LARGE SCALE TESTING TO PROTECT SAN FRANSCISO WATER SUPPLY
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LARGE SCALE TESTING TO PROTECT SAN FRANSCISO WATER SUPPLY Tom O’Rourke Thomas R. Briggs Professor PowerPoint PPT Presentation


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LARGE SCALE TESTING TO PROTECT SAN FRANSCISO WATER SUPPLY Tom O’Rourke Thomas R. Briggs Professor of Engineering Cornell University. SAN FRANCISO PUBLIC UTILITIES COMMISSION WATER SYSTEM IMPROVEMENT PLAN. 86 Projects $4.6 Billion New Calaveras Dam Retrofit 2 Water Treatment Plants

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LARGE SCALE TESTING TO PROTECT SAN FRANSCISO WATER SUPPLY Tom O’Rourke Thomas R. Briggs Professor

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Large scale testing to protect san fransciso water supply tom o rourke thomas r briggs professor

LARGE SCALE TESTING TO PROTECT SAN FRANSCISO WATER SUPPLY

Tom O’Rourke

Thomas R. Briggs Professor

of Engineering

Cornell University


San franciso public utilities commission water system improvement plan

SAN FRANCISO PUBLIC UTILITIES COMMISSION WATER SYSTEM IMPROVEMENT PLAN

  • 86 Projects

  • $4.6 Billion

  • New Calaveras Dam

  • Retrofit 2 Water Treatment Plants

  • 450 km Pipelines

  • 3 Tunnels


Bdpls 3 4 at hayward fault

BDPLs 3 & 4 at Hayward Fault

  • Owner/Operator: San Francisco Public Utilities Commission (SFPUC)

  • Designer: URS, Inc.

  • Test Facility: Cornell Large-Scale Lifelines Testing Facility, George E. Brown Jr. Network for Earthquake Engineering Simulation


Large scale testing to protect san fransciso water supply tom o rourke thomas r briggs professor

BAY DIVISION PIPELINES

BDPLs 3 & 4

70% Bay Area

Water

San Francisco Public Utilities Commission

BDPLs 1 & 2

BDPLs 3 & 4


Bdpls 3 4 at hayward fault1

BDPLs 3 & 4 at Hayward Fault

  • 2-m-diameter Pipeline Crossing Hayward Fault at ~47 Degrees

  • 2 m Lateral Fault Offset

  • Compressive Deformation and Lateral Offset of Pipeline from Fault Movement

  • 24-m-wide Right-of-way with Other Pipelines


Large scale testing to protect san fransciso water supply tom o rourke thomas r briggs professor

Protective Vault 91.5 m long

Segments: 6.1 x 6.1 x 6.1 m

Joints: 45 degrees


Large scale testing to protect san fransciso water supply tom o rourke thomas r briggs professor

Before Fault

Movement

Segments:

6.1m x 6.1m

x 6.1 m

After Fault

Movement

Joints:

150 & 300

mm


Construction of vault

CONSTRUCTION OF VAULT

  • Secant Walls for Cut-and Cover Support

  • Lower Strength Secondary Wall Elements

Secant Walls

Vault with Pipeline

Backfill


Purpose of tests

PURPOSE OF TESTS

  • Validate Design Approach

  • Assess Relative Movement of Segments

  • Understand Interaction Between Vault & Secant Pile Walls

  • Evaluate Joint Effects on Vault Performance

  • Assess Effects of EPS Fill Between Secant Wall and Vault


3 d view of test set up

3-D VIEW OF TEST SET UP


Cornell tests

CORNELL TESTS

  • 1/10 th Scale

  • Test Basin:

    • 13 m Long

    • 3.2 m Wide

    • 2.1 m Deep


Concrete test segments

CONCRETE TEST SEGMENTS

1 m = 3.28 ft

25. 4 mm = 1 in.


Scaling relationships

SCALING RELATIONSHIPS

Joint Rotation

Joint Stiffness


Instrumentation

INSTRUMENTATION

  • 6 Degrees of Freedom at Each Segment

  • Accurate to 0.25 mm

  • LVDT/DCDT, Temposonic Sensors, Lasers

  • ~ 120 Measurements per Displacement Episode

  • Tactile Force Sensors

  • High Resolution Video Cameras


Large scale testing to protect san fransciso water supply tom o rourke thomas r briggs professor

Tactile Force Pressure Sensors

50 X 40 cm plan dimensions


Factors affecting vault deformation

FACTORS AFFECTING VAULT DEFORMATION

  • Location of Vault Joint Relative to Fault

  • Joint Rotational Stiffness

  • Nature of Backfill Between Vault and Secant Pile Wall


Fault location vs vault joint

FAULT LOCATION VS VAULT JOINT

  • Fault Centered on Joint

    • Vault Deformation Closest to Fault

    • Greatest Joint Rotation

  • Fault Centered on Vault

    • Vault Deformation Farthest from Fault

    • Smallest Joint Rotation


Pretest block layout

Pretest Block Layout

50 deg

South 

S4

S3

S2

N3

N2

N1

C

S1

N4

 North

EPS particles with soil cover


1 m offset

1 m offset

50 deg

South 

 North


2 m offset

2 m offset

50 deg

South 

 North


3 m offset

3 m offset

50 deg

South 

 North


5 m offset

5 m offset

50 deg

South 

 North


Pretest block layout1

Pretest Block Layout

50 deg

South 

S4

S3

S2

N3

N2

N1

C

S1

N4

 North

EPS particles with soil cover


1 m offset1

1 m offset

50 deg

South 

 North


2 m offset1

2 m offset

50 deg

South 

 North


Lateral pressures

LATERAL PRESSURES

  • With Soil Backfill

    • 10-15% Max Passive Pressure at 2m of prototype fault offset


Lateral pressures1

LATERAL PRESSURES

  • With EPS

    • < 1% Max Passive Pressure at 2m of prototype fault offset


Heave at fault

HEAVE AT FAULT

  • Small to Moderate Heave Affected by Joint Stiffness

Flexible Joint

Stiff Joint


Rotation of joint at fault

ROTATION OF JOINT AT FAULT

Stiff Joint

Flexible Joint


Vault compression

VAULT COMPRESSION

  • Compressive Shortening 4-5 Segments from Fault

  • Joint Closure Contact 3-4 Segments from Fault

  • Joint Contact Never Observed at Ends of Vault


Nees testing for sfpuc

NEES TESTING FOR SFPUC

  • Continuous Design, Fabrication, and Testing over 9 Months to Support Actual

  • Successful Confirmation of Design Concept

  • Important Insights Regarding Behavior


Earthquake response and rehabilitation of critical lifelines

EARTHQUAKE RESPONSE AND REHABILITATION OF CRITICAL LIFELINES

Split Box

  • Substantial Industry Involvement

  • Insituform Technologies, Inc.

  • LADWP, SFPUC, EBMUD

  • Center for Advanced Microelectronics Mnfg.

Dual Shake Tables

Flexible Electronics


Collaboration with industry

COLLABORATION WITH INDUSTRY

  • Chevron Phillips

  • Consolidated Edison

  • Corning, Inc.

  • Exxon Mobil

  • Insituform Technologies

  • Gas Technology Institute

  • Los Angeles Department of Water and Power

  • Northeast Gas Assoc.

  • San Francisco Public Utility

  • Tekscan

  • Tokyo Gas, Ltd

  • ULC Robotics


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