Geosynthetics February/March 2020 - 26

U.S. Bank Stadium geosynthetic reinforced stress relief wall

FIGURE 4 Geogrid diversion system assembly

FIGURE 5 Geogrid connection to bridge pile cap

26

Geosynthetics | February March 2020

support the chevron concrete structure.
Multiple horizontally oriented storm and
sanitary pipes were required to be installed
through the face and RSS reinforced fill.
The RSS geogrid reinforcement had to
be diverted around these horizontally
oriented pipes. Several vertically oriented
storm sewer inlets and manholes were
also located within the RSS fill. A geogrid
diversion system, consisting of structural
bars and threaded rods, was designed to
divert the tensile forces in the geogrid
reinforcement to opposite sides of the
structure where the geogrid could be
extended again. Figure 4 shows a geogrid
diversion system being assembled.
A pedestrian bridge to an elevated
stadium entrance was also planned
along the southern portion of the stadium. The piling and pile caps that
supported the pedestrian bridge were
located within the reinforced backfill.
The authors required that the piling be
installed prior to RSS construction so
that the geogrid reinforcement could
be diverted around the piles during
RSS construction. Where the concrete
pile caps interfered with the geogrid
extent, the geogrid was mechanically
connected to the concrete pile caps
using a pipe and rebar anchor system
that was designed to transfer the tensile forces in the geogrid to the concrete cap and piles. An anchor hook was
drilled and grouted into the pile cap, a
3-inch (7.6-cm) diameter pipe installed
in the hooks, and then the geogrid was
wrapped around the pipe and extended
to the required runout length. Figure 5
shows this system.
The 5-foot (1.5-m) void at the top of
the RSS wall was designed to be spanned
with precast panel planks tied to the
stadium foundation wall and then supported on a small footing on the RSS.
Figure 6 shows the completed RSS wall
with the footing for the precast concrete
plank in place.



Geosynthetics February/March 2020

Table of Contents for the Digital Edition of Geosynthetics February/March 2020

Geosynthetics February/March 2020 - Cover1
Geosynthetics February/March 2020 - Cover2
Geosynthetics February/March 2020 - 1
Geosynthetics February/March 2020 - 2
Geosynthetics February/March 2020 - 3
Geosynthetics February/March 2020 - 4
Geosynthetics February/March 2020 - 5
Geosynthetics February/March 2020 - 6
Geosynthetics February/March 2020 - 7
Geosynthetics February/March 2020 - 8
Geosynthetics February/March 2020 - 9
Geosynthetics February/March 2020 - 10
Geosynthetics February/March 2020 - 11
Geosynthetics February/March 2020 - 12
Geosynthetics February/March 2020 - 13
Geosynthetics February/March 2020 - 14
Geosynthetics February/March 2020 - 15
Geosynthetics February/March 2020 - 16
Geosynthetics February/March 2020 - 17
Geosynthetics February/March 2020 - 18
Geosynthetics February/March 2020 - 19
Geosynthetics February/March 2020 - 20
Geosynthetics February/March 2020 - 21
Geosynthetics February/March 2020 - 22
Geosynthetics February/March 2020 - 23
Geosynthetics February/March 2020 - 24
Geosynthetics February/March 2020 - 25
Geosynthetics February/March 2020 - 26
Geosynthetics February/March 2020 - 27
Geosynthetics February/March 2020 - 28
Geosynthetics February/March 2020 - 29
Geosynthetics February/March 2020 - 30
Geosynthetics February/March 2020 - 31
Geosynthetics February/March 2020 - 32
Geosynthetics February/March 2020 - 33
Geosynthetics February/March 2020 - 34
Geosynthetics February/March 2020 - 35
Geosynthetics February/March 2020 - 36
Geosynthetics February/March 2020 - 37
Geosynthetics February/March 2020 - 38
Geosynthetics February/March 2020 - 39
Geosynthetics February/March 2020 - 40
Geosynthetics February/March 2020 - 41
Geosynthetics February/March 2020 - 42
Geosynthetics February/March 2020 - 43
Geosynthetics February/March 2020 - 44
Geosynthetics February/March 2020 - 45
Geosynthetics February/March 2020 - 46
Geosynthetics February/March 2020 - 47
Geosynthetics February/March 2020 - 48
Geosynthetics February/March 2020 - 49
Geosynthetics February/March 2020 - 50
Geosynthetics February/March 2020 - 51
Geosynthetics February/March 2020 - 52
Geosynthetics February/March 2020 - Cover3
Geosynthetics February/March 2020 - Cover4
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