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Defect Detection and Examination of Large Drilled Shafts Using a New Cross-Hole Sonic Logging System
Drilled shafts and other mixed or cast-in-place concrete deep foundation elements can be costly solutions. These foundations usually carry very high design loads, and often serve as a non-redundant, single load-carrying unit. These conditions have created a need for a high-level of quality assurence and control applied to each in-place constructed deep foundation element. The non-destructive testing method, Cross-Hole Sonic Logging (CSL), currently offers the most reliable technique for assessing the integrity of in-place constructed deep foundation elements. Recent years have seen progress in CSL instrumentation, taking advantage of the available computer technology. The software applications, however, have greatly fallen behind, thereby limiting the effectiveness and potential of the CSL method and deep foundations integrity testing in general. A new, original CSL testing system by the name of PISA (Pile Integrity Sonic Analyzer) makes use of an innovative software and data acquisition system, hence representing the state-of-the-art in deep foundation integrity testing. The PISA has the capability to show real-time graphical information during logging, including planar tomography, which can identify the boundaries of a compromised zone within the foundation element. The equipment operates completely in a WindowsTM graphical environment allowing alphanumeric and graphical reports to be generated directly into word processing software. The real-time graphical representation during logging and the ease of reporting enables immediate, extensive on-site evaluation and decision making. The PISA system was evaluated on several different construction sites. The obtained results from one particular site are presented, demonstrating the ease of use, accuracy of measurements and enhanced capabilities. The systems' abilities are shown to be superior to any other currently available commercial system.
Defect Detection and Examination of Large Drilled Shafts Using a New Cross-Hole Sonic Logging System
Drilled shafts and other mixed or cast-in-place concrete deep foundation elements can be costly solutions. These foundations usually carry very high design loads, and often serve as a non-redundant, single load-carrying unit. These conditions have created a need for a high-level of quality assurence and control applied to each in-place constructed deep foundation element. The non-destructive testing method, Cross-Hole Sonic Logging (CSL), currently offers the most reliable technique for assessing the integrity of in-place constructed deep foundation elements. Recent years have seen progress in CSL instrumentation, taking advantage of the available computer technology. The software applications, however, have greatly fallen behind, thereby limiting the effectiveness and potential of the CSL method and deep foundations integrity testing in general. A new, original CSL testing system by the name of PISA (Pile Integrity Sonic Analyzer) makes use of an innovative software and data acquisition system, hence representing the state-of-the-art in deep foundation integrity testing. The PISA has the capability to show real-time graphical information during logging, including planar tomography, which can identify the boundaries of a compromised zone within the foundation element. The equipment operates completely in a WindowsTM graphical environment allowing alphanumeric and graphical reports to be generated directly into word processing software. The real-time graphical representation during logging and the ease of reporting enables immediate, extensive on-site evaluation and decision making. The PISA system was evaluated on several different construction sites. The obtained results from one particular site are presented, demonstrating the ease of use, accuracy of measurements and enhanced capabilities. The systems' abilities are shown to be superior to any other currently available commercial system.
Defect Detection and Examination of Large Drilled Shafts Using a New Cross-Hole Sonic Logging System
Chernauskas, Les R. (author) / Paikowsky, Samuel G. (author)
Specialty Conference on Performance Confirmation of Constructed Geotechnical Facilities ; 2000 ; Amherst, Massachusetts, United States
2000-04-03
Conference paper
Electronic Resource
English
Defect Detection and Examination of Large Drilled Shafts Using a New Cross-Hole Sonic Logging System
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