On the design of instrumented double-wall model piles used to investigate plugging of open-ended pipe piles

Research output: Contribution to journalArticle

Abstract

Plugging of open-ended pipe piles during installation and loading is an important phenomenon with substantial effects on pile capacity. This paper offers a number of comments related to the design of instrumented double-wall pipe piles that are becoming increasingly popular in research.A double-wall pile consists of two concentric thin-wall cylinders that are rigidly fixed at the top and are free to strain independently of one another elsewhere, with the pile shoe attached to one of the cylinders. Instrumentation that permits defining the state of the stress around the pile is installed between the two cylinders. Pile geometry, location of pile shoe, protection of sensors, radial stress measurements, and pore water pressure measurements are discussed. Measurements indicate that when a pile plugs, load is transferred by arching to the inner pile surface within the first two pile diameters. The data also indicates that a surge in pore water pressure occurs with each hammer blow, which results in a reduction of effective stress and subsequent pile setup.

Original languageEnglish (US)
JournalGeotechnical Testing Journal
Volume34
Issue number2
DOIs
StatePublished - Mar 2011

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Piles
pile
pipe
Pipe
porewater
arching
stress measurement
Hammers
Stress measurement
Pressure measurement
effective stress
instrumentation
Water
sensor
geometry
Geometry
Sensors

Keywords

  • Axial stress
  • Calibration chamber
  • Instrument performance
  • Instrumentation
  • Load test
  • Load transfer
  • Plug
  • Pore water pressure
  • Radial stress
  • Slip-stick mechanism

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

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title = "On the design of instrumented double-wall model piles used to investigate plugging of open-ended pipe piles",
abstract = "Plugging of open-ended pipe piles during installation and loading is an important phenomenon with substantial effects on pile capacity. This paper offers a number of comments related to the design of instrumented double-wall pipe piles that are becoming increasingly popular in research.A double-wall pile consists of two concentric thin-wall cylinders that are rigidly fixed at the top and are free to strain independently of one another elsewhere, with the pile shoe attached to one of the cylinders. Instrumentation that permits defining the state of the stress around the pile is installed between the two cylinders. Pile geometry, location of pile shoe, protection of sensors, radial stress measurements, and pore water pressure measurements are discussed. Measurements indicate that when a pile plugs, load is transferred by arching to the inner pile surface within the first two pile diameters. The data also indicates that a surge in pore water pressure occurs with each hammer blow, which results in a reduction of effective stress and subsequent pile setup.",
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publisher = "American Society for Testing and Materials",
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AB - Plugging of open-ended pipe piles during installation and loading is an important phenomenon with substantial effects on pile capacity. This paper offers a number of comments related to the design of instrumented double-wall pipe piles that are becoming increasingly popular in research.A double-wall pile consists of two concentric thin-wall cylinders that are rigidly fixed at the top and are free to strain independently of one another elsewhere, with the pile shoe attached to one of the cylinders. Instrumentation that permits defining the state of the stress around the pile is installed between the two cylinders. Pile geometry, location of pile shoe, protection of sensors, radial stress measurements, and pore water pressure measurements are discussed. Measurements indicate that when a pile plugs, load is transferred by arching to the inner pile surface within the first two pile diameters. The data also indicates that a surge in pore water pressure occurs with each hammer blow, which results in a reduction of effective stress and subsequent pile setup.

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