Prefabricated Drains or Vick Drains

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Prefabricated Drainsor Vick Drains
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• In general, prefabricated band drains consist of
  a central core, whose function is primarily to
  act as a free drainage channel, and a non-woven
  filter jacket, which prevents the soil
  surrounding the drain from entering the central
  core but allows water to flow in.

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• The drain which is placed inside the mandrel
  with tip anchor

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• The details of band drain and tip anchor.

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Geocomposite Wick Drains

• also called prefabricated vertical drains (PVDs)
• used for rapid consolidation of saturated fine
  grained soils
• consists of a drainage core with a GT
  filter/separator wrapped completely around it
• typically 100 mm wide, by 2 to 10 mm thick, by
  ?100 m long (in roll or coil form)

(Driving Wick Drains)
(Ready for Surcharge Fill)
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How are vertical wick drains designed?

• How are vertical wick drains designed?
• The vertical wick drains are usually placed in a
  triangular configuration of 3 to 12 feet (1 to 4
  meters) - depending on the desired consolidation
  time. As a result of this method of accelerating
  the consolidation process, uneven
  post-construction settlements can be virtually
  eliminated.