19th WORLD CONFERENCE OF THE ASSOCIATED RESEARCH CENTRES FOR THE URBAN UNDERGROUND SPACE, Belgrade, Serbia, November 4-7, 2025. (Paper No: 8.1.9, pp. 971-972)
АУТОР(И) / AUTHOR(S): Yifeng Li, Zhikai Wei, Joseph Hong, Xuefeng Li
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DOI: 10.46793/ACUUS2025.8.1.9
САЖЕТАК / ABSTRACT:
To provide new land supply, the Hong Kong Government issued the Long-term Strategy for Cavern Development, creating space inside mountains for utilizations. To conduct full process rock mass monitoring during the construction and operation stages of super large cavern projects, fiber optic detection was piloted in a certain cavern project in Hong Kong for the first time. The project team designed and installed 17 optical fibers with 2660 sensors around one of the main caverns with a cross-sectional area of nearly 900 square meters. After completion, real-time and continuous rock condition monitoring can be carried out. The installed fibers have a maximum depth of 67 meters, while the on-site conditions are limited with no similar project for reference. To achieve the required monitoring effect without affecting normal construction conditions, optimized design and a series of auxiliary construction methods were implemented. At present, the installed fibers are well protected, operating normally, the data transmission is timely and stable, and provide real-time monitoring and early warning. The fiber optic monitoring method summarized in this article has strong innovation, which has not been studied and applied in the past. practical project verifies that can meet the existing monitoring needs, and has good application in the whole process of cavern development monitoring. Methods summarized in this paper can provide design and construction references for future projects.
КЉУЧНЕ РЕЧИ / KEYWORDS:
Fiber optic monitoring; Cavern construction; wFBG fiber; Rock mass monitoring; Drill-in fiber design
ПРОЈЕКАТ / ACKNOWLEDGEMENT:
This paper is sponsored by the Technology Research and Development Project of China State Construction International Holdings Limited (CSCI-2023-Z-17).
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