Geosynthetics June/July 2023 - 32

Embankment reinforcement using 1750 kN/m strength geogrids
Specified tensile
strength (lb/ft)
137000
82200
54800
41100
27400
TABLE 1
Total reduction
factor used in
the design
2
2
2
2
2
Design tensile
strength (lb/ft)
68500
41100
27400
20550
13700
Strength calculated
with the Fortracspecific
reduction
factors (BBA 13/
H197), 60 years
118916
71309
47539
35689
23770
An important technical study carried
FORTRAC T
tensile strength
specification (lb/ft)
120000
75400
48000
37700
24000
out to optimize the supply of geogrids
was related to the reduction factors provided
by the designer. Initially, the projects
indicated a value of 2.0 for the total
reduction factor (TRF) of the geogrids,
based on literature recommendations.
However, the polyester geogrids manufactured
by HUESKER Synthetic GmbH
have reduction factors certified by the
British Board of Agrement (BBA 13/
H197-2014), obtained by tests carried out
on samples from the batches of geogrids
produced, resulting in individualized
values, which reflect better long-term
performance for each product tested.
With these product-specific values,
and design life span of 60 years, a new,
optimized global reduction factor FRglobal
of 1.74 was adopted using the following
partial reduction factors:
* Reduction factor for fluency (60
years): FRf = 1.50
* Reduction factor for mechanical
damage (60 years): FRdm = 1.05 for
installation in sand or gravel
* Reduction factor for chemical and
environmental damage (60 years):
FRch = 1.03, for 4 ≤ pH ≤ 9
* Safety factor by extrapolation of
creep data (60 years): γ= 1.07, for 4
≤ pH ≤ 9
Table 1 presents the equivalence of
FIGURE 6 Tensile strength test report for the 1750 kN/m
(120,000 lb/ft) geogrid. (Huesker GmbH, 2021)
the nominal tensile strengths originally
indicated in the design and the values
adopted for the supply of geogrids,
using the reduction factors certified
by BBA.
Geogrids supply
and construction
Upon completion of the optimization
studies for the reduction factors of the
geosynthetic reinforcements and approval
of the new specifications, customized
reinforcement geogrids, specifically for
32
Geosynthetics | June July 2023

Geosynthetics June/July 2023

Table of Contents for the Digital Edition of Geosynthetics June/July 2023

Geosynthetics June/July 2023 - Cover1
Geosynthetics June/July 2023 - Cover2
Geosynthetics June/July 2023 - 1
Geosynthetics June/July 2023 - 2
Geosynthetics June/July 2023 - 3
Geosynthetics June/July 2023 - 4
Geosynthetics June/July 2023 - 5
Geosynthetics June/July 2023 - 6
Geosynthetics June/July 2023 - 7
Geosynthetics June/July 2023 - 8
Geosynthetics June/July 2023 - 9
Geosynthetics June/July 2023 - 10
Geosynthetics June/July 2023 - 11
Geosynthetics June/July 2023 - 12
Geosynthetics June/July 2023 - 13
Geosynthetics June/July 2023 - 14
Geosynthetics June/July 2023 - 15
Geosynthetics June/July 2023 - 16
Geosynthetics June/July 2023 - 17
Geosynthetics June/July 2023 - 18
Geosynthetics June/July 2023 - 19
Geosynthetics June/July 2023 - 20
Geosynthetics June/July 2023 - 21
Geosynthetics June/July 2023 - 22
Geosynthetics June/July 2023 - 23
Geosynthetics June/July 2023 - 24
Geosynthetics June/July 2023 - 25
Geosynthetics June/July 2023 - 26
Geosynthetics June/July 2023 - 27
Geosynthetics June/July 2023 - 28
Geosynthetics June/July 2023 - 29
Geosynthetics June/July 2023 - 30
Geosynthetics June/July 2023 - 31
Geosynthetics June/July 2023 - 32
Geosynthetics June/July 2023 - 33
Geosynthetics June/July 2023 - 34
Geosynthetics June/July 2023 - 35
Geosynthetics June/July 2023 - 36
Geosynthetics June/July 2023 - 37
Geosynthetics June/July 2023 - 38
Geosynthetics June/July 2023 - 39
Geosynthetics June/July 2023 - 40
Geosynthetics June/July 2023 - 41
Geosynthetics June/July 2023 - 42
Geosynthetics June/July 2023 - 43
Geosynthetics June/July 2023 - 44
Geosynthetics June/July 2023 - Cover3
Geosynthetics June/July 2023 - Cover4
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-december-2024-january-2025
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-october-november-2024
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https://www.nxtbook.com/ata/geosynthetics/geosynthetics-case-studies-guide-2024
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-april-may-2024
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-february-march-2024
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-december-2023-january-2024
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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
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