Assessment of identifiable defect size in a drilled shaft using sonic echo method

Numerical simulation

Yan Hong Huang, Sheng-Huoo Ni, Kuo Feng Lo, Jenq Jy Charng

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The purpose of this paper is to study the capabilities of the sonic echo method in assessing the location of defects and the minimum possible detectable defect size in a drilled shaft. Three-dimensional axisymmetric finite element models were performed to investigate the effects of the defect size, defect depth-to-shaft diameter ratio, and shaft-to-soil stiffness ratio on the response of the sonic echo test. According to the results from the numerical simulations, a useful formula for defect size assessment in a shaft based on the sonic echo method is proposed, considering these factors simultaneously. Furthermore, a formula for predicting the detectable length-to-diameter ratio of a shaft was also recommended which correlates with the shaft-to-soil stiffness ratio and it varies from 10 to 32.

Original languageEnglish
Pages (from-to)757-768
Number of pages12
JournalComputers and Geotechnics
Volume37
Issue number6
DOIs
Publication statusPublished - 2010 Sep 1

Fingerprint

shaft
numerical method
defect
Defects
Computer simulation
simulation
Stiffness
stiffness
Soils
soil
method

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Computer Science Applications

Cite this

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abstract = "The purpose of this paper is to study the capabilities of the sonic echo method in assessing the location of defects and the minimum possible detectable defect size in a drilled shaft. Three-dimensional axisymmetric finite element models were performed to investigate the effects of the defect size, defect depth-to-shaft diameter ratio, and shaft-to-soil stiffness ratio on the response of the sonic echo test. According to the results from the numerical simulations, a useful formula for defect size assessment in a shaft based on the sonic echo method is proposed, considering these factors simultaneously. Furthermore, a formula for predicting the detectable length-to-diameter ratio of a shaft was also recommended which correlates with the shaft-to-soil stiffness ratio and it varies from 10 to 32.",
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Assessment of identifiable defect size in a drilled shaft using sonic echo method : Numerical simulation. / Huang, Yan Hong; Ni, Sheng-Huoo; Lo, Kuo Feng; Charng, Jenq Jy.

In: Computers and Geotechnics, Vol. 37, No. 6, 01.09.2010, p. 757-768.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Assessment of identifiable defect size in a drilled shaft using sonic echo method

T2 - Numerical simulation

AU - Huang, Yan Hong

AU - Ni, Sheng-Huoo

AU - Lo, Kuo Feng

AU - Charng, Jenq Jy

PY - 2010/9/1

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AB - The purpose of this paper is to study the capabilities of the sonic echo method in assessing the location of defects and the minimum possible detectable defect size in a drilled shaft. Three-dimensional axisymmetric finite element models were performed to investigate the effects of the defect size, defect depth-to-shaft diameter ratio, and shaft-to-soil stiffness ratio on the response of the sonic echo test. According to the results from the numerical simulations, a useful formula for defect size assessment in a shaft based on the sonic echo method is proposed, considering these factors simultaneously. Furthermore, a formula for predicting the detectable length-to-diameter ratio of a shaft was also recommended which correlates with the shaft-to-soil stiffness ratio and it varies from 10 to 32.

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