Geotextiles in Embankment Dams - Association of State Dam Safety ...

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Geotextiles in Embankment DamsThere are many variations on the above types such as monofilament on tape, slit tapeon fibrillated tape, heat set, needlepunched, etc.An important development with respect to geotextile filtration applications forembankment dams is the development of a two-layer geotextile (Giroud, Delamas,and Artieres, 1998), (Artieres and Tcherniavsky, 2003). By combining two differentgeotextile materials into a single fabric, the optimal properties of each geotextile canbe combined. Such a combination could be a light weight geotextile selected forfiltration, which alone would be vulnerable to installation damage, being combinedwith a heavy weight geotextile that is very strong but open to filtration and drainage.Such combinations have been made by joining two different woven geotextiles, twodifferent nonwovens geotextiles, and it is also possible to join a woven and anonwoven geotextile together to form a single material for placement. Even threelayer or multilayer materials are possible to manufacture with a high degree ofquality. An emerging advancement in geotextile filtration is the joining 2 or 3 layersof nonwoven geotextiles of different porometry, which when lightly needled togetherproduces a graded filter.Figure 2.20.—Examples of nonwoven geotextiles showing variation in weight. At top a4 oz/yd 2 geotextile, at lower left a 32 oz/yd 2 geotextile.38
Chapter 2—Overview of Geosynthetics for Use in Embankment DamsFigure 2.21.—Photomicrograph showing a nonwoven needle-punched continuous fibergeotextile, (1 mm scale).Figure 2.22.—Nonwoven needle-punched staple fiber geotextile, magnified view (1 mmscale). Note that the needle holes are visible in the photograph.39
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Page 10 and 11: ContentsPreface ...................
Page 12 and 13: Geotextiles in Embankment Dams4.4.2
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Page 23 and 24: IntroductionGeotextiles are widely
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GlossaryAbrasion (ASTM D 653, 2005)
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FilterTucurui DamBrazil103 Nonwoven
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FilterAit ChouaritDam, Morocco150 N
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FilterTorcy-VieuxDam, France12.7 Ge
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FilterMany FarmsDam,Arizona, USA13.
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Protectivecushion for ageomembraneB
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SECTION 02342 - GEOTEXTILEPART 1GEN
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5 [Table 02342A. - Geotextile Sampl
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Table 02342B. - Geotextile Physical
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1. Cover material depth required fo
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3. Repair damaged geotextile by pla
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