Reliability Evaluation of Cross-Hole Sonic Logging for Bored Pile Integrity
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 131, Issue 9
Abstract
Defects present in a pile may not be encountered during a cross-hole sonic logging (CSL) test. Even when defects are indeed encountered, they may not always be detected. This paper proposes a probabilistic analysis procedure for evaluating the reliability of CSL, thereby providing a theoretical supplement to existing experimental evaluations of CSL. The reliability of this integrity testing method is represented by the inspection probability, which is expressed as the product of the encountered probability and the detection probability. Mathematical models to calculate the encountered probability are formulated and a detection probability model is suggested based on existing CSL test data. Several examples are presented to illustrate the proposed procedure. The results indicate that there exists a minimum detectable defect size below which the defect cannot be inspected. For a given number of access tubes, the minimum detectable defect size, as a percentage of the pile cross-sectional area, decreases with the pile diameter. The encountered probability can be taken as an index to determine the required number of access tubes. When the target encountered probability is specified as 0.95, three and four access tubes will be sufficient to encounter defects larger than 15 and 5% of the pile cross-sectional area, respectively.
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Acknowledgment
This research was substantially supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region (Project No. HKUST6035/02E).
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 131 • Issue 9 • September 2005
Pages: 1130 - 1138
Copyright
© 2005 ASCE.
History
Received: Sep 28, 2004
Accepted: Jan 10, 2005
Published online: Sep 1, 2005
Published in print: Sep 2005
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