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