Geosynthetics February/March 2022 - 29

both during construction and for continued
facility use. The reinforced roadways
were handed over to the Texas
Department of Transportation after the
site development was completed.
FIGURE 9 In situ soils for
Impact Solar project
Conclusion
Geosynthetics provide an economical
option for mechanical stabilization of subgrades
with unsuitable soils both during
construction and to adhere to long-term
performance requirements. With current
national goals for massive solar expansion,
project teams should consider geosynthetic
stabilization of challenging sites
to reduce required resources for site development
and to keep projects on schedule.
The referenced case studies are only two
of many projects where geosynthetics have
provided an enormous cost savings and
long-term solution for site stabilization.
References
ASTM D1883. (D18.05 2018). Standard test method for
California bearing ratio (CBR) of laboratory-compacted
soils. ASTM International. West Conshohocken, Penn.
Christopher, B. R., Perkins, S. W., Lacina, B. A., and
Marr, W. A. (2009). " Pore water pressure influence on
geosynthetic stabilized subgrade performance. " Proc.,
Geosynthetics Conf., Salt Lake City, Utah.
Giroud, J. P., and Han, J. (2004). " Design method
for geogrid-reinforced unpaved roads, Part I:
Theoretical development. " Jour. of Geotechnical and
Geoenvironmental Engineering, 130(8), 776-78.
Giroud, J. P., and Noiray, L. (1981). " Geotextilereinforced
unpaved road design. " Jour. of Geotechnical
and Geoenvironmental Engineering, 107(9), 1233-53.
Jornbey, B., and Hicks, R. G. (1986). " Base course
contamination limits, " in Design and performance of
flexible pavements. Transportation Research Record,
1095, 86-101.
Office of Energy Efficiency and Renewable Energy.
" Solar energy in the United States. " https://www
.energy.gov/eere/solar/solar-energy-united-states.
Pandey, C., and Agarwal, S. (2019). " Comparative
study between soaked and unsoaked value of soil
samples. " International Research Jour. of Engineering and
Technology, 6(6), 3263.
Segrave, K. E. (2019). " Steps taken toward solar farm. "
Chicot Newspaper, Dec. 5. G
>> For more, search stabilization
at www.GeosyntheticsMagazine.com.
Mechanical Properties
Tensile Strength
@ 2% Strain (MD)
Tensile Strength
@ 2% Strain (CD)
Tensile Strength
@ 5% Strain (MD)
Tensile Strength
@ 5% Strain (CD)
Flow Rate
Permittivity
Pore Size (095)
Pore Size (050)
Index Properties
Apparent Opening Size (AOS) ASTM D4751
Interaction Coefficient2
Factory Sewn Seam
UV Resistance
(at 500 hours)
ASTM D6706
ASTM D4884
ASTM D4355
U.S. Sieve (mm)
-
lbs/ft (kN/m)
% strength retained
Test Method
ASTM D4595
ASTM D4595
ASTM D4595
ASTM D4595
ASTM D4491
Unit
lbs/ft (kN/m)
lbs/ft (kN/m)
lbs/ft (kN/m)
lbs/ft (kN/m)
ASTM D4491 gal/min/ft2 (L/min/m2)
sec-1
ASTM D6767
ASTM D6767
microns
microns
Typical Roll Value
840.0 (12.3)
960.0 (14.0)
1980.0 (28.9)
2100.0 (30.6)
85.0 (3463.0)
1.2
Minimum Average
Roll Value
600.0 (8.8)
660.0 (9.6)
1620 (23.6)
1632.0 (23.8)
70.0 (2852.0)1
0.91
Typical Roll Value
273.0
175.0
Maximum Opening Size
40.0 (0.425)
40.0 (0.425)
Minimum Test Value
0.89
2400.0 (35.0)
90.0
1Minimum Average Roll Value (MARV)
2 Interaction coefficient value is for sand or gravel based on testing conducted by SGI Testing Services LLC.
TABLE 2 Performance and index properties of TenCate Mirafi RS280i
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29
FIGURE 10 Reinforced
access road (left) versus
unreinforced conditions
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