Abstract
It is imperative to understand the spatial and temporal coordination deformation mechanism and develop targeted deformation control technologies for high sidewall — bottom transfixion (HSBT) zones to guarantee the stability of rock surrounding underground hydro-powerhouses under complex geological conditions. In this study, the spatial and temporal coordinated deformation control of HSBT zones was addressed from the aspects of the deformation mechanism, failure characteristics, and control requirements, and some coordinated deformation control technologies were proposed. On this basis, a case study was conducted on the deformation control of the HSBT zone of the underground powerhouse at the Wudongde hydropower station, China. The results showed that the relationship between excavation and support, and the mismatch of deformation and support of the surrounding rock mass in the HSBT zone of underground caverns with a large span and high in-situ stress can be appropriately handled. The solution requires proper excavation and construction procedures, fine blasting control, composite and timely support, and real-time monitoring and dynamic feedback. The technologies proposed in this study will ensure the safe, high-quality, and orderly construction of the Baihetan and Wudongde underground caverns, and can be applied to other similar projects.
概要
目的
揭示大型地下厂房高边墙及下部贯通区洞群变形协调控制机制,分析并预测全过程围岩变形力学行为,以有效控制大跨度、高地应力条件下大型地下厂房高边墙及下部贯通区洞群围岩变形协调,实现大型地下厂房安全优质有序的建设。
创新点
1. 揭示了多种因素联合作用下的地下厂房高边墙及下部贯通区洞群变形时空协调控制机理;2. 提出了大型地下厂房高边墙及下部贯通区洞群变形协调控制方法与技术。
方法
1. 通过理论分析、数值模拟及案例分析等方法,揭示地下厂房高边墙及下部贯通区洞群围岩变形联动特征及机理;2. 通过数值仿真、现场监测及案例分析,应用大型地下厂房高边墙及下部贯通区洞群变形协调控制方法与技术于乌东德大型地下厂房工程,验证所提方法的可行性和有效性。
结论
1. 岩体由高围压环境急剧转变为低围压和高应力差环境的力学机制以及工程开挖引致围岩扰动破坏的空间效应是形成大型地下洞室边墙显著时效变形的主要作用机制;2. 合理的开挖施工程序、精细爆破控制、复合与及时支护、实时监测和动态反馈等技术是控制复杂地质条件下大型地下洞室群施工开挖围岩稳定的有效手段。
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (Nos. 51979146 and 12102230), the China Three Gorges Corporation Research Program (Nos. WDD/0490, WDD/0578, and BHT/0774), and the China Postdoctoral Science Foundation (No. 2022M711862). The authors are very grateful to Prof. Yun-min CHEN and Dr. Duan-yang ZHUANG (Zhejiang University, China) for their critical suggestions on the research designing.
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Qi-xiang FAN designed the research and organized the manuscript. Zhi-yun DENG and Peng LIN processed the corresponding data and edited the manuscript. Guo LI, Ji-lin FU, and Wei HE revised and edited the final version.
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Qi-xiang FAN, Zhi-yun DENG, Peng LIN, Guo LI, Ji-lin FU, and Wei HE declare that they have no conflict of interest.
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Fan, Qx., Deng, Zy., Lin, P. et al. Coordinated deformation control technologies for the high sidewall—bottom transfixion zone of large underground hydro-powerhouses. J. Zhejiang Univ. Sci. A 23, 543–563 (2022). https://doi.org/10.1631/jzus.A2200060
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DOI: https://doi.org/10.1631/jzus.A2200060
Key words
- Underground powerhouse
- Coordinated deformation mechanism
- High sidewall—bottom transfixion (HSBT)
- Cavern group
- Control technology