RSS Construction in Bosnia-Herzegovina

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RSS Construction in Bosnia-Herzegovina
David A. Kaulfers, P.E. Assistant State Materials
Engineer Virginia Department of Transportation
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Where is Bosnia
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Where is Bosnia???
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West Virginia????
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US Sector
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Why are we in Bosnia?

• In December 1995 the Dayton Peace Accord signed
  and shortly thereafter the US crossed the Sava
  and was supposed to be out in one year
• To provide stability in an area of the world that
  historically has been contentious
• The mission is not yet complete

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Why am I talking about Bosnia?

• In November 2000, my Army Reserve Unit was
  involuntarily activated for peacekeeping duties
  in Bosnia from March to September
• My job was the Construction Management Officer
  for all Soldier Construction Projects

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Army Engineer Team

• HQ Staff 3ID Engineers from Ft Stewart
• Engineer Company C/448th ENG GaARNG
• Earthmoving Platoon 92 Engineer Bn from Ft.
  Stewart
• Construction Management 416th Engineer Command,
  USAR

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Army Engineers Job
Maintain Freedom of Movement for Stabilization
Forces in the US Sector
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My Job
Construction Management Officer Perform
Reconnaissance, Scope Out, Design, Plan, Procure
Construction Materials and Provide Construction
Oversight for all Soldier Constructed Projects
in the US Sector
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Route Georgia Landslide
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Corrective Considerations

• Hesco-Bastion Retaining Wall
• Concrete Gravity Retaining Wall
• Timber Crib Retaining Wall
• Reinforced Soil Slope

NO BORINGS!!!!
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Design Approach

• KEEP IT SIMPLE
• Used RSS for Design and estimated conservative
  soil properties
• Specified materials that were easy to work with
  and obtain
• Use Power Point for Design

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Route Georgia Slope Correction Limits of Repair
100
Reflector
Reflector
Culvert
4.0 m
110
Limits of Repair
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Approximate Limits of Failure
120
130
140
46
150
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Route Georgia Slope CorrectionLimits of
Excavation Not to Scale
Theoretical Slope Break
3.2m
Existing Ground Surface
3.2m
1.0 Vertical
Limits of Excavation
0.5 Horizontal
4.8 m
1.0 Vertical
1.0 Horizontal
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Route Georgia Slope CorrectionReinforcement
Not to Scale
Theoretical Slope Break
3.2m
0.15m
0.30m
Existing Ground Surface
3.2m
1.0 Vertical
0.5 Horizontal
0.05m
4.8 m
NOTES Geotextile Fabric Amoco 6086 (US
Equivalent 2044) Spacing is 0.30m, 11 total
Layers Backfill Material, 30-60mm Aggregate, cap
w/ 0-30 Seams have min overlap of 0.2m and
perpendicular to face of slope
1.0 Vertical
1.0 Horizontal
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Route Georgia Slope CorrectionFace Formwork
Welded Wire FabricWWF, Not To Scale
0.42 m
0.30 m
45 degrees
1.70 m
1.0 Vertical
Notes Face formwork consists of welded wire
fabric, 6m long by 2.15m wide, folded along the
long axis at a 45 degree angle.
1.0 Horizontal
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Route Georgia Slope CorrectionGeotextile Facing
DetailNot To Scale
1.0m overlap
0.42 m
0.30 m
4.8m to 3.2m, depending on elevation
1.0 Vertical
Notes Place geotextile and drape at least 1.5m
extra Over WWF formwork. Place aggregate up
against Fabric/formwork. Once aggregate is
placed, drape Geotextile back over for at least
1.0m overlap
1.0 Horizontal
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Route Georgia Slope CorrectionScope of Work

• Remove Existing Guard rail and save
• Paint on ground limits of excavation
• Excavate out failed material and beyond
• Place geotextile in 0.3m layers between 30-60mm
  Aggregate

• Cap slope with 0-30mm Aggregate
• Replace Guard rail
• Excavate drainage ditch above slope to divert
  future runoff

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Route Georgia Slope CorrectionSpecifications

• Material shall be removed as shown on limits of
  excavation
• The Geotextile shall be placed, pulled tight and
  formed against the welded wire fabric
• No equipment shall be on the geotextile

• Aggregate shall be back dumped onto the fabric
• The aggregate shall be compacted with the D4
  dozer
• All dimensions and slope angles must be
  maintained within 10

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Construction Planning
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ConstructionSlope Excavation
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ConstructionSlope Excavation
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ConstructionPlacing Geotextile WWF
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ConstructionPlacing Geotextile WWF
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ConstructionCompaction Equipment
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Finished ProductSlope Face
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Finished ProductRoad
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Project Facts

• Materials Cost, 8,000
• 220 cubic meters of Aggregate
• 4700 square meters of Geotextile
• 2600 Man-Hours
• 13 Days
• Teamwork Success

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Lessons Learned

• Keep it simple
• Communicate
• Show evidence of Prior Success
• Rehearse prior to construction