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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Geosynthetics for Erosion Control and
Reinforcement
Stan Boyle, Ph.D., P.E.Shannon & Wilson, Inc.
December 5, 2013
What are Geosynthetics?
Geosynthetics are (generally) polymericproducts used in civil
engineering applications. Including: erosion control products,
geotextiles, geogrids, geonets,
b th ti l ligeomembranes, geosynthetic clay liners, geocells,
geocomposites, and geofoam.
Geosynthetics are (generally) polymericproducts used in civil
engineering applications. Including: erosion control products,
geotextiles, geogrids, geonets,
b th ti l li
What are Geosynthetics?
geomembranes, geosynthetic clay liners, geocells, geocomposites,
and geofoam.
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Erosion Control
Nonwoven Geotextiles
• Filter Fabrics• Separation Fabrics• Drainage• Root
barriers
Woven Geotextiles
• Separation Fabrics• Silt Fence• Root barriers•
Reinforcement
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Geogrids
• Reinforcement
Geocells
• Erosion control• Reinforcement• Soil confinement• Planting
cells
Erosion Control
• Temporary – (straw and coir mats)• Moderate Term – Net and
natural fiber• Long Term – all polymer, 3-D
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Erosion Control
Erosion Control
• Temporary – (straw and coir mats)• Moderate Term – Net and
natural fiber• Long Term – all polymer, 3-D
Erosion Control
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Erosion Control
Erosion Control
• Temporary – straw and coir mats• Moderate Term – Net and
natural fiber• Long Term – all polymer, 3-D
Erosion Control
High velocity flow – channels, steep slopes, pond spillways
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Silt Fence
•Woven Geotextile
Root Barrier
•Woven or Nonwoven Geotextile•Horizontal or vertical•Water flow
through
Root Barrier
Needlepunched Nonwoven Geotextile
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Geocell Erosion Control
Steep slopes, water quality ponds, paths
Geocell Erosion Control
Geocell Erosion Control
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Geocell Erosion Control
Reinforced Slopes and Walls
•Horizontal layers of geosynthetic reinforcement•Geotextile or
Geogrid•Face stabilization crucial
• VegetationE i t l th ti• Erosion control geosynthetics
• Wire-basket – vegetation, rock-filled• Rockery
Vegetated Reinforced Slopes
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Wrapped Face Vegetated RSS
1.5H to 1.2H:1.0V
Vegetated Reinforced Slopes
Stacked, 4-inch thick x 18 inch deep turf
0.75H:1.0V
Vegetated Reinforced Slopes
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Vegetated Reinforced Slopes
1.2H:1.0V
Vegetated Reinforced Slopes
1.2H:1.0V3 years later
Erosion control mat visible where vegetation not
established
Reinforced Slopes - Geogrid
1.5H:1.0V
Used Erosion control mat
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Reinforced Slopes – Geogrid(10 yrs later)
Geogrid visible where concentrated runoff eroded surface
Wire-basket Face Reinforced Walls
>0.5H:1V
Rockery-faced Reinforced Wall
~0.5H – 0.75H:1.0V
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Rockery-faced Reinforced Wall
Reinforced Soil Slope Challenges1.2H:1.0V
Heavy runoff before vegetation established.
Vegetated RSS Challenges1.0H:1.0V
Did not irrigate and maintain until plants established.Seeds
mixed into soil? Sufficient organic material?
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Vegetated RSS Challenges
Vegetated RSS Challenges1.0H:1.0V
Slope too steep – should have used a wrapped face or wire basket
face. Topsoil spread on steep surface.
Vegetated Reinforced Wall Challenges
Looks OK from angle. Not full coverage looking straight on.
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Vegetated Reinforced Wall Challenges
10 years later
Did not mix seed into soil. Insufficient organic material.
Shaded. North facing.
Geocell Reinforced Slopes and Walls
Available in Black, Tan, Green
Geocell Wall
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Reinforced Slopes – Geocell Faced
ORDINARYHIGH WATER
MARK
CROSS SECTION B-B'
80
40
60
20
100
BNorthwest
0
80
40
60
20
100
BSoutheast
0
Elev
atio
n in
Fee
t
Elev
atio
n in
Fee
t
0+00 1+00 2+00 3+00
EXISTING GRADE
EMBANKMENT FILL
FINISHED GRADE
18 INCH SD
CLEANOUT
SUBGRADE DRAIN
RIPRAP
Geocell Reinforced and Faced Slope
Geocell soil f
Planting Benches
reinforcement
Geogrid Reinforced Geocell Slope
Planting Pockets
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Reinforced Slopes - Geocell
Place Geocell
Grade
Geogrid-Reinforced Geocell Slope
REPEATGeogrid
Geogrid Reinforced Geocell Faced Slope
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Geogrid Reinforced Geocell Faced Slope
Contour slope facePlace around existing features
•Erosion Control• Natural• Temporary• Permanent
•Reinforcement• Geotextile• Geogrid• Geocell
Summary
• Permanent• 3D• Geocell
•Silt Fence•Root Barrier
• Nonwoven Geotextiles• Woven Geotextiles
Geocell•Facing
• Vegetation• Vegetated wrapped face• Vegetated wire basket•
Rock-filled Basket• Rockery• Geocell
International Erosion Control Association – Geosynthetics
2015
Portland, Oregon
The North American Geosynthetics Society
Manufacturer, Supplier, Contractor Exhibits• Technical sessions,
lectures • Networking
Feb. 15-18, 2015 Portland, Oregon
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Boyle - Geosynthetics for Erosion Control and Reinforcement
December 5, 2013
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Resources
Thanks to:
Propex propexglobal.comACF West acfwest.com
QUESTIONS?
TenCate/Mirafi tencate.com
Stan Boyle, Ph.D., P.E.Shannon & Wilson, Inc.
December 5, 2013
