eps2011-i15
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Construction and Long-Term Performance of TransportationInfrastructure Constructed Using EPS Geofoam on Soft Soil
Sites in Salt Lake Valley, Utah
S. Bartlett, D. Negussey, C. Farnsworth, A. Stuedlein
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I-15
I-15
I-80
I-80
I-215
I-80
I-215
I-215
I-15
Wasatch
Mountains
Great
SaltLake
Oquirrh
Mountains
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Geotechnical Conditions
Subsurface Profile in Salt Lake Valley
SoftClay (10-
m thick)
0
5
10
15
20
25
30
35
40
0 5000 10000 15000 20000 25000 30000 35000 40000
CPT Tip Resistance, kPa
Depth(m)
Bonneville Clay
Alluvium
Pleistocene Alluvium
Cutler Clay
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Geotechnical Conditions
Settlement Record
12 m
1.4 m
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Geotechnologies
PV Drains
2-Stage MSE Walls
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Geotechnologies
Lime Cement ColumnsEPS Geofoam
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Geofoam Placement Areas
500 N
100 S
400 S
900 S
1300 S
State St
2100 S
3300 S
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Primary Uses of Geofoam on the I-15 Project
Reduce Settlement to Protect Buried Utilities
Improve Slope Stability of Embankments
Rapid Construction in Time Critical Areas
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EPS Density
Property ASTMTest
C 578
T e XI T e I T e VIII* Type II Type IX
NominalDensity
(kg/m3)
C303 / D1622 12 16 20 24 32
Minimum
Density
(kg/m3)
C303 / D
1622
11 15 18 22 29
* Type VIII was used for I-15 Reconstruction
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Geotechnical Instrumentation
VW Pressure Cells
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Geotechnical Instrumentation
Magnet Extensometers
LEVEL 0
LEVEL 4
LEVEL 2
LEVEL 6
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Geotechnical Instrumentation
Horizontal Inclinometer
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Geotechnical Instrumentation
Surveying
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100 South Instrumentation Array
500 N
100 S
400 S
900 S
1300 S
State St
2100 S
3300 S
100 South
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100 South Array
(Construction)
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100 South Array
(cross-section view)
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100 South Array
(profile view)
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100 South Array
(Load and Pressure Cells)
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100 South Array
(Vertical Strain)
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100 South Array
(Creep Settlment)
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3300 South Array
(Construction)
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3300 South Geofoam Array
(Cross-Sectional View)
h
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3300 South Array
(Load and Pressure Cells)
h
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3300 South Array
(Vertical Settlement / Strain)
1 % vertical strain (end of construction)
3300 S h A
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3300 South Array
(Creep Settlement)
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State Street Instumentation
500 N
100 S
400 S
900 S
1300 S
State St
2100 S
3300 S
State Street
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State Street Construction
State Street Array
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State Street Array
St t St t A
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State Street Array
(Pressure Cells Measurements)
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Geotechnologies Settlement Performance
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Conclusions
EPS geofoam exhibited the best overall settlement performance
of the I-15 geotechnologies
Compression, seating and inter-block gap closure of EPS
produced about 1 percent vertical deformation during
construction loading.
Vertical pressure levels are in reasonable agreement with
allowable design limits of about 30 kPa.
I-15 EPS embankment has undergone about 0.2 to 0.4 percent
creep deformation in a 10-year post construction period.
The 10-year design criterion has been met and the 50-year design
criterion of 1.5 percent total strain will most likely be met.
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