Geosynthetics August/September 2021 - 22

Geosynthetic portable cofferdams for civil construction applications
curtain is installed for stability, reducing
movement or tipping as a result of
hydrodynamic loading. The local water
source is normally used to fill the inner
tubes of the dam. This cofferdam system
was first introduced in the early 1990s
and is constructed in a range of sizes
from 4-16-foot (1.2-4.9-m) diameter
in standard 100-foot (30-m) and 200foot
(61-m) lengths. Special connecting
collars are used to join the dams during
installation. Standard fill and drain ports
are installed into each dam. Installation
of the dams requires trained technicians
and equipment and can be far more difficult
in moving water applications than
slow or still water projects. Special patch
kits and repair techniques are used in
the event the dams are punctured during
the installation or in application. Figure
4 shows the modular capabilities of the
portable cofferdams.
FIGURE 2 Installation of 6-foot (1.8-m) cofferdams in Eagle River, Colo.
Design and engineering
This section summarizes the system stability
and engineering needs of waterfilled
manufacturer's dams. System stability
is critical to the successful use and
installation of portable cofferdams. The
basic principle behind the water-filled
dam system incorporates a dual inner
tube system with a center baffle to stabilize
the structure. The safety factor
against sliding depends greatly on the
coefficient of friction of the material that
the dam is sitting on. In this case, where
it is sitting on a wet grass surface, the
coefficient of friction used is 0.20 (Noon
1994). The factor of safety against sliding
is 1.33 when 24 inches (61 cm) of water is
being held back.
As the water builds on one side of the
dam, the inner tubes prevent rolling, and
the dam behaves as a solid barrier.
Engineering designs with properly
FIGURE 3 U.S. Army Corps of Engineers 10 × 8-foot (3.0 × 2.4-m) cofferdam in Baytown, Texas
22
Geosynthetics | August September 2021
calculated safety factors are required
based on individual manufactured

Geosynthetics August/September 2021

Table of Contents for the Digital Edition of Geosynthetics August/September 2021

Geosynthetics August/September 2021 - Cover1
Geosynthetics August/September 2021 - Cover2
Geosynthetics August/September 2021 - 1
Geosynthetics August/September 2021 - 2
Geosynthetics August/September 2021 - 3
Geosynthetics August/September 2021 - 4
Geosynthetics August/September 2021 - 5
Geosynthetics August/September 2021 - 6
Geosynthetics August/September 2021 - 7
Geosynthetics August/September 2021 - 8
Geosynthetics August/September 2021 - 9
Geosynthetics August/September 2021 - 10
Geosynthetics August/September 2021 - 11
Geosynthetics August/September 2021 - 12
Geosynthetics August/September 2021 - 13
Geosynthetics August/September 2021 - 14
Geosynthetics August/September 2021 - 15
Geosynthetics August/September 2021 - 16
Geosynthetics August/September 2021 - 17
Geosynthetics August/September 2021 - 18
Geosynthetics August/September 2021 - 19
Geosynthetics August/September 2021 - 20
Geosynthetics August/September 2021 - 21
Geosynthetics August/September 2021 - 22
Geosynthetics August/September 2021 - 23
Geosynthetics August/September 2021 - 24
Geosynthetics August/September 2021 - 25
Geosynthetics August/September 2021 - 26
Geosynthetics August/September 2021 - 27
Geosynthetics August/September 2021 - 28
Geosynthetics August/September 2021 - 29
Geosynthetics August/September 2021 - 30
Geosynthetics August/September 2021 - 31
Geosynthetics August/September 2021 - 32
Geosynthetics August/September 2021 - 33
Geosynthetics August/September 2021 - 34
Geosynthetics August/September 2021 - 35
Geosynthetics August/September 2021 - 36
Geosynthetics August/September 2021 - 37
Geosynthetics August/September 2021 - 38
Geosynthetics August/September 2021 - 39
Geosynthetics August/September 2021 - 40
Geosynthetics August/September 2021 - 41
Geosynthetics August/September 2021 - 42
Geosynthetics August/September 2021 - 43
Geosynthetics August/September 2021 - 44
Geosynthetics August/September 2021 - Cover3
Geosynthetics August/September 2021 - Cover4
Geosynthetics August/September 2021 - GeoNashville Attendee Brochure 1
Geosynthetics August/September 2021 - GeoNashville Attendee Brochure 2
Geosynthetics August/September 2021 - GeoNashville Attendee Brochure 3
Geosynthetics August/September 2021 - GeoNashville Attendee Brochure 4
Geosynthetics August/September 2021 - GeoNashville Attendee Brochure 5
Geosynthetics August/September 2021 - GeoNashville Attendee Brochure 6
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-april-may-2022
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-february-march-2022
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-december-2021-january-2022
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-october-november-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-august-september-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-june-july-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-april-may-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-february-march-2021
https://www.nxtbook.com/ifai/geosynthetics/1220GS
https://www.nxtbook.com/ifai/geosynthetics/1020GS
https://www.nxtbook.com/ifai/geosynthetics/0820GS
https://www.nxtbook.com/ifai/geosynthetics/0620GS
https://www.nxtbook.com/ifai/geosynthetics/0420GS
https://www.nxtbook.com/ifai/geosynthetics/0220GS
https://www.nxtbook.com/ifai/geosynthetics/1219GS
https://www.nxtbook.com/ifai/geosynthetics/1019GS
https://www.nxtbook.com/ifai/geosynthetics/0819GS
https://www.nxtbook.com/ifai/geosynthetics/0619GS
https://www.nxtbook.com/ifai/geosynthetics/0419GS
https://www.nxtbook.com/ifai/geosynthetics/0219GS
https://www.nxtbook.com/ifai/geosynthetics/1218GS
https://www.nxtbook.com/ifai/geosynthetics/1018GS
https://www.nxtbook.com/ifai/geosynthetics/0818GS
https://www.nxtbook.com/ifai/geosynthetics/0618GS
https://www.nxtbook.com/ifai/geosynthetics/0418GS
https://www.nxtbook.com/ifai/geosynthetics/0218GS
https://www.nxtbookmedia.com