岩の工学的性質

[III-314] Evaluation of elastic wave velocity of rocks using Laser impact and Laser doppler vibrometer

*鈴木 健一郎¹、奥澤 康一¹、新村 亮¹、島田 義則²、倉橋 慎理²、オレグ コチャエフ² (1. 大林組　、2. レーザー総合技術研究所)

Keywords:rock, elastic wave velocity, laser impact, laser doppler vibrometer

Remote inspection is made possible in laser technology. In this study, elastic wave velocities of rocks were measured using laser impact and laser doppler vibrometer(LDV). The measured results showed the followings:

-Elastic wave velocities of rocks measured using laser were correlated with that measured using piezo sensor. The coefficient of correlation was 1.25.

-The waves that pass through the side surface of specimens had same velocity of the wave that through centers of specimens.

-In case without reflection tape, transmitted wave velocity was influenced by surface waves and underestimated.