Frequency of Observed Anomalies in Drilled Piles Integrity Tested by Thermal Methods
Publication: IFCEE 2024
ABSTRACT
The structural integrity of concrete cast in place drilled foundations is often determined by cross hole sonic logging, low strain impact-echo, gamma-gamma logging, or thermal integrity methods. Studies have characterized the frequency of observed significant anomalies detected by the first three methods. This study reviews a large database of drilled foundations tested by thermal methods over the last seven years. The frequency and general location in the shaft of major anomalies, as characterized by a 6% effective radius reduction criteria, are summarized and reviewed. Based on these criteria, anomalies occur in approximately 15% of the 2104 shafts reported. Of those 318 drilled foundations with anomalies, 77 (28%) identified anomalies occur within a length equivalent to the bottom two diameters of the foundation element, a rate similar to that reported by studies using other integrity methods.
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IFCEE 2024
Pages: 86 - 93
History
Published online: May 3, 2024
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