GSI hosts webinar on wave management in geomembranes

January 31st, 2018 / By: / Industry News, News

The Geosynthetic Institute (GSI) will sponsor a webinar entitled “Wave (or Wrinkle) Management for Proper Deployment of Geomembranes,” on Feb. 14, 2018, from 11:30 a.m. to 1 p.m. EDT.

An intrinsic property of all exposed geomembranes is that they expand and contract depending upon ambient temperature. During times of elevated temperature, waves (also called wrinkles) may appear in installed geomembranes before they are backfilled or otherwise covered. The thicker and stiffer the geomembrane, the more the phenomenon occurs. This webinar will show that such waves, when backfilled, will not disappear. Laboratory and field exhumations indicate that the waves squash forming creases in the subsequent installed material. The disadvantages of this situation are lack of intimate contact, increased potential seepage, tensile stresses at folds, minidam formation and possible equipment damage to the tops of folds.

There are a number of methods which can be used by the contractor/installer to avoid waves, including:

  • Push/accumulate/cut/seam
  • Fixing berms
  • White sheet
  • Temporary tent
  • Backfill in early morning or night

The webinar advances in progressive stages of overview/background, fate of waves, implications of entombed waves, achieving intimate contact, and summary/recommendations. Participants will learn the basic reason for the occurrence of geomembrane waves and the various reasons for not entombing them during backfilling. Entombed waves as small as 0.6 inches (14 mm) in height do not disappear after backfilling. While the methods used to avoid the situation are time consuming and tend to be expensive, they are necessary for a proper geomembrane installation.

Webinar participants will learn the cause of field deployed geomembrane waves, the fate of waves upon backfilling, the negative implications of entombed waves, methods of achieving intimate contact without waves, the current status of the situation and how current practice must be improved.

This webinar will be useful for federal, state and local governmental agency employees working with geomembrane-lined solid waste facilities; private and public owners of such facilities; solid waste consultancies and testing laboratories; construction quality assurance inspectors of lined waste facilities; and geomembrane installers and earthwork contractors for solid waste facilities.

The webinar will be taught by Dr. Robert M. Koerner, professor emeritus of civil engineering at Drexel University and director emeritus of the Geosynthetic Institute.

Webinars cost $200.00 for GSI members and $250.00 for nonmembers. Successful completion of a multiple-choice test after the webinar carries 1.5 professional development units.

For more information or to register, visit http://www.geosynthetic-institute.org/webinar.htm.

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