Geosynthetics August/September 2022 - 27

FIGURE 1 Geographic
location of the study area.
Photo: Google Maps
Site conditions
The study area resides on a mountainous
topography, has a tropical rainy
climate and has an average height of
2,877 feet (877 m) above sea level. The
geology of the site presents intercalations
of tuffs, shales and ignimbrites.
It has a difference of elevation of 20
feet (6 m) from the highest point and
the lowest point, so the area drains a
lot of surface runoff when it rains. This
runoff has managed to infiltrate the
different strata of the soil, weakening
the mass of soil that has induced movements
on the pavement. The solution to
this condition that was applied when the
section was constructed was to install
small diameter PVC pipe perforated
and wrapped in geotextile on a gravel
bed as an evacuation mechanism for this
runoff, now underground.
The road section was built at hillside
on what appeared to be a deposit of
an old, unconsolidated landslide. Land
exploration work was carried out with 20
foot (6 m) deep open pits prior to the execution
of the wall on an already excavated
platform 13 feet (4 m) high, excavating a
fractured, loose and saturated material of
the same characteristics as the material
of the cutting slope, which indicated the
presence of a material with few geotechnical
characteristics. Unfortunately, the
study area lacked a relevant geotechnical
exploration that faithfully characterized
the terrain, so the information on the
open pits was an added value to the project
execution.
Containment system
The retaining wall system used is formed
by a facade of electro-welded mesh baskets
wrapped by a nonwoven geotextile
and a triaxial geogrid, anchored to the
uniaxial geogrid by a steel rod, which
work together to resist differential seats
and large external loads. These walls
GeosyntheticsMagazine.com
27
The geology of
the site presents
intercalations
of tuffs, shales
and ignimbrites.

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Geosynthetics August/September 2022

Table of Contents for the Digital Edition of Geosynthetics August/September 2022

Geosynthetics August/September 2022 - Cover1
Geosynthetics August/September 2022 - Cover2
Geosynthetics August/September 2022 - 1
Geosynthetics August/September 2022 - 2
Geosynthetics August/September 2022 - 3
Geosynthetics August/September 2022 - 4
Geosynthetics August/September 2022 - 5
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Geosynthetics August/September 2022 - Cover3
Geosynthetics August/September 2022 - Cover4
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https://www.nxtbook.com/ata/geosynthetics/geosynthetics-july-august-2024
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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
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https://www.nxtbook.com/ata/geosynthetics/geosynthetics-april-may-2023
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https://www.nxtbook.com/ata/geosynthetics/geosynthetics-december-2022-january-2023
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https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-december-2021-january-2022
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https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-june-july-2021
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