Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

The foundation of the terminal in the Second Bangkok International Airport consists of over 25,000 bored piles (drilled shafts) and prestressed concrete cylinder driven piles installed in a complex stratified subsurface formation of soft and stiff clays interbedded by silty sands. A train tunnel to be located underneath the main terminal is a cut-and-cover tunnel supported on its sides by 1-meter thick reinforced concrete diaphragm walls and at the bottom a 2-meter thick basal slab. Particular technical challenges existed in the long-term settlement and potential downdrag caused by changes in effective overburden stresses as a result of excessive pumping of the deeper aquifers in Bangkok area. Long term performance of the terminal buildings would be threatened by potential differential settlements around heavily loaded Trellis roof pylons. To address these problems, innovative analytical procedures were developed and applied using advanced theories and numerical methods involving pile load transfer mechanisms, numerical integration of closed-form solutions to the Mindlin’s Problems, Finite Element Analyses, as well as a field pile load test program including load-transfer measurements and bi-directional loading to validate the design. The pile load test program has been completed and demonstrated the validity of design parameters and assumptions. All of the 25,437 piles were installed in 12 months, 50% of the time available, and with progress peaking at about 4,000 piles a month. The paper will describe a project overview, geology and subsurface conditions, design of foundation systems and the diaphragm wall, load tests, foundation construction, settlement measurements and evaluations, and will be concluded by discussing valuable experiences obtained as well as lessons learned.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Deep Foundations for New International Airport Passenger Terminal Complex in Bangkok

New York, New York

The foundation of the terminal in the Second Bangkok International Airport consists of over 25,000 bored piles (drilled shafts) and prestressed concrete cylinder driven piles installed in a complex stratified subsurface formation of soft and stiff clays interbedded by silty sands. A train tunnel to be located underneath the main terminal is a cut-and-cover tunnel supported on its sides by 1-meter thick reinforced concrete diaphragm walls and at the bottom a 2-meter thick basal slab. Particular technical challenges existed in the long-term settlement and potential downdrag caused by changes in effective overburden stresses as a result of excessive pumping of the deeper aquifers in Bangkok area. Long term performance of the terminal buildings would be threatened by potential differential settlements around heavily loaded Trellis roof pylons. To address these problems, innovative analytical procedures were developed and applied using advanced theories and numerical methods involving pile load transfer mechanisms, numerical integration of closed-form solutions to the Mindlin’s Problems, Finite Element Analyses, as well as a field pile load test program including load-transfer measurements and bi-directional loading to validate the design. The pile load test program has been completed and demonstrated the validity of design parameters and assumptions. All of the 25,437 piles were installed in 12 months, 50% of the time available, and with progress peaking at about 4,000 piles a month. The paper will describe a project overview, geology and subsurface conditions, design of foundation systems and the diaphragm wall, load tests, foundation construction, settlement measurements and evaluations, and will be concluded by discussing valuable experiences obtained as well as lessons learned.