recent trends in pile foundations auger cast piles for low noise / low vibration
TRANSCRIPT
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Recent Trends in Pile Foundations Auger Cast Piles for
Low Noise / Low Vibration
Presenter: Nick Briffa, PE Group Delta Consultants
Presented to: ASCE Orange County Geo-Institute
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Driven Piles
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Auger Cast – Continuous Flight Auger (CFA)
• Continuous Hollow Screw Auger
• Genrates spoils • Designed like CIDH • No displacement • Not common in Calif
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Need for Auger Cast Piles
• Soft Clay Site • High Groundwater • Surcharge improvement not always possible • Sound restrictions for driven piles • Environmental restrictions for drilled piles • Contaminated Groundwater/soil (no cuttings)
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Auger Displacement Pile (ADP)
• Solid lead with Displacement Tip
• Generates little spoils • Designed like Driven
Pile • Displacement • Most common in Calif • Morris-Shea, Condon-
Johnson, Malcolm, Berkel
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Auger Cast Pile Overview
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Goal of Previous Test Programs by Group Delta
• Test Program for Agency Acceptance • Replacement for Driven 14” Concrete Piles • 180-200 Kip Design Loads • 70-100 Kip Liquefaction Down-drag loads • 500-600 Kip Ultimate Capacity • Over 50 Load Tests to date
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Project Location Largest Urban In-fill in US
$6 Billion development
Former Hughes Aircraft / Runway Facility
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Playa Vista Geotechnical
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AUGER CAST PRESSURE GROUTED (closed system, continuous grout pressure)
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QC - Installation Record
• Improvement from standard record
• Real-Time plots of torque, grout pressure and grout take with depth (not time)
• Field Verification of embedment depth into target layer
• Torque in absolute Kip-ft
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DeWaal Pile
• Open System • Concrete
Gravity • Conc Feed
Pressure by tremmie head
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QA/QC - Installation Record
• “Open System” – top open to gravity
• DeWaal Pile, Fundex Inspector’s IPad Screen
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Torque as a Target Indicator
• Absolute torque analogous to driving energy
• Dense Sand/Gravel indicated by 60 Ft-Kips
• Good correlation with CPT Qc
• Useful for Installation / End Bearing Verification
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Torque vs. Qc
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Typical Compression Test Result
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Typical Tension Test Result
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Load Test – Creep Plot • Modified ASTM Procedure • Held at Design load until less than 0.005 inch/hr. (ASTM is 0.01 inch/hr)
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Long Term Test – 62 days • Tested at Ultimate Load – 602 Kips.
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Pile Exhumation Initial Jack-out Pile Lifting after relief holes drilled
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Exhumed Pile Examination
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Exhumed Pile Details Pile “Belly” – Soft Clay Response
Pile “Wart”
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Exhumed Pile Details Pile “Swirl” – Sensitive Clay Response
Pile “Neck” – low grout at interval
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Pile Tip – In Dense Gravel from 50 feet deep
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Composite of Exhumed Pile
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Pile Coring
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ADP Conclusions • Local Agency Acceptance (DSA, City) • Torque good indicator of bearing (60 ft-kips) –
independent of auger type • Electronic Monitoring improved QC and installation
verification – better than Gamma or HighStrain • Monitored Grout increment should be no more than
2 feet • Long Term Testing at ultimate load – long term creep • Pile Exhumation verified monitoring and NDT
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Alternate Application
Auger Cast Tangent Pile Walls
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Current Pile Installs and Testing Morris Shea DeWaal Piles
• 8,000 Piles since 2013 • 50-70 Feet Long • 500-600 Kip Ult. Capacity • 200 Kip Allowable Capacity • Another 2000 for 2 projects
starts Nov 2015
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Accepted Specs for Buildings
Open Systems (DeWall, Fundex)
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Accepted Specs for Buildings Closed Grout Systems (APGD, Alpha)