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Solution:
Only Keller has a 40-
year track record and thousands
of track miles of experience dealing
with problematic subgrades.
The injection system pictured
here has been used on Class One,
Shortline, and Industry tracks
throughout North America. The
technique has been studied
and accepted by TTCI in Pueblo,
Colorado. Rail subgrade injection
is included in AREMA Chapter
One as well. Recent advances in
the technology provide feedback
on the subsurface conditions
during the injection process.
Recent advances in the grout
mix have allowed treatment of
wider soils types than previously
considered. A side by side comparison
of injection versus the
installation of wood piles was
provided in an AREMA paper and
presentation. This paper was
written with one of our Class
One partners and discusses track
constructed through organic
peat bogs near the US Canadian
border. The injection work was
both more economical and
provided a longer-term solution
than installation of wood piles
at the shoulder. Prior to the injection
treatment, sections of track
required monthly surfacing, if
not more often. These sections
of track have now gone through
four freeze thaw cycles and
are still maintaining geometry
without surfacing.
In addition to treatment of
ballast pockets, we also offer a
variety of geotechnical solutions
for various structural and
track deficiencies related to
geotechnical conditions that
are beyond the scope of general
maintenance of way crews. Our
network of local offices with
experienced geotechnical engineers
have provided solutions to
diverse subgrade problems such
as karstic sinkholes, washouts,
failed abutments and side walls,
ground loss or settlement due to
tunneling or adjacent excavations,
settling of bridges, crane
and hump foundations, slope
and slide repairs, deep foundations
for bridges, and real time
geotechnical and structural
monitoring.
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