Geosynthetics June/July 2019 - 19

maximum earthquake acceleration of
0.45 g is recommended for design of
critical facilities at the Cortez Hills site.
The MSE wing walls were designed using
the operating basis earthquake (OBE) for
the lower-level event. The OBE acceleration of 0.18 g is approximately one-third
larger than the maximum historical site
acceleration and slightly larger than the
U.S. Geological Survey estimate of the
475-year acceleration.
The wire-faced MSE walls were
designed to create a safe area for unloading mine trucks and provide stabilized
access to the crusher. At its highest section, the MSE wall is approximately 95
feet (29 m) tall, including 2H:1V slope on
the top, as shown in Figure 4.
The MSE walls were constructed with
multiple layers of primary reinforcement
using three different types of uniaxial
polyester geogrids to optimize the overall cost of the system. The geogrids were
installed at the mid-height of the MSE
wall fascia units. The double-twisted wire
mesh from the fascia units were extended
9 feet (2.7 m) into the reinforced fill as secondary reinforcements. The MSE wing
walls were designed to support the live
load of Liebherr T282 B mine trucks,
which can generate a loaded weight of
approximately 653 tons (592 tonnes)
and withstand the vibratory loading
during the crushing operation. Proper
selection, placement and compaction
of the fills were required to reduce the
potential for excessive settlement of
the pads, to reduce the lateral pressures
on the crusher structure and to obtain
proper performance of the MSE wallreinforcement system. Select structural
fill material was used as reinforced fill
behind the crusher, around buried utilities, for the MSE wall, as leveling fill
beneath foundations and to surface the
pads. Figures 5 and 6 show the MSE
wall system facing detail and postconstruction, respectively.

FIGURE 5 Cortez Hills Mine Crusher MSE wall facing detail

FIGURE 6 Cortez Hills Mine Crusher MSE wall postconstruction

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Geosynthetics June/July 2019

Table of Contents for the Digital Edition of Geosynthetics June/July 2019

Geosynthetics June/July 2019 - Cover1
Geosynthetics June/July 2019 - Cover2
Geosynthetics June/July 2019 - 1
Geosynthetics June/July 2019 - 2
Geosynthetics June/July 2019 - 3
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Geosynthetics June/July 2019 - Cover3
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