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Excavation-induced microseismicity and rockburst occurrence: Similarities and differences between deep parallel tunnels with alternating soft-hard strata

开挖诱发的微震活动与岩爆: 深埋软硬交互地层平行隧洞的异同

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Abstract

Excavation-induced microseismicity and rockburst occurrence in deep underground projects provide invaluable information that can be used to warn rockburst occurrence, facilitate rockburst mitigation procedures, and analyze the mechanisms responsible for their occurrence. Based on the deep parallel tunnels with the maximum depth of 1890 m created as part of the Neelum-Jhelum hydropower project in Pakistan, similarities and differences on excavation-induced microseismicity and rockburst occurrence between parallel tunnels with soft and hard alternant strata are studied. Results show that a large number of microseismic (MS) events occurred in each of the parallel tunnels during excavation. Rockbursts occurred most frequently in certain local sections of the two tunnels. Significant differences are found in the excavation-induced microseismicity (spatial distribution and number of MS events, distribution of MS energy, and pattern of microseismicity variation) and rockbursts characteristics (the number and the spatial distribution) between the parallel tunnels. Attempting to predict the microseismicity and rockburst intensities likely to be encountered in subsequent tunnel based on the activity encountered when the parallel tunnel was previously excavated will not be an easy or accurate procedure in deep tunnel projects involving complex lithological conditions.

摘要

深部地下工程开挖诱发的微震活动和岩爆实录可为岩爆预警、 岩爆防控策略制定及岩爆发生机理分析提供非常宝贵的信息. 本文依托巴基斯坦尼勒姆-杰勒姆水电站深埋平行隧洞(最大埋深 1890 m), 聚焦开挖诱发的微震活动和岩爆信息, 对软硬交互地层平行隧洞之间的异同进行了研究. 结果表明, 开挖过程中, 平行隧洞均产生了大量微震事件, 岩爆频发于隧洞局部洞段. 同时, 平行隧洞由开挖诱发的微震活动性(微震事件的空间分布和数量、 微震能量分布和微震活动性变化规律)和岩爆特征(频次和空间分布)均存在显著差异. 针对复杂岩性条件的深埋平行隧洞, 仅根据先行隧洞开挖诱发的微震活动和岩爆信息, 难以有效预测后续平行隧洞对应区域开挖过程中将发生的微震活动和岩爆强度.

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Acknowledgments

The authors appreciate the help and assistance from the Beijing Vibroflotation Engineering Co., Ltd., Neelum-Jhelum Consultant, China Gezhouba Group Co., Ltd., and Beifang Investigation, Design & Research Co., Ltd. The authors would like to thank Prof. FENG Xia-ting, CEng Gary Peach, and Mr. TAN Shuang for their kindly help during the research.

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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  (丰光亮), Bing-rui Chen  (陈炳瑞), Quan Jiang  (江权) & Ya-xun Xiao  (肖亚勋)

  2. Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning, 530000, China

    Guang-liang Feng  (丰光亮)

  3. Key Laboratory of Ministry of Education of Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, 110819, China

    Wen-jing Niu  (牛文静) & Peng-xiang Li  (李鹏翔)

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  1. Guang-liang Feng  (丰光亮)
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  2. Bing-rui Chen  (陈炳瑞)
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  3. Quan Jiang  (江权)
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  6. Peng-xiang Li  (李鹏翔)
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Contributions

FENG Guang-liang carried out the onsite experiment, organized the study and wrote the content. CHEN Bing-rui designed and took part in the onsite experiment. JIANG Quan and NIU Wen-jing modified the content. XIAO Ya-xun and LI Peng-xiang took part in the onsite experiment study. All authors have read and approved the final manuscript.

Corresponding author

Correspondence to Guang-liang Feng  (丰光亮).

Ethics declarations

FENG Guang-liang, CHEN Bing-rui, JIANG Quan, XIAO Ya-xun, NIU Wen-jing, and LI Peng-xiang declared that they have no conflicts of interest to this work.

Additional information

Foundation item: Projects(41972295, U1965205) supported by the National Natural Science Foundation of China; Project(2019ZDK034) supported by the Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, China

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Feng, Gl., Chen, Br., Jiang, Q. et al. Excavation-induced microseismicity and rockburst occurrence: Similarities and differences between deep parallel tunnels with alternating soft-hard strata. J. Cent. South Univ. 28, 582–594 (2021). https://doi.org/10.1007/s11771-021-4623-z

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  • DOI: https://doi.org/10.1007/s11771-021-4623-z

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