Page 23 - LWFC Catalog

PRESENTATION ABSTRACTS
PRESENTATION ABSTRACTS

avoiding the need for long-term bypass pumping. Global Underground performed the sliplining
via horizontal directional drilling equipment, pulling in approximately 1.67M pounds of pipe over
43 days. After sliplining was complete, Cematrix Cellular Concrete Solutions performed annulus
grouting using low density cellular concrete. The grout had a unit weight of 30 pcf with a minimum
compressive strength of 100 psi. Approximately 7,400 cubic yards of grout was placed over 15
days. This presentation focuses on the steps taken to mitigate the challenges associated with
grouting long distances with limited access in a relatively flat tunnel. Initially, only the portals and
four ventilation shafts were available for grout injection, which at a spacing of approximately
1,500 feet proved to be too long for full encapsulation of the pipe. Nine new grout injection
points were drilled into the tunnel, which reduced the injection point spacing to less than 500 feet,
allowing for successful completion of grouting.

11AM - Behavior of Reinforced Lightweight Cellular Concrete Retaining Structures Subjected to
11:50AM Cyclic Loading The increased use of reinforced lightweight cellular concrete retaining walls in
regions prone to seismic activity necessitates an understanding of the behavior of these structures
when they are subjected to cyclic loads. This study presents the results of shake table testing
conducted on model reinforced lightweight cellular concrete retaining walls. The models tested
consisted of a 1.8 m long by 1.2 m wide by 1.2 tall block of LCC material with a unit weight of
approximately 4 kN/m3. They were reinforced with a geo-grid layer at a height of 0.6 m and
instrumented with a series of accelerometers and strain gauges at different depths. On the shake
table, the model reinforced lightweight cellular concrete retaining walls were subjected to cyclic
loading applied in the form of sinusoidal waves with varying amplitudes and frequencies. In
addition, the response of the models when they were subjected to the ground motions recording
during the 1994 Northridge Earthquake was also examined. Based on the results obtained from the
instrumentation and visual observation
during the testing, it was evident that AERLITE-R ™
the model reinforced lightweight cellular
concrete retaining walls experienced rigid Low-Density Cellular Concrete (LDCC)
body motion. No relative deformations
were noted between the LCC material DESIGNED SPECIFICALLY FOR ANNULAR FILLS
and the geo-grid layer. Furthermore, the
cyclic loading applied did not induce • High Pumpability
any fractures in the model reinforced • Pumped under low
lightweight cellular concrete retaining pressures and at
greater distances
walls. than any other
material
11AM - Early Experiments with Light Fill in • Reduces lateral
11:50AM the Squeezing Ground Conditions of loads on the new
pipe and the
a Deep Potash Mine Saskatchewan bulkheads
potash mines are at depths where the • Broad spectrum
overburden load is at or exceeds the of densities and
long term strength properties of the salt. compressive
Openings are therefore subject to a strengths
significant amount of deformation and • Self-leveling & self-
room closure. Closure rates decrease compacting
over time but are relentless and
openings can completely close. The
industry has developed techniques and
mining sequences which allow openings
to be maintained for many years.
Notwithstanding these methods there
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