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In-site core disking phenomenon and break mechanism of hard marble: Investigation in 2400 m deep-buried underground laboratory

大理岩岩芯饼化现象与破坏机理: 2400 m 深埋地下实验室现场试验研究

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Abstract

The core-disk phenomenon has been observed generally in the drilling process under high-stress conditions. This paper presents the in-situ experimental study of the coring-disking failure mechanism of marble in an underground cavens with 2400 m depth. Based on the disk samples in several boreholes with different diameters, both macro- and micro-morphological characteristics of core-disks’ break surface were analysis, using 3D optical scanning and electron microscope scanning. Moreover, the numerical back analysis was also used to simulate the drilling process for demonstrating the development of core disking. The in-situ experiment results showed that the failure types of core disking consisted of tensile break and shear break, i.e., the shear break usually appears in the edge part of break surface, and tensile break appears in the central part. What’s more, the ration of core-disks thickness to borehole diameter is in a relatively stable range. Numerical back analysis indicated this micro asynchronous break of hard marble is induced by high geostress and unloading drill.

摘要

高应力条件下钻孔过程中, 岩芯饼化体现了深部岩体一种典型的破裂模式. 本文依托埋设达 2400m 的中国锦屏深部地下实验室, 通过现场试验揭示了锦屏大理岩饼化的原位规律和破裂机制. 首先基于现场不同孔径钻孔的饼化岩芯, 通过宏观饼厚统计、细观 3D 激光扫描和微观电镜观察, 揭示了饼化岩芯破坏面的多尺度宏细观形貌特征; 进而通过数值方法模拟钻进过程中岩芯的局部应力应变演化特征和饼化动态发展过程. 分析揭示岩芯饼化破裂同时包含了张拉破裂和剪切破裂,剪切破裂多出现于岩饼的边缘部位而张拉破裂多出现于岩饼的中心部位; 而且不同直径钻孔岩饼统计表明饼化岩芯厚度与直径的比值基本不变. 综合研究表明外部高应力环境和钻进过程中岩芯自身局部卸荷与应力 集中是导致大理岩微观上异步饼化破裂的关键驱动因素.

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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

    Shan Zhong  (钟山), Quan Jiang  (江权), Chang Liu  (刘畅), Shao-jun Li  (李邵军) & Wei-min Qin  (覃卫民)

  2. College of Engineering, Swansea University, Swansea, SA18EP, UK

    Shan Zhong  (钟山)

  3. University of Chinese Acadamy of Science, Beijing, 100049, China

    Chang Liu  (刘畅)

  4. Yalong River Hydropower Development Company, Ltd., Chengdu, 610051, China

    Ji-fang Zhou  (周济芳) & Wen-liang Sun  (孙文良)

Authors
  1. Shan Zhong  (钟山)
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  3. Chang Liu  (刘畅)
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  4. Shao-jun Li  (李邵军)
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  5. Wei-min Qin  (覃卫民)
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  6. Ji-fang Zhou  (周济芳)
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  7. Wen-liang Sun  (孙文良)
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Contributions

ZHONG Shan carried out the onsite experiment and wrote the content. JIANG Quan designed and organized the study and modified the content. LIU Chang, LI Shao-jun and QIN Wei-min took part in the experiment study. ZHOU Ji-fang and SUN Wen-liang provided the experimental site and equipment. All authors have read and approved the final manuscript.

Corresponding author

Correspondence to Quan Jiang  (江权).

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Conflict of interest

ZHONG Shan, JIANG Quan, LIU Chang, LI Shao-jun, QIN Wei-min, ZHOU Ji-fang, and SUN Wen-liang declared that they have no conflicts of interest to this work.

Foundation item: Projects(U1965205, 51779251, 41672314) supported by the National Natural Science Foundation of China

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Zhong, S., Jiang, Q., Liu, C. et al. In-site core disking phenomenon and break mechanism of hard marble: Investigation in 2400 m deep-buried underground laboratory. J. Cent. South Univ. Technol. 27, 2959–2970 (2020). https://doi.org/10.1007/s11771-020-4521-9

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  • DOI: https://doi.org/10.1007/s11771-020-4521-9

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