Geosynthetics August/September 2021 - 30

Construction of roads in underground mines with 3D geocells
Further, the work proceeded in a similar
way: successively, the modules were fastened
together and stretched, and, at the
same time, the geocells were backfilled
with crushed stone with a lag of one or
two stretched sections.
Certain modifications have been
FIGURE 3 Reinforced bright-yellow geocells
filled with crushed stone
made to the design of the reinforced
3D geocells especially for underground
mines. The first modification is a bright
yellow color (Figure 3). The standard
color of geocells is black; the laying of
such products may be tricky due to poor
lighting. In addition, the drivers of road
cars will not see the upper boundary of
the geocell layer, and it can be damaged
during construction or road profiling.
The use of yellow in low-light conditions
can show where a protective layer
of crushed stone is required and helps
prevent damage to the cells.
The second important feature of
FIGURE 4 Finished construction: Reinforced
geocells filled with compacted crushed stone
and a drainage ditch on the left
reinforced geocells is the texturing of the
polymer tape on both sides. Texturing
means diamond-shaped indentations
designed to increase the adhesion
between the geocell and crushed stone,
which increases the reinforcement coefficient.
In underground mining roads,
the increased reinforcement coefficient
prevents deformation caused by heavy
equipment on the roads.
To drain water away from the comFIGURE
5 Close up of reinforced geocells filled
with crushed stone
posite layer in underground mining
roads, the cell walls must be perforated
with round holes. Timely drainage prevents
the crushed stone from softening
and pits from forming, which contributes
to the reliability of the road surface. The
importance of perforation, texturing and
rigidity of geocells and the effect of the
parameters that pass the reinforcement
coefficient of road surfaces were examined
in the works of Dobrov and Shkitsky
(2012 and 2014).
After the installation of the geocells,
the pilot site was covered with crushed
stone and, during the next shift, planed
30
Geosynthetics | August September 2021
by a motor grader. On the right side
(downward direction), a drainage ditch
with a width of 16-20 inches (40-50 cm)
was formed (Figure 4).
After that, the area was compacted.
Fully compacted filling material in geocells
is critical to the performance of the
load support system. During the installation
process, two layers of filler are laid:
the main layer that fills the entire height
of the geocell (Figure 5) and the upper
protective layer to cover the geocells.
Both layers should be tramped down by
a compactor.
After commissioning, control of the
road condition at the test site was carried
out for one month: every day by
mine employees and every two weeks by
representatives of the mine's engineering
services.
The site was put into operation immediately
after construction. At the first
stage, saturation of the area with mine
dust and further compaction of the surface
with wheels of equipment moving
around the site were observed. In
addition, in the third week of testing,
the drainage ditches were cleaned, and
the area was additionally leveled with a
motor grader.
At the end of the tests, the pilot section
was a monolithic road structure with
a relatively flat surface.
The tests were considered successful,
and the mining company included the
construction of roads with the reinforced
3D geocell in its budget. To date, more
than 7.5 miles (12 km) of roads with the
reinforced geocell have been built at the
Rasvumchorr and Kirov mines.
From 2018 to 2021, several mining
companies conducted similar tests at
their mines, which resulted in the further
use of reinforced geocells for the construction
of roads in underground mines.
The last improvement of the
reinforced geocell technology is FASTLOCK,
a specially designed fastening

Geosynthetics August/September 2021

Table of Contents for the Digital Edition of Geosynthetics August/September 2021

Geosynthetics August/September 2021 - Cover1
Geosynthetics August/September 2021 - Cover2
Geosynthetics August/September 2021 - 1
Geosynthetics August/September 2021 - 2
Geosynthetics August/September 2021 - 3
Geosynthetics August/September 2021 - 4
Geosynthetics August/September 2021 - 5
Geosynthetics August/September 2021 - 6
Geosynthetics August/September 2021 - 7
Geosynthetics August/September 2021 - 8
Geosynthetics August/September 2021 - 9
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Geosynthetics August/September 2021 - Cover3
Geosynthetics August/September 2021 - Cover4
Geosynthetics August/September 2021 - GeoNashville Attendee Brochure 1
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