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Temperature effect on shear behavior of ore-backfill coupling specimens at various shear directions

不同剪切方向作用下矿石-充填体耦合试样剪切行为的温度效应

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Abstract

Understanding the temperature effect on shear behavior of the ore-backfill coupling structure is critical for the safety and stability of backfill stope under the condition of high horizontal stress in deep mining. Direct shear tests were carried out on the cemented rod-mill sand backfill (CRB) and ore-CRB (OCRB) coupling specimens at various temperatures (20, 40 and 60 °C). The shear behavior and AE characteristic parameters of OCRB at different shear directions were compared and analyzed. The results show that the temperature effect on the shear performance of CRB mainly depends on the characteristics of microstructures and main mineral phases; the performance of CRB at 40 °C is relatively good; the shear deformation of OCRB has one more “peak fluctuation stage” than CRB and has a good correlation with AE characteristic parameters. The temperature can positively or negatively impact the shear strength of OCRB, depending on the temperature and shear direction; the shear performance of OCRB along the axis direction (D1) is significantly better than that perpendicular to the axis direction (D2). The co-bearing capacity of the ore-backfill coupling structure (i.e., stopes) is closely related to the ambient temperature and principal stress orientation.

摘要

为了理解深部高水平应力条件下温度对矿石-充填体耦合结构体剪切特性的影响效应, 分别对不同温度(20, 40, 60 °C)下棒磨砂胶结充填体(CRB)和矿石-充填体耦合试样(OCRB)开展直剪试验, 并对不同剪切方向作用下OCRB 的剪切行为及AE 特征参数进行比较分析. 结果表明: 温度对CRB 剪切性能的影响主要取决于其微观结构和主要矿物相特性, 且在40 °C 时的性能相对较优; OCRB 的剪切变形较CRB 增加了“峰值波动阶段”, 且与AE 特征参数有良好的相关性, 温度对OCRB 的剪切强度既可以是正面影响也可以是负面影响, 这取决于温度值大小和剪切作用方向; 沿轴向(D1)方向OCRB 的剪切性能明显优于垂直于轴向(D2)方向的, 矿石-充填体耦合结构(即采场)的共同承载性能与环境温度和主应力方向密切相关.

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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

    Fei-fei Jiang  (江飞飞) & Hui Zhou  (周辉)

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Fei-fei Jiang  (江飞飞) & Hui Zhou  (周辉)

  3. National Engineering Research Center for Metal Mining, Changsha Institute of Mining Research Co., Ltd., Changsha, 410012, China

    Jia Sheng  (盛佳) & Xiang-dong Li  (李向东)

  4. School of Resource & amp; Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

    Jia Sheng  (盛佳)

  5. Jinchuan Group Co., Ltd., Jinchang, 737104, China

    Yong-yuan Kou  (寇永渊)

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  1. Fei-fei Jiang  (江飞飞)
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Correspondence to Fei-fei Jiang  (江飞飞).

Additional information

Foundation item

Project(KFJ-STS-QYZD-174) supported by the Science and Technology Service Network Initiative of the Chinese Academy of Sciences; Projects(41941018, 42077251) supported by the National Natural Science Foundation of China; Project(P2018G045) supported by the Science & amp; Technology Research and Development Program of China Railway; Project(2018CFA013) supported by the Hubei Provincial Natural Science Foundation Innovation Group, China

Contributors

The overarching research goals were developed by JIANG Fei-fei and ZHOU Hui. JIANG Fei-fei, SHENG Jia, and KOU Yong-yuan conducted the laboratory tests and analyzed the experimental results. JIANG Fei-fei, ZHOU Hui, and LI Xiang-dong conducted the literature review and wrote the first draft of the manuscript. All the authors replied to reviewers’ comments and revised the final version.

Conflict of interest

JIANG Fei-fei, ZHOU Hui, SHENG Jia, LI Xiang-dong, and KOU Yong-yuan declare that they have no conflict of interest.

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Jiang, Ff., Zhou, H., Sheng, J. et al. Temperature effect on shear behavior of ore-backfill coupling specimens at various shear directions. J. Cent. South Univ. 28, 3173–3189 (2021). https://doi.org/10.1007/s11771-021-4841-4

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