Geosynthetics August/September 2019 - 49
Steel strut-supported geomembranes
use prefabricated steel struts in a triangular
configuration at spacings from 7 to 10 feet
(2.1 to 3.0 m) to support a geomembrane
used as the water barrier. An advantage of
this method is that the system can be temporarily stored and rapidly assembled onsite as required. The usual geomembrane
is scrim reinforced, since connections and
tensile stresses are significant. While the
necessary footprint is small, the height is
limited to 5 feet (1.5 m).
Interconnected polymer sheeting is
the direct replica of interlocking steel
sheeting but now using a polymeric
material, usually polyvinyl chloride.
No plasticizer is used in the formulation, thus high bending stiffness results.
Alternative polymer resins are polypropylene and high-density polyethylene. The sheets are sequentially driven
using a lightweight pile-driving hammer
to a depth about equal to the unsupported cantilever height. For higher
heights, cable tiebacks or rods can be
attached near the top of the sheeting
and anchored behind the wall itself. The
footprint is the smallest of these four
alternatives with typical heights of 6 to
9 feet (1.8 to 2.7 m).
In summary, the various safeguards
against flooding resulting from hurricane
activity in coastal areas (as occurred in
Galveston a century ago and in Houston
more recently) such as concrete walls,
ground raising, building raising or simply moving to another location are often
impossible or extremely expensive in
today's built-up coastal communities. That
said, geosynthetic systems (all of which
are ongoing, effective, cost competitive,
and being developed and used by manufacturers and designers alike) provide for
meaningful choices in this regard. G
1a
1b
1c
1d
FIGURES 1a-1d 1a) Geosynthetic reinforced steep soil slopes (courtesy
W. Hsieh); 1b) Geotextile tubes (courtesy TenCate Inc.); 1c) Steel strut-supported
geomembranes (courtesy Portadam Co.); 1d) Interconnected polymer sheeting
(courtesy Brentwood Ind.)
>> For more, search GSI at
www.GeosyntheticsMagazine.com.
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For more information on
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in IFAI's Geosynthetics
magazine contact:
Michelle Cook
651 225 6957
mlcook@ifai.com
www.repurposedmaterialsinc.com
303.321.1471
www.GeosyntheticsMagazine.com
49
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Geosynthetics August/September 2019
Table of Contents for the Digital Edition of Geosynthetics August/September 2019
Geosynthetics August/September 2019 - Cover1
Geosynthetics August/September 2019 - Cover2
Geosynthetics August/September 2019 - 1
Geosynthetics August/September 2019 - 2
Geosynthetics August/September 2019 - 3
Geosynthetics August/September 2019 - 4
Geosynthetics August/September 2019 - 5
Geosynthetics August/September 2019 - 6
Geosynthetics August/September 2019 - 7
Geosynthetics August/September 2019 - 8
Geosynthetics August/September 2019 - 9
Geosynthetics August/September 2019 - 10
Geosynthetics August/September 2019 - 11
Geosynthetics August/September 2019 - 12
Geosynthetics August/September 2019 - 13
Geosynthetics August/September 2019 - 14
Geosynthetics August/September 2019 - 15
Geosynthetics August/September 2019 - 16
Geosynthetics August/September 2019 - 17
Geosynthetics August/September 2019 - 18
Geosynthetics August/September 2019 - 19
Geosynthetics August/September 2019 - 20
Geosynthetics August/September 2019 - 21
Geosynthetics August/September 2019 - 22
Geosynthetics August/September 2019 - 23
Geosynthetics August/September 2019 - 24
Geosynthetics August/September 2019 - 25
Geosynthetics August/September 2019 - 26
Geosynthetics August/September 2019 - 27
Geosynthetics August/September 2019 - 28
Geosynthetics August/September 2019 - 29
Geosynthetics August/September 2019 - 30
Geosynthetics August/September 2019 - 31
Geosynthetics August/September 2019 - 32
Geosynthetics August/September 2019 - 33
Geosynthetics August/September 2019 - 34
Geosynthetics August/September 2019 - 35
Geosynthetics August/September 2019 - 36
Geosynthetics August/September 2019 - 37
Geosynthetics August/September 2019 - 38
Geosynthetics August/September 2019 - 39
Geosynthetics August/September 2019 - 40
Geosynthetics August/September 2019 - 41
Geosynthetics August/September 2019 - 42
Geosynthetics August/September 2019 - 43
Geosynthetics August/September 2019 - 44
Geosynthetics August/September 2019 - 45
Geosynthetics August/September 2019 - 46
Geosynthetics August/September 2019 - 47
Geosynthetics August/September 2019 - 48
Geosynthetics August/September 2019 - 49
Geosynthetics August/September 2019 - 50
Geosynthetics August/September 2019 - 51
Geosynthetics August/September 2019 - 52
Geosynthetics August/September 2019 - Cover3
Geosynthetics August/September 2019 - Cover4
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