Crosshole sonic techniques are ultrasonic methods used to evaluate the integrity of cast-in-place foundations such as drilled shafts, augered cast-in-place piles, and other drilled foundations. Ultrasonic transducers consisting of a transmitter and receiver are lowered down pre-installed access tubes tied to the reinforcing cage and raised at a constant speed to collect wave speed data. Standard Crosshole Sonic Logging (CSL) evaluates the concrete between pairs of access tubes. Single Hole Sonic Logging (SSL) is used when only one access tube is available and provides information near that tube. Crosshole Sonic Logging Tomography (CSLT) combines multiple measurements to create 2D and 3D images that better define the location and extent of anomalous zones. Together, these methods provide a useful set of tools for integrity evaluation, with the level of detail depending on the number of access tubes available and the project needs.
Crosshole Sonic Logging Tomography (CSLT)
Single Hole Sonic Logging (SSL)