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Seepage through geosynthetic-tube dam

Q&A: GMA Techline | June 1, 2014 | By:

I am trying to determine the steady-state seepage through a stack of sand-filled geosynthetic tubes with a triangular cross section (4-3-2-1 tubes). The permeabilities of the sand and the tube material are known. Can you suggest places I should look to get information on how to analyze this problem?

(Ray | Virginia)

Reply: I would first consider the geometric situation to be all sand and draw a flow net in the traditional sense. Then I would use a stratified soil mass model using different permeabilities and thicknesses as in Terzaghi and Peck on pages 54–56. In it I would use three layers: sand, filter layer, and fabric. Lastly, I would use Bardet’s book, Experimental Soil Mechanics, using finite difference equations. [We] will send you a PowerPoint presentation that might give you some ideas. (Why he put it into a lab soils book I have no idea!)

Bob Koerner | GMA Techline

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