POWER October 2010 - 80

PLANT CONSTRUCTION
9. Lining up. A soldier pile wall was used
for the lower excavation for the new rotary
car dumper. Total excavation was about 20 m
deep. Courtesy: Bechtel Power Corp.
10. Running on time. The completed rotary
car dumper is ready to unload unit train
coal deliveries. Courtesy: Bechtel Power Corp.
After the initial portion of the excavation
work was started, groundwater flow was found
to be a bigger problem than anticipated. This
was considered highly significant, because the
flow could make the upper slopes unstable,
and such instability could endanger the rail
line that provided the sole source of coal to
the existing plant. As a result, work was halted
and plans were made to install both an upper
soldier pile and lagging wall and a dewatering
system. The soldier pile system incorporated a
single level of earth anchors.
Once the upper portion of the excavation
Figure 8 shows four levels of tiebacks installed.
The original design of the slurry wall
system called for placement of five levels of
anchors; however, a reevaluation made during
excavation indicated that the bottom level
of anchors could be eliminated by allowing
the bottom concrete mat to pick up the loading
that would have been transferred to the
fifth level of anchors.
Rotary Car Dumper
The existing plant was originally constructed to
accept coal deliveries by ship. Facilities for rail
delivery, added as part of the OCCP addition,
included replacement of the existing railcar
unloader with a new rotary car dumper (RCD)
constructed adjacent to the old unloader.
Slurry wall-type construction was originally
planned for the 20-m-deep excavation for the
RCD. Later, the excavation plans were modified
for an open excavation of the upper, larger portion
of the RCD and for use of a soldier pile and
lagging wall for the lower, smaller portion of the
building. The plan also assumed that groundwater
could be handled using a series of sumps and
pumps, due to the clayey nature of the soils.
was completed and stabilized, soldier piles
for the lower excavation were installed
along with a second level of dewatering
wells. After these installations, excavation
was completed down to its base, as can be
seen in Figure 9. The completed RCD is
shown in Figure 10. ■
The authors appreciate the support from
Bechtel project management and We Energies
in the preparation of this article.
-K.R. Bell, PhD, PE (krbell@bechtel
.com) is chief engineer, Geotechnical &
Hydraulic Engineering Services, and J.R.
Davie, PhD, PE (jdavie@bechtel.com) is
geotechnical engineering supervisor for
Bechtel Power Corp.
For more information please visit www.maps.platts.com
80
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POWER | October 2010
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POWER October 2010

Table of Contents for the Digital Edition of POWER October 2010

Contents
POWER October 2010 - Cover1
POWER October 2010 - Cover2
POWER October 2010 - Contents
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