Geosynthetics June/July 2020 - 25

FIGURE 4 Partially filled top NPA geocell layer

and were rejected. Figure 4 shows the
top layer NPA geocell being stretched
and filled with gravel. Pokharel (2010)
emphasized the importance of compaction in geocell-reinforced structures,
so the right degree of compaction was
always the top priority in order to achieve
the required strength. In subzero temperatures, the nuclear densometer compaction testing did not seem to give accurate
results. Therefore, a controlled volume/
weight method was employed to guarantee that the required degree of compaction was achieved. The pad was divided
into separate blocks and for each block
the required weight of the material for a
specified degree of compaction was calculated, and compaction continued until
the exact compacted thickness of the
fill material was achieved. This method

was utilized for each subsequent layer
of gravel fill to good success and helped
ensure that adequate compaction was
achieved. The structure performed as
expected when the crane was brought
to the site during spring thaw, when soil
conditions are typically expected to be in
their poorest state.
The bottom layer improved the bearing capacity and served as the construction layer for the construction traffic,
which otherwise would have needed layers of wooden mats to pass the truck
traffic. After installation of the top
structural area in some portions of the
pad, a pile-driving rig was allowed to
operate on the pad while installation was
completed in other parts. During this
time no significant rutting or differential settlement of the pad was observed.
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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
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Geosynthetics June/July 2020 - 16
Geosynthetics June/July 2020 - 17
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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
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Geosynthetics June/July 2020 - 35
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Geosynthetics June/July 2020 - 38
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Geosynthetics June/July 2020 - 45
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Geosynthetics June/July 2020 - 47
Geosynthetics June/July 2020 - 48
Geosynthetics June/July 2020 - Cover3
Geosynthetics June/July 2020 - Cover4
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