Underground Construction - August 2021 - 25
projects. FIGURE 4 (A and B) illustrates
some samples of SAPL installation issues.
Development of structural
design equations
Th is task produced design equations for
both polymeric and cementitious types
of SAPLs using data and information
from other tasks of this project, mainly
fi nite element modeling (FEM) and soil
box testing. Th e equations addressed
both circular and arch geometries.
When fi rst existing design methods
were evaluated and analyzed for
their applicability to SAPLs, design
loading, per AASHTO's Load and
Resistance Factor Design (LRFD)
Bridge Design Specifi cations was used.
Th en limitations with existing design
equations were considered and design
thickness results were compared
with the data obtained from the
numerical and experimental studies.
Once the applicable equation was
identifi ed, it was further calibrated using
regression curves to conform with test
results. FIGURE 5 illustrates the design
equation development methodology.
Performance construction
specifi cations
In the absence of standard installation
guidelines, this task investigated and
prepared performance construction
specifi cations based on the outcomes of
the previous tasks to ensure structural
integrity of the SAPL is not jeopardized
due to faulty installation.
Finite element modeling
of renewed corrugated
metal pipes
Th is task included preparation of fi nite
element modelling (FEM) and simulation
of the soil box test results for other
similar conditions. Once the FEM
models were validated with the results
of the soil box, diff erent conditions and
situations were simulated, which were
not considered in the soil box testing.
ABAQUS was used to perform FEM
simulations and analyses.
Th e simulations included three CMP
pipes without linings, three invertFIGURE
5. Design equation development methodology.
FIGURE 6. Finite element modeling of the soil box testing.
FIGURE 7. The CMPs' burial configuration (control test set): (a) plan view, (b) profile view of the
aligned CMPs in the soil box, and (c) cross sectional view of both circular and CMP arch samples.
UCONonline.com | AUGUST 2021
25
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Underground Construction - August 2021
Table of Contents for the Digital Edition of Underground Construction - August 2021
Contents
Underground Construction - August 2021 - Cover1
Underground Construction - August 2021 - Cover2
Underground Construction - August 2021 - Contents
Underground Construction - August 2021 - 4
Underground Construction - August 2021 - 5
Underground Construction - August 2021 - 6
Underground Construction - August 2021 - 7
Underground Construction - August 2021 - 8
Underground Construction - August 2021 - 9
Underground Construction - August 2021 - 10
Underground Construction - August 2021 - 11
Underground Construction - August 2021 - 12
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Underground Construction - August 2021 - Cover3
Underground Construction - August 2021 - Cover4
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