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

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Geotextiles in Embankment Damssystem of subgrades has been developed (AASHTO, 1996). Based upon the qualityof the subgrade, different strength requirements for the geotextile are established.For use in dams, no such classification system has been widely adopted. The Bureauof Reclamation in their design standard on geotextiles (Bureau of Reclamation, 1992)has a two-tiered classification of either Class A or Class B defined as follows:Class A – Applications where installation stresses are considered more severe thanClass B, very sharp angular aggregate is utilized/or is present in significantpercentages, or where cover materials will be subjected to compaction greater than95 percent.Class B – Applications where the foundation/subgrade is smooth having no sharpangular projections, no sharp angular aggregate is used, and compactionrequirements are less than 95 percent.Regardless of the exact nature of the subgrade, geotextiles must be placed in intimatecontact with the soil that they are being used in or on. For a stiff woven geotextilethe soil surface should be as smooth as possible. Nonwoven geotextiles are moreflexible and will conform better to an irregular surface but the goal should be toprovide as smooth of a surface as possible for nonwovens geotextiles as well.Typically, the subgrade will be compacted with a smooth drum roller (fig. 6.4),bladed smooth with a motor patrol (if the slope is 3H to 1V or flatter) and then recompactedwith a smooth drum roller. For slopes steeper than 3H to 1V the rollerwill have to be secured in a safe manner to allow it to traverse up and down theslope. Depending on the material, vibration may be utilized. The goal is to have asmooth subgrade surface with no rock protruding. It is recommended that laborerswalk the subgrade and remove rocks over ½ inch in size. Pockets of coarsefragments should be filled with sand to provide a smooth surface. The intent is toremove any sharp rock fragments that puncture and/or tear the geotextile and to fillvoids in the subgrade.120
Chapter 6—Construction Methods and ConsiderationsFigure 6.4.—Photograph showing compaction equipment preparing a suitably smooth andfirm subgrade surface for geotextile placement.Figure 6.5.—Photograph showing a defect in a prepared subgrade surface. This portion ofthe subgrade was rejected by the inspector and had to be filled and smoothed.121
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Geotextiles in Embankment DamsStatu
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Geotextiles in Embankment DamsManag
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ContentsPreface ...................
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Geotextiles in Embankment Dams4.4.2
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Geotextiles in Embankment DamsFigur
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Geotextiles in Embankment Dams3.14
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Geotextiles in Embankment DamsCommo
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Geotextiles in Embankment DamsWebsi
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IntroductionGeotextiles are widely
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IntroductionExpansion of the roles
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Chapter 1Current Policy on the Use
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Chapter 1—Current Policy on the U
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Geotextiles in Embankment Dams2.5 G
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Geotextiles in Embankment Dams2.13.
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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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