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| The best supporting time of hydraulic tunnels based on multiple monitoring information |
| XIAO Peiwei1,2, YANG Xingguo1,2, QIAN Hongjian3, WANG Haofan4, LI Biao4*, XU Nuwen1,2
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1. College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, Sichuan, China;
2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, Sichuan, China;
3. CHN Energy Jinsha River Xulong Hydropower Co., Ltd., Garze Tibetan Autonomous Prefecture 627950, Sichuan, China;
4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan, China |
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Abstract To scientifically determine the timing of hydraulic tunnel support under complex geological conditions in the southwestern region, the diversion tunnel of Xulong Hydropower Station was selected as the research object. Three-dimensional laser scanning, acoustic wave testing, and microseismic monitoring technologies were integrated into a collaborative analysis method for surface deformation, shallow damage, and internal fractures. Through continuous spatiotemporal monitoring, the time-dependent deformation characteristics of surrounding rock, evolution patterns of wave velocity fields, and spatiotemporal distribution modes of microfractures were systematically tracked. Monitoring data revealed that significant deformation of surrounding rock, wave velocity variations, and microseismic activities were observed during the initial stage. These parameters gradually stabilized 11 days after excavation. During this period, the self-bearing capacity of the surrounding rock was maximized, serving as the basis for optimal support timing. Engineering practice verified that the self-supporting capacity of Class II surrounding rock was fully utilized when supports were implemented 11 days post-excavation. This finding provides important references for determining support timing in similar projects.
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Published: 28 March 2025
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