Geosynthetics June/July 2021 - 26

Design of reinforcement geosynthetics in landfill piggyback expansion
installation. This will be covered in the
following " Geosynthetic design " section.
The ULS verification (Equation
3) is then:
(3)
The selected reinforcement
geosynthetic is a highmodulus
woven geotextile
made with high-tenacity
yarns, manufactured by a
warp-knitting process. The
woven geotextile provides
the separation function,
whereas the high-tenacity
yarns give the high
strength capacity to the
overall product.
where:
Tult: Ultimate tensile resistance of the
reinforced geosynthetics
RFs: Reduction factors specific to the
product, the environment and the
installation
Geosynthetic design
Product description
The selected reinforcement geosynthetic
is a high-modulus woven geotextile made
with high-tenacity yarns, manufactured
by a warp-knitting process (Figure 4).
The woven geotextile provides the separation
function, whereas the high-tenacity
yarns give the high strength capacity
to the overall product. It allows tensile
strength up to 11,420 pounds-force per
inch (2,000 kN/m).
The process guarantees a high level
of reinforcement with reduced elongation
as the cables are inserted without
undulation during the knitting process.
It also allows dissociating the separation
and reinforcement functions.
Indeed, because the high-tenacity polymer
yarns provide the reinforcement
capability of the product, the woven
geotextile keeps its filtration opening
size constant regardless of the tensile
strength of the geosynthetic. The composition
of the high-tenacity yarns
(polyester [PET], polyvinyl alcohol
[PVA], etc.) is selected according to
the type of structure and the nature of
the surrounding soils.
The reinforcement geosynthetic
selected for this project is GEOTER F
PVA 450. It is made with PVA hightenacity
yarns and has an ultimate
tensile strength of 2,570 pounds-force
per inch (450 kN/m). The sizing of the
geosynthetic is described in the following
paragraphs.
Product sizing
The minimum required long-term
tensile strength and elongation for the
reinforcement geosynthetic has been
calculated by the project engineer with
a geotechnical design. Then, a study
has been performed by the geosynthetic
manufacturer to select the appropriate
product. As for any project using
geosynthetics, this study considered
(Equation 4):
(4)
FIGURE 4 Description of the reinforcement geosynthetic
26
Geosynthetics | June July 2021
where:
Tdesign: allowable tensile strength
(pounds-force per inch [kN/m])
RFCR: reduction factor for creep to
account for long-term behavior
RFID: reduction factor for installation
damage, determined from construction
damage tests
RFD: reduction factor for durability,
chemical resistance of the polymer
in the specific environment under
consideration
RFglobal: safety coefficient on the geosynthetic
material, equal to 1.25 for
every application

Geosynthetics June/July 2021

Table of Contents for the Digital Edition of Geosynthetics June/July 2021

Geosynthetics June/July 2021 - Cover1
Geosynthetics June/July 2021 - Cover2
Geosynthetics June/July 2021 - 1
Geosynthetics June/July 2021 - 2
Geosynthetics June/July 2021 - 3
Geosynthetics June/July 2021 - 4
Geosynthetics June/July 2021 - 5
Geosynthetics June/July 2021 - 6
Geosynthetics June/July 2021 - 7
Geosynthetics June/July 2021 - 8
Geosynthetics June/July 2021 - 9
Geosynthetics June/July 2021 - 10
Geosynthetics June/July 2021 - 11
Geosynthetics June/July 2021 - 12
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Geosynthetics June/July 2021 - 14
Geosynthetics June/July 2021 - 15
Geosynthetics June/July 2021 - 16
Geosynthetics June/July 2021 - 17
Geosynthetics June/July 2021 - 18
Geosynthetics June/July 2021 - 19
Geosynthetics June/July 2021 - 20
Geosynthetics June/July 2021 - 21
Geosynthetics June/July 2021 - 22
Geosynthetics June/July 2021 - 23
Geosynthetics June/July 2021 - 24
Geosynthetics June/July 2021 - 25
Geosynthetics June/July 2021 - 26
Geosynthetics June/July 2021 - 27
Geosynthetics June/July 2021 - 28
Geosynthetics June/July 2021 - 29
Geosynthetics June/July 2021 - 30
Geosynthetics June/July 2021 - 31
Geosynthetics June/July 2021 - 32
Geosynthetics June/July 2021 - 33
Geosynthetics June/July 2021 - 34
Geosynthetics June/July 2021 - 35
Geosynthetics June/July 2021 - 36
Geosynthetics June/July 2021 - 37
Geosynthetics June/July 2021 - 38
Geosynthetics June/July 2021 - 39
Geosynthetics June/July 2021 - 40
Geosynthetics June/July 2021 - 41
Geosynthetics June/July 2021 - 42
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Geosynthetics June/July 2021 - Cover3
Geosynthetics June/July 2021 - Cover4
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