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Title: Perimeter dike stability analyses, Craney Island Disposal Area, Norfolk District, Norfolk, Virginia
Authors: United States. Army. Corps of Engineers. Norfolk District.
Fowler, Jack, 1938-
Edris, Earl V.
Hanks, William L.
Holloway, Tara Schreiner.
Keywords: Dikes
Dredged material disposal
Soft foundations
Slope stability analysis
Craney Island Disposal Area
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; GL-87-4.
Description: Miscellaneous Paper
Abstract: This study investigates the stability of existing and proposed perimeter dikes at Craney Island disposal area when the crest elevations are raised to el +34 on the west and el +40 on the east side. With these crest elevations , the dredged material could be raised to el +30 on the west side and el +36 on the east side. Dike configura tions were developed for the west leg, east leg, north leg, and northwest corner. The west leg required a 2-ft road berm and a water berm to achieve a safety factor of 1.3. The other sections did not require any additional berms or setbacks. By raising the dike on the i nward side using the same slopes, the safety factors were above 1.3. Reinforcement of the raised dikes was found not to be feasible. Dike settlement was evaluated. It was found that the use of wick drains to increase the shear strength of the soft foundation clay was not economically feasible because of the excess depth of the dike cross section. Settlement from raising the east, west, and north perimeter dikes was estimated to be about 4 ft.
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