Geosynthetics April/May 2020 - 10
UPDATE
FIGURE 2 Long-term flow capacity for
multilinear and single-sided geonet
drainage geocomposites
What about the factor
of safety?
While the equation in ASTM D7931 is a
good foundation for drainage geocomposite design, it does not account for
the all-important factor of safety that is
often applied to these types of calculations-likely because this factor of safety
is often based on engineering judgment
and/or industry standard practice.
However, with the 2017 New York State
revisions to the solid waste regulations
(6 NYCRR Part 360), regulated factor
of safety requirements for hydraulic
flow capacity calculations and transmissivities are becoming more common.
The New York regulations currently
require a factor of safety of 3, which can
be a challenge to meet with more commonly used drainage geocomposites.
Specifying a drainage geocomposite
product that has low reduction factors,
like multilinear drainage geocomposites,
could be used to meet these regulated
factors of safety.
Conclusions
ASTM D7931 provides a guideline
for calculating engineering properties
related to drainage geocomposites that
10
can be used by designers and engineers throughout multiple industries.
The calculation methodologies for less
traditional products like multilinear
drainage geocomposites do not change.
Designing with innovative products can
decrease the required transmissivity and
increase the factor of safety of the drainage layer, allowing for opportunities to
meet more stringent regulations.
References
Blond, E., Fourmont, S., and Saunier, P. (2013).
"Biological clogging resistance of tubular drainage
geocomposites in leachate collection layers." Proc.,
Geosynthetics 2013, Long Beach, Calif., 1135-1144.
Fourmont, S., and Koerner, G. (2017). "Determining
the long-term transmissivity of selected drainage
geocomposites to landfill leachate." Proc., Geotechnical
Frontiers 2017, 274-279.
GRI Standard-GC8. (2013). "Determination of the
allowable flow rate of a drainage geocomposite," rev. 1.
Geosynthetic Institute, Folsom, Pa.
Koerner, R. M., and Koerner, G. R. (2007). GSI white
paper #4, "Reduction factors (RFs) used in geosynthetic
design," rev. 1. Geosynthetic Institute, Folsom, Pa.
Saunier, P., Ragen, W., and Blond, E. (2010). "Assessment
of the resistance of drain tubes planar drainage
geocomposites to high compressive loads." Proc., Int.
Conf. on Geosynthetics, Guaruja, Brazil, vol. 3, 1131.
Saunier, P., Steinhauser, E., and Fourmont, S. (2017).
"Statement on the long-term flow rate of tubular
drainage geocomposites to landfill leachate." Proc.,
First Int. Conf. on Technology and Application
of Geosynthetics. G
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Geosynthetics April/May 2020
Table of Contents for the Digital Edition of Geosynthetics April/May 2020
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Geosynthetics April/May 2020 - Cover2
Geosynthetics April/May 2020 - 1
Geosynthetics April/May 2020 - 2
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