ABSTRACT

A roughness measuring device with a sonar sensor was developed that can be used on the site where drilled shafts are used, and then a verification test was implemented. In the test, the levels of salinity, temperature, and turbidity were changed by reproducing the environment when there is water in a borehole. It was found that the sensors had an accuracy of 1 mm. Some of the measurement values of the slopes and curves were scattered due to the features of the waveforms of sonar sensors, but the specimens used in the test could be examined accurately. In addition, it was found that the values that the sonar sensors measured were not greatly affected by the change of the levels of salinity, temperature, and turbidity.

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