Cepstrum Analysis Applied to Ultrasonic Reflection Wave Detection Wave Method to Investigate the Depth and the Damage of the Pile

摘要

In civil engineering, especially in construction sites, it is essential to investigate the degree of damage and the depth of foundation piles and pillars. Ultrasonic wave and elastic impact wave methods are currently used as typical non-destructive testing methods to be applied to a concrete object such as a foundation pile for construction. The latter is performed with using a hammer as its input making this method inaccurate and hard to obtain the same result each time. Therefore, ultrasonic measurement method was chosen over elastic impact wave method to be applied in this study. However, by using the conventional ultrasonic measurement method, since the input is very small, the depth of the investigation is very shallow. Therefore, if it becomes possible to input ultrasonic wave vibration into the concrete foundation pile, deeper depth investigation with higher precision will be attained. In this study, ultrasonic reflection wave detection method was used in order to measure the length of the pile and to detect the degree of damage in the pile.