Perimeter Dike Stability Analyses Craney Island Disposal Area, Norfolk Districk, Norfolk, Virginia.
Abstract
*This study investigates the stability of existing and proposed perimeter dikes at Craney Island disposal area when the crest evaluations are raised to e1 +34 on the west and e1 +40 on the east side. With these crest elevations, the dredged material could be raised to e1 +30 on the west side and e1 +36 on the east side. Dike configurations 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 inward 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. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1987
- Accession Number
- ADA182769
Entities
People
- Earl V. Edris Jr.
- Jack Fowler
- Tara S. Holloway
- William L. Hanks