Geosynthetics June/July 2023 - 31

Tchar: characteristic short-term
strength or nominal strength of the
reinforcement
fm: material safety factor to allow
for the strength-reducing effects of
installation damage, weathering,
chemical and other environmental
effects and to allow for the extrapolation
of data required to establish the
reduction factors
RFID: reduction factor for installation
damage
RFW: reduction factor for weathering,
including exposure to ultraviolet light
RFCH: reduction factor for chemical/
environmental effects
fs: factor of safety for the extrapolation
of data
Other reduction factors or additional
factors of safety could be applied
to estimate the design tensile strength,
according to local standards and recommendations.
Usually, the data sheets
provided by the manufacturers present
only the typical values of the characteristic
short-term strength or the nominal
strength (Tchar) of the reinforcement.
However, the reduction factors should
also be requested for design purposes,
as they are material-specific for each
product and manufacturer. These reduction
factors should be certified by an
independent board or agency; otherwise,
general conservative values proposed by
literature should be adopted.
Specification of the
geosynthetic reinforcement
for the BR-101
The cloverleaf road that connects BR-101
to the Florianopolis Ring Road was constructed
on very thick, soft soils and varying
embankment heights, requiring precise
specification of different geosynthetic
reinforcements strength to ensure an optimized
solution for slope stabilization.
1 day
1 month
2 months
1 year
10 years
120 years
This ultimate limit state design result
recommended different geogrid-reinforced
segments, with nominal tensile
strengths between 400 kN/m (27,000
lb/ft) and 1,750 kN/m, totaling 150,000
m² (1,614,586 square feet) of geogrids
for reinforcement, of which 3,600 m²
(38,750 square feet) were specified with a
resistance of 1,750 kN/m (120,000 lb/ft),
the highest strength ever recorded by the
authors for polyester geogrids.
As shown in the cross section on
Figure 5, geosynthetic drains and temporary
surcharge were necessary to accelerate
the settlements expected with the
construction of embankments on soft soil
layers 20 m (66 feet) deep.
strain %
FIGURE 4 Example of a stress/strain isochronous curves graph for a typical polyester geogrid.
(Huesker GmbH, 2001)
FIGURE 5 Cross section of the reinforced embankment (Huesker Ltda., 2021)
GeosyntheticsMagazine.com
31
% of characteristic short-term
tensile strength

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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
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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
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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
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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
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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
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-july-august-2024
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
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-october-november-2023
https://www.nxtbook.com/ata/geosynthetics/geoysynthetics-august-september-2023
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-june-july-2023
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-april-may-2023
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-february-march-2023
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-december-2022-january-2023
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-october-november-2022
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-august-september-2022
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-june-july-2022
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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
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