Geosynthetics June/July 2020 - 14

Assessment of condition of an uncovered geosynthetic landfill bottom liner system

FIGURE 3 Scaled diagram of GCL panels
FIGURE 4 Photograph of
gap between GCL panels

14

After the removal of the geomembrane, the condition of the GCL liner
was assessed starting with an evaluation of the seams. GCL seams along the
east and south slopes of the landfill cell
were investigated during exhumation. A
scaled drawing of the GCL panels along
the east and south slopes is presented in
Figure 3. The length of the seams and
dimensions of the seam gaps (length
along the slope direction and width perpendicular to the slope direction) were
measured for each seam. Of 43 panel
seams, seam separation was observed
at eight locations, along seven separate
seams (i.e., one seam had two distinct
zones of separation). The minimum
seam separation was 0.8 inch (20 mm)
in width, whereas the maximum separation was 8.7 inches (220 mm) in width.
The length of the seam separation zones
along the direction of the slopes ranged
from 5.6 to 55.8 feet (1.7 to 17 m). The
zones of seam separation were along
the upper half of the slope length, with
distances from the crest of the slope to
onset of seam separation ranging from 3
to 46 feet (0.9 to 14.0 m). A photograph
of one panel with a wide seam separation is presented in Figure 4.
While the condition of the geomembrane appeared relatively uniform in the
cell, the condition of the underlying GCL
was observed to be variable. The GCL
was dry near the top and relatively wet at
the bottom of the east slope. Less variation of the moisture content of the GCL
was present along the south slope. In all
cases for upper portions of the slopes,
the bentonite in the GCL was generally
partially hydrated, maintaining a granular consistency. The bentonite core of the
GCL had macrocracks in these cases. At
lower elevations along the slopes where
the GCLs were wetter, the bentonite generally had a gel structure.
Migration of bentonite and accumulation of bentonite between the

Geosynthetics | June July 2020

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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
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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
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