PIPELINE BRIDGE
CROSSING FOR MINING
TRUCKS
Bernard Shen
2015 Small Bridges Conference
Melbourne
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Overview
• Project introduction
• Design criteria
• The design
• Loads
• Analysis
• Construction
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Project Introduction
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ABOVE GRADE PIPELINES
CROSSING LOCATIONS
BURIED PIPELINES
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Options
• Option 1 Relocate pipelines (buried)
– Uneconomical $$$
• Option 2 Above grade crossing (bridge)
– Selected option
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The Challenge
• Asset owner requirements
• To provide 2 m x 5 m access envelope
around the pipes for minor works
• Crossing able to be dismantled within 24
hours for emergency access
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Plant
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• CAT 785
250t fully loaded
mining truck
(Frequent)
• CAT 5230
300t mining
excavator
(Occasional)
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Ideas
• Off the shelf or prefabricated culverts
• Beams over 1m3 mass concrete blocks
• Formed walls and slab (selected option)
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Concept
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Design
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WATER MAINS
FILL
RESIDUAL SOIL
BEDROCK
MINING TRUCK
CAT 785C (250 TONNE)
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Load Distribution
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Load Consideration
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LINE LOAD
UDL
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Load On Structure
• Vertical load – Simplistic methods
probably sufficient
• Lateral load (earth pressure) – 6 methods
were considered
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Lateral Earth Pressure
• 6 methods considered
Method 1 – Line load
Method 2 – Rankine active earth pressure theory
Method 3 – Surcharge
Method 4 – Semi-infinite load with elastic theory
Method 5 – Loaded strip with elastic theory
Method 6 – Finite element method
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Lateral Earth Pressure
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Method 1
Method 4
Method 5
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Lateral Earth Pressure
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• What to design for?
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Adopted In Design
• Method 3 for structural design
• Method 6 to check stability
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Passive Earth Pressure
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Analysis (Stability)
• Hand calculation (overturning) – FOS>2
• 2D Finite element – Loaded to “failure”
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Analysis (Deformation)
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6 mm
17 mm
“POOR” BACKFILL CASE
UNDER SERVICE LOAD
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Structural Design
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Construction
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Construction
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Construction
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Construction
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Construction
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Construction
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Construction
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In Operation
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• Donaldson Coal
• Hunter Water Corporation
Acknowledgements
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Thank You
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Thank You