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Crosshole Sonic Logging vs 2D and 3D Crosshole Sonic Logging Tomography for Drilled Shafts

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N. Mekic-Stall, N. and Phil Sirles*, Denver, Colorado



Development of nondestructive testing methods (NDT) has greatly increased in recent years and one of the principal objectives of this development is reliable assessment of the overall integrity and/or the detection of defects within deep concrete foundations. In order to determine structural stability, other safety issues, and in particular, the project progress and success, obtaining accurate and timely information about construction defects is becoming increasingly important for deep foundations. Crosshole Sonic Logging (CSL) has become the standard practice for testing the integrity of drilled shafts. Although this method
has proven to be effective, the results are typically presented in one-dimensional format, are difficult to quantify, and thus may not be used by the project engineer. This paper will demonstrate that, at a minimum, CSL data can be processed and presented in two- and three-dimensional format for a shaft. We present the major differences between assessing shaft integrity using standard CSL and data presentation versus Crosshole Sonic Logging Tomography (CSLT) and 3D data visualization. This will be accomplished by implementing both forward modeling and analysis of field data from a test site.