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Suction component to resist uplift?

News, Q&A: GMA Techline | June 1, 2015 | By:

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Questions and answers from the GMA Techline

What about a reservoir geomembrane liner over a secondary hot-mix asphalt (HMA) liner with adequate anchorage below the crest (fill embankment) and at the bottom (minimum water depth)? The secondary HMA liner is intended to be “impermeable” and should therefore limit wind-induced uplift due to the increased volume and corresponding decreased air pressure beneath the geomembrane when uplifting begins. Since Giroud, et al. (1995) assumed a permeable medium beneath the geomembrane, it seems that a sub-membrane resisting (suction) component applied to their general approach would be appropriate. Has this been considered?

Jim | USA

Hi Jim,

The HMA liner directly beneath the geomembranes seems to make your situation different from a permeable medium being beneath the geomembrane for the reason you suggest. I would go a step further and use a textured geomembrane with the added hope that some bonding might occur depending in part on what type of texturing you use.

Bob Koerner | GMA Techline

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