POINTS OF CONTACT - doern50017

ERDC TN-DOER-N5

July 2000

Techniques were presented for analyzing the stability of subaqueous dredged material deposits,

whether or not caps are used. Various shapes and locations of potential failure surfaces must be

analyzed to determine the most critical potential failure plane.

Methods for analyzing the consolidation potential of CAD deposits were recommended. Use of

finite (large) strain consolidation theory is necessary for these soft materials. Consideration must

be given to potential consolidation of not only the contaminated dredged material, but also of the

foundation soils and the capping material.

The behavior of dredged materials placed in contained aquatic disposal sites is a complex geotech-

nical phenomenon that is poorly understood. However, as more studies are undertaken and

significant amounts of geotechnical data are produced, knowledge of these deposits and ability to

predict their behavior both for consolidation and stability will improve.

POINTS OF CONTACT: For additional information, contact the author, Dr. Marian P. Rollings

(601-634-2952, rollinm@wes.army.mil), or the Program Manager of the Dredging Operations and

Environmental Research Program, Dr. Robert M. Engler (601-634-3624, englerr@wes.army.mil).

This technical note should be cited as follows:

Rollings, M. P. (2000). "Geotechnical considerations in contained aquatic disposal

design," DOER Technical Notes Collection (ERDC TN-DOER-N5), U.S. Army Engineer

Research and Development Center, Vicksburg, MS. www.wes.army.mil/el/dots/doer/

REFERENCES

American Society for Testing and Materials. (1999a). "Standard test method for field vane shear test in cohesive soil,"

Designation D 2573, 1999 Annual Book of ASTM Standards, Volume 04.08, West Conshohocken, PA.

American Society for Testing and Materials. (1999b). "Standard test method for laboratory miniature van shear test

for saturated fine-grained clayey soil," Designation D 4648, 1999 Annual Book of ASTM Standards, Volume 04.08,

West Conshohocken, PA.

American Society for Testing and Materials. (1999c). "Standard test method for one-dimensional consolidation

properties of soils," Designation D 2435, 1999 Annual Book of ASTM Standards, Volume 04.08, West

Conshohocken, PA.

Cargill, K. W. (1983). "Procedures for prediction of consolidation in soft fine-grained dredged material," Technical

Report D-83-1, U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS.

Cargill, K. W. (1985). "Mathematical model of the consolidation/desiccation processes in dredged material," Technical

Report D-85-4, U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS.

Clausner, J. E., Lillycrop, L. S., McDowell, S. E., and May, B. (1998). "Overview of the Mud Dump Capping Project

design," Proceedings, XVth World Dredging Congress, WEDA, Las Vegas, NV.

Edris, E. V., and Wright, S. G. (1992). "UTEXAS3 slope-stability package," Instruction Report GL-87-1, 4 volumes,

U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS.

ENSR. (1997). "Summary of capping investigations," BHNIP Independent Observer Report I/O-9703, ENSR

Document Number 4479-001-120 prepared for Massachusetts Coastal Zone Management Agency, Executive

Office of Environmental Affairs, Boston, MA, by ENSR, Acton, MA.

Gibson, R. E., England, G. L., and Hussey, M. J. L. (1967). "The theory of one-dimensional consolidation of saturated

clays; I. Finite, non-linear consolidation of thin homogeneous layers," Geotechnique 17, 261-273.