Wind-induced uplift of exposed geomembrane covers: A proposed revision to conventional design approaches
| Autor: | R. David Espinoza, Chunling Li, Jeremy W.F. Morris |
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| Rok vydání: | 2020 |
| Předmět: |
Suction
Atmospheric pressure 010102 general mathematics 0211 other engineering and technologies 02 engineering and technology Subgrade Geotechnical Engineering and Engineering Geology 01 natural sciences Wind speed Current (stream) Geomembrane Uplift pressure Wind gust Environmental science General Materials Science Geotechnical engineering 0101 mathematics 021101 geological & geomatics engineering Civil and Structural Engineering |
| Zdroj: | Geotextiles and Geomembranes. 48:24-31 |
| ISSN: | 0266-1144 |
| DOI: | 10.1016/j.geotexmem.2019.103500 |
| Popis: | Conventional approach for exposed geomembrane design assumes that the geomembrane is subjected to an uplift pressure induced by wind above the geomembrane, and the pressure below the geomembrane is kept constant at atmospheric pressure by default. In reality, the exposed geomembrane is typically anchored into subgrade, which limits the exchange of air above and below the geomembrane. Therefore, when the geomembrane is being uplifted, suction will be generated temporarily below the geomembrane. This temporary suction provides significant resistance to uplift during short-duration wind gust. This paper recommended revisions to the current design approach. An average wind velocity within a selected period, instead of the 3-s gust speed, is recommended to be used for design. This period can be selected based on evaluation of how fast air can enter the voids below the geomembrane. |
| Databáze: | OpenAIRE |
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