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Title: Soft soil stabilization study for Wilmington Harbor South Dredge Material Disposal Area
Authors: Drexel University.
United States. Army. Corps of Engineers. Philadelphia District.
Koerner, Robert M., 1933-
Fowler, Jack, 1938-
Lawrence, Christopher A.
Keywords: Dredged material
Dredging spoil
Soft soils
Soil stabilization
Seagirt Project
Vertical drains
Sand drains
Wilmington Harbor
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-86-38.
Description: Miscellaneous Paper
Abstract: High- strength geotextiles coupled with polymeric vertical strip drains have essentially replaced the use of sand drains in the consolidation of soft clay deposits. Soft soils described in this report were saturated fine-grained organic silts and clays with an undrained shear strength of less than 100 lb/ft² These materials were typical of maintenance dredged materials that are dredged by the US Army Corps of Engineers from rivers, port facilities, and harbors. This report contains a critique of the state of the art for soil stabilization using geosynthetic materials. It describes the implementation and performance of a high-strength geotextile and vertical strip drains in an ongoing project, Seagirt Project, being constructed by the Maryland Port Authority, Baltimore, Maryland The Seagirt Stabilization Project consisted of a 113-acre dredged material containment area that contained 18 ft of fine-grained dredged mater ial 50 to 150 percent above the liquid limit to depths of 20 to 33 ft. This surface contained "alligator cracked crust" 3 to 12 in. deep on the ground surface allowing one to walk on most of the areas to be stabilized. This report discusses the design philosophy, construction methodology, and development of new and innovative materials that are being developed for solving complex geotechnical problems. Rapid consolidation of soft, compressible, fine-grained soils by both radial and vertical drainage with plastic strip drains can effectively reduce the consolidation time by a factor of 10. Penetration of the plastic strip drains on 5-ft centers through a sand blanket and high performance geotextile caused minimum damage to the performance properties of the fabric. A single layer of high performance geotextile with tensile strengths above 1,000 lb/in. and a minimum thickness of sand placed directly on fabric coupled with the use of low ground pressure equipment was a key element in the success of this project. Purpose of this report was to evaluate the performance of the geotextile at the Seagirt Project and its bearing on the proposed Corps of Engineers project in the Port of Wilmington, Delaware, entitled "Wilmington Harbor South Disposal Area", and other similar projects in the future.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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