Geosynthetics June/July 2020 - 16

Assessment of condition of an uncovered geosynthetic landfill bottom liner system

2.930

0.015

0.070

0.090

6a

6b
FIGURES 6a and 6b Schematic (a) section (dimensions
in meters) and photograph (b) of wedge

16

(90 m) along the width of the east slope.
At the deepest section (i.e., 3.5-inch [90mm] depth) of the feature, the wedge
extended 9.6 feet (2.93 m) up the slope
from the toe. Figures 6a and 6b present
a schematic and a photograph of the
section of the wedge with the maximum
depth near the toe. Samples obtained
from several locations along the upper
parts of the slopes and from near the toe
location along the south slope indicated
significant loss of bentonite with limited
and, in some cases, nearly no bentonite present between the two nonwoven
geotextile sheets (Figure 7).
Accumulation of the subgrade soil
between the geomembrane and the
GCL forming a mountain shape was
observed near the toe of the slope at
the cell corner between the east and
south slopes. The mountain feature had
a peak thickness (6.3 inches [160 mm])
with lower thickness zones above and
below the peak along the slope. The
length of the mountain along the slope
was 8.6 feet (2.63 m). Overall, the lateral extent of subgrade soil accumulation in the mountain feature was more
localized, and the total amount of soil
accumulated was lower compared to the
bentonite accumulation in the wedge
feature. Figure 8 presents a schematic
of the mountain.
The observations made during the
exhumation process were in part similar to those reported in literature (e.g.,
Koerner and Koerner 2005a and b, Thiel
and Rowe 2010, Take et al. 2015). The
seam separations likely were caused
by shrinkage of the bentonite in the
GCLs and tensioning (i.e., necking) of
the GCLs along the long length of the
slopes. In general, the subgrade soil
underneath the GCL at the site was
observed to be dry, with the exception
of near-toe locations. The GCL was in
intimate contact with the underlying
soil, with no separation between the

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Geosynthetics June/July 2020

Table of Contents for the Digital Edition of Geosynthetics June/July 2020

Geosynthetics June/July 2020 - Cover1
Geosynthetics June/July 2020 - Cover2
Geosynthetics June/July 2020 - 1
Geosynthetics June/July 2020 - 2
Geosynthetics June/July 2020 - 3
Geosynthetics June/July 2020 - 4
Geosynthetics June/July 2020 - 5
Geosynthetics June/July 2020 - 6
Geosynthetics June/July 2020 - 7
Geosynthetics June/July 2020 - 8
Geosynthetics June/July 2020 - 9
Geosynthetics June/July 2020 - 10
Geosynthetics June/July 2020 - 11
Geosynthetics June/July 2020 - 12
Geosynthetics June/July 2020 - 13
Geosynthetics June/July 2020 - 14
Geosynthetics June/July 2020 - 15
Geosynthetics June/July 2020 - 16
Geosynthetics June/July 2020 - 17
Geosynthetics June/July 2020 - 18
Geosynthetics June/July 2020 - 19
Geosynthetics June/July 2020 - 20
Geosynthetics June/July 2020 - 21
Geosynthetics June/July 2020 - 22
Geosynthetics June/July 2020 - 23
Geosynthetics June/July 2020 - 24
Geosynthetics June/July 2020 - 25
Geosynthetics June/July 2020 - 26
Geosynthetics June/July 2020 - 27
Geosynthetics June/July 2020 - 28
Geosynthetics June/July 2020 - 29
Geosynthetics June/July 2020 - 30
Geosynthetics June/July 2020 - 31
Geosynthetics June/July 2020 - 32
Geosynthetics June/July 2020 - 33
Geosynthetics June/July 2020 - 34
Geosynthetics June/July 2020 - 35
Geosynthetics June/July 2020 - 36
Geosynthetics June/July 2020 - 37
Geosynthetics June/July 2020 - 38
Geosynthetics June/July 2020 - 39
Geosynthetics June/July 2020 - 40
Geosynthetics June/July 2020 - 41
Geosynthetics June/July 2020 - 42
Geosynthetics June/July 2020 - 43
Geosynthetics June/July 2020 - 44
Geosynthetics June/July 2020 - 45
Geosynthetics June/July 2020 - 46
Geosynthetics June/July 2020 - 47
Geosynthetics June/July 2020 - 48
Geosynthetics June/July 2020 - Cover3
Geosynthetics June/July 2020 - Cover4
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
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-april-may-2022
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
https://www.nxtbook.com/ifai/geosynthetics/1020GS
https://www.nxtbook.com/ifai/geosynthetics/0820GS
https://www.nxtbook.com/ifai/geosynthetics/0620GS
https://www.nxtbook.com/ifai/geosynthetics/0420GS
https://www.nxtbook.com/ifai/geosynthetics/0220GS
https://www.nxtbook.com/ifai/geosynthetics/1219GS
https://www.nxtbook.com/ifai/geosynthetics/1019GS
https://www.nxtbook.com/ifai/geosynthetics/0819GS
https://www.nxtbook.com/ifai/geosynthetics/0619GS
https://www.nxtbook.com/ifai/geosynthetics/0419GS
https://www.nxtbook.com/ifai/geosynthetics/0219GS
https://www.nxtbook.com/ifai/geosynthetics/1218GS
https://www.nxtbook.com/ifai/geosynthetics/1018GS
https://www.nxtbook.com/ifai/geosynthetics/0818GS
https://www.nxtbook.com/ifai/geosynthetics/0618GS
https://www.nxtbook.com/ifai/geosynthetics/0418GS
https://www.nxtbook.com/ifai/geosynthetics/0218GS
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