Geosynthetics August/September 2022 - 32

Building a reinforced soil wall with geogrids at hillside
1
4
2
of the value of the safety factor due to
the global stability of the MSE wall in
the dynamic analysis. By not including
the natural guard at the foot of the MSE
wall, we eliminated a counterweight that
could possibly reduce the destabilizing
forces increased by the heavier specific
weight of the Sierra material (21 KN/
m3) in comparison with the volcanic
tuff which has a lighter specific weight
(14 KN/m3). Even though the Sierra
material has a better workability for the
compaction process, the volcanic tuff
represented a better option in factor of
safety terms.
Comparing a conventional concrete
wall, with specific weight greater
than the Sierra material (25KN/m3 >
21 KN/m3), the better solution in this
case was the MSE wall reinforced with
geogrids and using a volcanic tuff as
filling material.
5
Acknowledgements
To the company ICA Inversiones and
Mariana Stafford from Tensar International
for the support and facilities to
receive the field information and bibliography
used in this document.
3
6
FIGURE 7 Construction process of the MSE wall reinforced with geogrids
References
Federal Highway Administration, FHWA-NHI-00-043.
(2001). " Mechanically stabilized earth walls and
reinforced soil slopes, design and construction
guidelines, " NHI Course No. 132042.
Federal Highway Administration, FHWA-NHI-07-092
(2008). " Geosynthetic design and construction
guidelines, " NHI Course No. 132013.
Tensar International. (2010). " TensarSlope analysis
program for reinforced slopes & walls user's manual for
version 1.10. "
Tensar International. (2010). " TensarSoil MSE design
program AASHTO and NCMA wall design methods. " G
>> For more, search " MSE walls "
at GeosyntheticsMagazine.com.
32
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