Study on advancement of diagnostic support technology for tunnel lining concrete by performing raster scan measurement using laser hammering system

• Published in: Journal of Structural Engineering, A Vol. 68A; pp. 671 - 684
• Main Authors: Tomoto, Satoshi, Hasegawa, Noboru, Mikiami, Katsuhiro, Okada, Hajime, Nishikino, Masaharu, Kondo, Syuji, Kitamura, Toshiyuki, Nakamura, Hikaru
• Format: Journal Article
• Language: Japanese
• Published: Japan Society of Civil Engineers 2022; 公益社団法人 土木学会
• Subjects: raster scan measurement; small concrete spalling; spalling resistance; はく離抵抗性; ラスター（格子状）スキャン; 小規模コンクリートはく離
• ISSN: 1881-820X
• DOI: 10.11532/structcivil.68A.671

This study focused on the small concrete spalling caused by internal defects of time dependent behavior and investigated the relationship between spalling resistance and vibration properties using laser hammering system. By referring the laboratory test data, it was succeeded to detect for small spalling by using the raster scan measurement. In addition, the specimen’s vibration property data was simulated by the modelling of internal defect’s spalling resistance with spring constant. Finally, based on the verification of the issues and advancement of diagnostic by comparing human diagnostics method applying the existing tunnel lining, an effective way of implementing the laser hammering system was suggested.