Vibration monitoring of tunnel faces applying 78GHz DBF-based high-speed imaging radar

H. Iwaki; T. Nishi; H. Tada

doi:10.1117/12.3013997

7 June 2024 Vibration monitoring of tunnel faces applying 78GHz DBF-based high-speed imaging radar

H. Iwaki, T. Nishi, H. Tada

Proceedings Volume 13048, Radar Sensor Technology XXVIII; 130480H (2024) https://doi.org/10.1117/12.3013997
Event: SPIE Defense + Commercial Sensing, 2024, National Harbor, Maryland, United States

Abstract

To prevent accidents caused by collapse and rockfall tunnel faces during construction, we considered vibration monitoring using a millimeter-wave (78-GHz band) DBF-based high-speed imaging radar. Basic performance tests were conducted in a radio anechoic room and test facility simulating an actual tunnel. It was confirmed that the accuracy of the 0.1-mm displacement-measurement, high-speed sampling of 0.001 s, and individual movements of several targets could be distinguished. Based on the basic test results, on-site measurements were performed at an actual tunnel construction site. The displacement and vibration changes of a tunnel face at the time of breakthrough can be captured; in addition, large velocity changes occur in a working face before breakthrough, and it might be possible to detect an abnormal tunnel face in advance. In addition, it was confirmed that the movement of the rockfall location was almost precisely captured even for small-scale flaking during the drilling of the working face, regardless of the condition in which a part of the measurement range became shadowed.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

H. Iwaki, T. Nishi, and H. Tada "Vibration monitoring of tunnel faces applying 78GHz DBF-based high-speed imaging radar", Proc. SPIE 13048, Radar Sensor Technology XXVIII, 130480H (7 June 2024); https://doi.org/10.1117/12.3013997

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available