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Effects of temperature and age on physico-mechanical properties of cemented gravel sand backfills

温度和龄期对砾石砂胶结充填体物理力学性能的影响

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Abstract

Cemented backfill used in deep mines would inevitably be exposed to the ambient temperature of 20–60 °C in the next few decades. In this paper, two types of cemented gravel sand backfills, cemented rod-mill sand backfill (CRB) and cemented gobi sand backfill (CGB), were prepared and cured at various temperatures (20, 40, 60 °C) and ages (3, 7, 28 d), and the effects of temperature and age on the physico-mechanical properties of CRB and CGB were investigated based on laboratory tests. Results show that: 1) the effects of temperature and age on the physico-mechanical properties of backfills mainly depend on the amount of hydration products and the refinement of cementation structures. The temperature has a more significant effect on thermal expansibility and ultrasonic performance at early ages. 2) The facilitating effect of temperature and age on the compressive strength of CGB is higher than that on CRB. With the increase of temperature, the compressive failure modes changed from X-conjugate shear failure to tensile failure, and the integrity of specimens was significantly improved. 3) Similarly, the shear performance of CGB is generally better than that of CRB. The temperature has a weaker effect on shear strength than age, but the shear deformation and shear plane morphology are closely related to temperature.

摘要

深部矿山胶结充填体在未来数十年里将不可避免地会暴露在 20∼60 °C 的环境温度中. 本文制备了两种砾石砂胶结充填体, 即棒磨砂胶结充填体(CRB)和戈壁砂胶结充填体(CGB), 并分别在不同温度(20 °C、40 °C、60 °C)和龄期(3 d、7 d、28 d)条件下进行了养护;然后, 基于室内试验探索了温度和龄期对 CRB 和 CGB 物理力学特性的影响效应. 结果表明: 1) 温度和龄期对充填体物理力学特性的影响主要取决于水化产物量和胶结结构密实度, 温度对早期充填体热膨胀性和超声性能的影响更为显著; 2) 温度和龄期对 CGB 抗压强度的促进作用要强于 CRB, 随着温度的升高, 试样的压缩破坏形式由 X-共轭剪切破坏转变为拉伸破坏, 试样的完整性得到了显著改善; 3) 同样 CGB 的抗剪性能普遍优于CRB, 温度对充填体抗剪强度的影响较龄期要弱, 但剪切变形和剪切面破坏形态与温度密切相关.

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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 & 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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  2. Hui Zhou  (周辉)
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  3. Jia Sheng  (盛佳)
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  5. Xiang-dong Li  (李向东)
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Contributions

The overarching research goals were developed by ZHOU Hui and JIANG Fei-fei. 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 authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Hui Zhou  (周辉).

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Conflict of interest

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

Foundation item: Project(P2018G045) supported by the Science & Technology Research and Development Program of China Railway; Project(2018CFA013) supported by the Hubei Provincial Natural Science Foundation Innovation Group, China; Project(KFJ-STS-QYZD-174) supported by the Science and Technology Service Network Initiative of the Chinese Academy of Sciences; Project(51709257) supported by the National Natural Science Foundation of China

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Jiang, Ff., Zhou, H., Sheng, J. et al. Effects of temperature and age on physico-mechanical properties of cemented gravel sand backfills. J. Cent. South Univ. Technol. 27, 2999–3012 (2020). https://doi.org/10.1007/s11771-020-4524-6

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  • DOI: https://doi.org/10.1007/s11771-020-4524-6

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