Design and Construction of Auger-Cast Piles for the ...
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Design and Construction of Auger-Cast Piles for the Signature Bridge Reinaldo Villa, PE
Transcript of Design and Construction of Auger-Cast Piles for the ...
Design and Construction of Auger-Cast Piles for the Signature Bridge
Reinaldo Villa, PE
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1. Project Background
2. ACIP Pile Request
3. ACIP Pile Capabilities
4. Axial Pile Design
5. Lateral Creep
6. QC/QA of Production Piles
Presentation Outline
Installation of ACIP on I-395
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Project Background
Bridge 101
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Project BackgroundKey Team Members (Signature Bridge)
• Contractor: Archer Western – de Moya Group JV
• Design Management: Pevida Highway Designers
• Bridge EOR: HDR, Inc.
• Geotech EOR: Universal
• Piling Contractor: Keller North America
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Foundation Layout
Bridge 8 (Signature Bridge)
879 tons per pile
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Foundation Layout
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Geology
Tamiami Limestone Formation
Miami Limestone Formation
Intermediate Geo-Material (IGM)
Sand/Limestone Fragment Mixture
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1. Project Background
2. ACIP Pile Request
3. ACIP Pile Capabilities
4. Axial Pile Design
5. Lateral Creep
6. QC/QA of Production Piles
Presentation Outline
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ACIP Pile RequestACIP: Summary
• Augered Cast-in-Place (ACIP) foundations are a proven foundation system in South Florida
• Pressured grout providing a strong bond to cemented sand and weak limestone formations
• Neighboring the Signature Bridge a variety of public and private projects have been founded on ACIP
• Skin friction values as high as order of 20 ksf
• Seek FDOT approval for use
• MSP required for installationMarquis Miami founded on ACIP
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1. Project Background
2. ACIP Pile Request
3. ACIP Pile Capabilities
4. Axial Pile Design
5. Lateral Creep
6. QC/QA of Production Piles
Presentation Outline
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ACIP Pile Capabilities• 24” min. diameter (FDOT)
• 36” diameter usual max. (up to 46”)
• 180 ft. maximum depth
• Full-length reinforcement cage (no issue getting rebar in wet grout)
• Ability to install in low-head room conditions
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ACIP Pile CapabilitiesBattered Piles
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ACIP Pile CapabilitiesTight Space
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1. Project Background
2. ACIP Pile Request
3. ACIP Pile Capabilities
4. Axial Pile Design
5. Lateral Creep
6. QC/QA of Production Piles
Presentation Outline
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Axial Pile DesignGeotechnical Design Challenges
• High Compression loads (~1,900 tons nominal at center pier)(solution: bi-directional load testing and SPT/coring)
• Large Uplift loads (>500 tons)(solution: bi-directional load testing and SPT/coring)
• Differential Settlements bet. Center Piers and Arches(solution: SPT/coring, pressuremeter)
• Magnitude of lateral load due to arch shape(solution: pressuremeter testing and lateral load testing)
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Soil/Rock Design Parameters
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0 20 40 60 80 100 120De
sign
Skin
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SPT N-Value (bpf)
SPT N-Value vs. Design Skin Friction
𝑓𝑓𝑠𝑠 =12 𝑞𝑞𝑢𝑢𝑞𝑞𝑡𝑡 ∗ 𝑅𝑅𝑅𝑅𝑅𝑅 McVay method
Pressuremeter Test
Elastic modulus &Creep test
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Axial Pile Design- Final design based on 4 bi-directional load tests
(11 total for whole project)
- Rock cores used to derive rock side shear values
- Statistical analyses to develop correlations
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Axial Pile Design
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Axial Pile Design: Settlements
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1. Project Background
2. ACIP Pile Request
3. ACIP Pile Capabilities
4. Axial Pile Design
5. Lateral Creep
6. QC/QA of Production Piles
Presentation Outline
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Lateral Load Test ProgramGeotechnical objectives of the lateral load test program were to:
1. Confirm if soil/rock parameters used for lateral model in FB-MultiPiersoftware are appropriate
2. Perform 24-hour hold during the load test program to determine if additional softening of soil/rock parameters needs to be considered due to creep effects
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Lateral Load Test Program
TIP Wires
Strain Gauge
Challenge was to mobilize soil resistance at the cut-off elevation about 15 to 20 ft. below ground
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Lateral Load Test Program
30” Dia. Steel Pipe
36” Dia. ACIP Pile
Shape Array
Hydraulic Jack
Test Pile Installation (TP-9)
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1. Project Background
2. ACIP Pile Request
3. ACIP Pile Capabilities
4. Axial Pile Design
5. Lateral Creep
6. QC/QA of Production Piles
Presentation Outline
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QC/QA Production Piles
• Use of FDOT developmental 455 specifications for auger cast piles including bridges
• Use of automated monitoring equipment (AME)
• Experienced inspectors filling out FDOT logs independent of AME
• Use of Thermal Integrity Profiling on each pile
• Dynamic load test for proof load test
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QC/QA Production Piles• Proof load testing performed at each pier to
factored design load
• Good correlation between dynamic load test and equivalent head-down curves from bi-directional load tests
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QC/QA Production Piles
• Detection of anomalies
• Estimate of pile diameter vs depth
• Estimate of grout cover vs depth
Thermal Integrity Testing
Thank you!
