, Inc., 1910 Fairview Ave. E., Seattle, WA 98102
John C. Crowser
Exec. Vice Pres., Hart Crowser, Inc., Seattle, WA 98102
W. L. Schroeder, Members, ASCE
Prof., Dept. Civ. Engrg., Oregon State Univ., Corvallis, OR 95331
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