Abstract
Focusing on the problems caused by rockburst hazards in deep tunnels, such as casualties, damage to construction equipment and facilities, construction schedule delays, and project cost increase, this research attempts to present a methodology for dynamic risk assessment and management of rockbursts in D&B tunnels. The basic idea of dynamic risk assessment and management of rockbursts is determined, and methods associated with each step in the rockburst risk assessment and management process are given, respectively. Among them, the main parts include a microseismic method for early warning the occurrence probability of rockburst risk, an estimation method that aims to assess potential consequences of rockburst risk, an evaluation method that utilizes a new quantitative index considering both occurrence probability and consequences for determining the level of rockburst risk, and the dynamic updating. Specifically, this research briefly describes the referenced microseismic method of warning rockburst, but focuses on the analysis of consequences and associated risk assessment and management of rockburst. Using the proposed method of risk assessment and management of rockburst, the occurrence probability, potential consequences, and the level of rockburst risk can be obtained in real-time during tunnel excavation, which contributes to the dynamic optimisation of risk mitigation measures and their application. The applicability of the proposed method has been verified by those cases from the Jinping II deep headrace and water drainage tunnels at depths of 1900–2525 m (with a length of 11.6 km in total for D&B tunnels).
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Acknowledgments
The authors sincerely thank the financial support from the National Natural Science Foundation of China (no. 41320104005). The authors would also express their sincere thanks to Professor Wu Shiyong and Dr. Xiao Yaxun, Zhao Zhouneng, and Mr. Li Qingpeng who gave support and assistance during microseismicity monitoring in the headrace and drainage tunnels in the II hydropower station project.
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Liu, GF., Feng, XT., Feng, GL. et al. A Method for Dynamic Risk Assessment and Management of Rockbursts in Drill and Blast Tunnels. Rock Mech Rock Eng 49, 3257–3279 (2016). https://doi.org/10.1007/s00603-016-0949-5
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DOI: https://doi.org/10.1007/s00603-016-0949-5