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A Microseismic Method for Dynamic Warning of Rockburst Development Processes in Tunnels

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Abstract

Early warning of rockbursts remains a worldwide challenge in rock engineering. In this work, a microseismicity-based method of rockburst warning in tunnels is proposed to warn of and reduce the risk of rockburst. The method uses real-time microseismic data and an established rockburst warning formula to provide dynamic warning of rockburst risk during excavation of a tunnel. The establishment of the rockburst warning formula involves several key parts. These include a rockburst database, selection of typical rockburst cases, functional relationships between microseismicity and rockbursts, optimal weighting coefficients, and dynamic updating. By using the proposed method, the probability of strain and strain-structure slip rockbursts of different intensity (extremely intense, intense, moderate, slight, and none) can be warned of in real time. The method has been successfully applied to rockburst warning in deeply buried tunnels at the Jinping II hydropower project (about 11.6 km in total for D & B tunnels). This success illustrates the applicability of the proposed method. In addition, it is found that during the rockburst development process, the microseismic eigenvalues for strainbursts are bigger than in strain-structure slip rockbursts of the same intensity.

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Acknowledgments

The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (grant no. 11232014). The authors would also like to thank Professors Zhou Hui, Wu Shiyong, Wang Jimin, and Zeng Xionghui, and Dr. Zhao Zhouneng, Chen Dongfang and Mr Li Qingpeng who give support and assistance during microseismicity monitoring in the headrace and drainage tunnels in the Jinping II hydropower station project.

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Authors and Affiliations

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    Guang-Liang Feng, Xia-Ting Feng, Bing-rui Chen & Ya-Xun Xiao

  2. Key Laboratory of Ministry of Education for Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, 110004, China

    Yang Yu

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  1. Guang-Liang Feng
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  2. Xia-Ting Feng
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  3. Bing-rui Chen
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  4. Ya-Xun Xiao
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  5. Yang Yu
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Correspondence to Xia-Ting Feng.

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Feng, GL., Feng, XT., Chen, Br. et al. A Microseismic Method for Dynamic Warning of Rockburst Development Processes in Tunnels. Rock Mech Rock Eng 48, 2061–2076 (2015). https://doi.org/10.1007/s00603-014-0689-3

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  • DOI: https://doi.org/10.1007/s00603-014-0689-3

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