Accession Number : ADA182769

Title :   Perimeter Dike Stability Analyses Craney Island Disposal Area, Norfolk Districk, Norfolk, Virginia.

Descriptive Note : Final rept. May-Oct 86,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB

Personal Author(s) : Fowler,Jack ; Edris,Earl V , Jr ; Hanks,William L ; Holloway,Tara S

PDF Url : ADA182769

Report Date : May 1987

Pagination or Media Count : 61

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)

Descriptors :   *DIKES, *STRUCTURAL ENGINEERING, *CIVIL ENGINEERING, CROSS SECTIONS, DREDGED MATERIALS, SAFETY, CLAY, WATER, DISPOSAL, SHEAR STRENGTH, VIRGINIA, SOIL SURVEYS, SOIL MECHANICS, STABILITY

Subject Categories : Civil Engineering
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE