Prefabricated Vertical Drain Installation at Craney Island

Eastward Expansion Eastward Expansion Portsmouth,VA,

Presented by Aaron D Goldberg PE D GEPresented by Aaron D. Goldberg, PE, D.GEwith U.S. Wick Drain, Inc.

OutlineOutline• Introduction to Prefabricated Vertical Drains

(Wick Drain)• Introduction to Craney Island ProjectIntroduction to Craney Island Project• Over-water Installation of Wick Drains at

Craney IslandCraney Island

Aknowledgementsow edge e s

• Great Lakes Dredge & Dock• Magann• U S Wick Drain• U.S. Wick Drain• Craney Island Design Partners –

M ff t & Ni h l d F Atl tiMoffat & Nichol and Fugro Atlantic

Wick DrainsWick Drains• Plastic band-shaped drains installed with

specialized stichers• Accelerate dissipation of pore water pressures Accelerate dissipation of pore water pressures

in clay and silt. Settlement and Strength.• Replaced sand and gravel drains• Replaced sand and gravel drains.• Typical dimensions are 4-in. wide by 1/8-inch

thi k thick.

Wick DrainsWick Drains

Wick drains reduce the distance that excess water particles have to Wick drains reduce the distance that excess water particles have to travel to reach a draining layertravel to reach a draining layer

Wick DrainsWick Drains

Wick Drains – Anchorage

10

Craney IslandCraney Island• Long term development joint with USACE &

VPA• Settlement and resulting Strength increaseSettlement and resulting Strength increase• Wick Drain Material Specification and Over-

water installationwater installation

Craney Island, Portsmouth, VA

Craney Island, APortsmouth, VA

Craney Island, APortsmouth, VA

Craney IslandCraney Island

Craney IslandCraney Island

InstallationInstallation

InstallationInstallationOver-water installation from barge. Holes were made and cased through the barge for installation.Hitachi 800 and 850 excavator mounted wick drain stictchersdrain stictchersBarge was anchored and winched to move into positionposition.

Installation

Installation

Installation

Installation

Installation

Installation

Installation

I t ll tiInstallation

Installation

Installation

Installation

Additional ResourcesIra Brotman with Moffatt & Nichol presentation on Thursday morning about the dredging on Thursday morning about the dredging aspects. Paper published for annual DFI meeting last week on the wick drainsmeeting last week on the wick drains.

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