Geotextiles for Base Reinforcement · Geotextiles for Base Reinforcement by Ron Anderson, P.E....
Transcript of Geotextiles for Base Reinforcement · Geotextiles for Base Reinforcement by Ron Anderson, P.E....
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Geotextilesfor
Base Reinforcement
byRon Anderson, P.E.Tensar CorporationIdaho Falls, Idaho
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Geosyntheticsfor
Base Reinforcement
byRon Anderson, P.E.Tensar CorporationIdaho Falls, Idaho
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Subgrade
Base
Unpaved Road Without Geosynthetic(s)
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Subgrade
Base
Unpaved Road With Geosynthetic(s)
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Geotextiles
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Geogrids - Woven
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Geogrids - Welded
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Geogrids – Extruded
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…near a livestock feedlot.
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…near a commercial dairy.
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…during wind tower construction
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How much cut/agg is enough?
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EXAMPLE
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@ C = 1.7 psi…
29 in.26 in.
21 in.
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A Typical Thickness Relationship…
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What About Separation?
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Geosynthetic Functions Separation:
• Preventing the intermixing (contamination) between two dissimilar materials.
Filtration:• Allowing the free flow of water while
holding back erodible fines.
• Reinforcement:• Mechanically improving the engineering
properties of soils and aggregates.
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Immobilization at Interfaceis Key!
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A Sieve Analysis of Tennis Balls…
Particle Size Distribution
0
20
40
60
80
100
0.0010.010.1110100
Grain Size (mm)
% F
iner
by
Wei
ght
65 mm Uniform Diameter
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… and also MarblesParticle Size Distribution
0
20
40
60
80
100
0.0010.010.1110100
Grain Size (mm)
% F
iner
by
Wei
ght
13 mm (1/2 in) Uniform Diameter
5x
65 mm (2-1/2 in)
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Subgrade Particles Cannot Infiltrate Aggregate Fill Just as Marbles Cannot Infiltrate Tennis Balls.
Particle Size Distribution
0
20
40
60
80
100
0.0010.010.1110100
Grain Size (mm)
% F
iner
by
Wei
ght
5x
5x
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Filter Criteria For Clayey Subgrades:
For Silty Subgrades:
5 DDRatio Piping
s
f
85
15
5 DDRatio Piping
s
f
85
15
25 DDRatio Size Average
s
f
50
50
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Geogrid alone w/ Agg Base (Typ.)
See “Geogrid Separation” paper.
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So if Water is Present and Filter Criteria are Not Satisfied…
(1) Consider an Alternative (i.e. Sandier) Aggregate Fill, at Least for the First Lift.
(2) Consider a Nonwoven Geotextile Beneath the Geogrid, but Only if the Subgrade is Not Silty.
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EconomicsSay Agg Base (Installed) = $15 / ton = $0.75 per sy-inand Say Undercut = $3.60 / cy = $0.10 per sy-inGeotextile (Installed) ~ $1.70 per syGeogrid (Installed) ~ $5.50 per sy
“Break-Even” Thicknesses:Geotextile: $1.70 / ($0.75 + $0.10) = 2 inchesGeogrid: $5.50 / ($0.75 + $0.10) = 6-1/2 inches
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@ C = 1.7 psi…
29 in.26 in.
21 in.
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Call to Action Quantify Subgrade Strength. Consider Loading & Serviceability. Apply Credible Thickness Criteria. Check Separation/Filtration. Call for Pricing; Site Service.
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Questions?
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Proper Installation is Critical Guide Addresses:
Getting StartedSite PreparationPlacing / OverlappingTensioning GeogridPlacing Aggregate FillCompacting FillSpecial ConsiderationsEstimating Tools
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Summary of Installation Parameters Parameters are a
function of subgrade strength.
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