International Journal of the JSRM
Online ISSN : 2189-8405
Development of EDZ Evaluation Technique for Underground Cavern Excavation by Distributed Fiber Optic Sensing Method
Koji HATA Sumio NIUNOYAHirokazu FUJII
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JOURNAL OPEN ACCESS

2025 Volume 21 Issue 1 Article ID: 250102

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Abstract
Excavation damaged zones are created when excavating underground caverns and generate AE at micro-amplitude. This research is a challenge to apply DAS with C-OTDR technology to AE measurement. The results of laboratory and in-situ experiments showed that differences in optical fiber specifications did not have a significant effect on AE measurements. In addition, it was found that source location can be identified in the same way as with conventional in-situ AE measurements. Furthermore, the monitoring range of conventional AE sensors is generally 5 m to 10 m, but the new method can extend the monitoring range to 35 m.
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© 2025 Japanese Society of Rock Mechanics

This article is licensed under a Creative Commons [Attribution-NonCommercial-NoDerivatives 4.0 International] license.
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