A Procedure for Inspection of transmission Tower Foundations based on a Double-speed Method

The low-strain method is widely used in the integrity test of new pile foundation. However, for the foundation structure of a transmission tower, the traditional low-strain method cannot accurately evaluate the integrity of the pile foundation. This paper uses the double-speed method to resolve the up-traveling wave by an iterative method. According to the characteristics of the up-traveling wave, the integrity of the pile foundation of the transmission tower can be judged. A series of model tests are carried out to verify the accuracy of the proposed method.