土留め(1)

[III-166] A practical application of non-destructive testing method using vibration for evaluating residual tensile force of ground anchors

〇Hideki Saito¹, Mitsuru Yamazaki², Atsushi Yashima³, Kazuki Nawa³, Satoshi Tazumi³, Yoshinobu Murata³, Keizo Kariya³, Kunio Aoike¹, Yoshinori Sone¹ (1.Oyo, 2.Central Nippon Highway Engineering Nagoya, 3.Gifu University)

Keywords:ground anchor, residual tensile force, resonant frequency, sweep, spectrogram

A non-destructive testing method was proposed in which vibration is input from the extra length of anchor in order to excite the natural resonance frequency of the free length part. As the results of mock-up experiments using three types of ground anchors, we found that the resonant frequency of free part can be observed by setting a small size vibrator and accelerometer only at the extra part of the anchor. We would like to call the method "non-lift test" and to establish as a practical test method.