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Volume 32 Issue 2
Feb.  2025
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文章导航 >  矿物冶金与材料学报（英文）  > 2025  >  32(2): 311-324
Qian Yin, Fan Wen, Zhigang Tao, Hai Pu, Tianci Deng, Yaoyao Meng, Qingbin Meng, Hongwen Jing, Bo Meng, and Jiangyu Wu, Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression, Int. J. Miner. Metall. Mater., 32(2025), No. 2, pp. 311-324. https://doi.org/10.1007/s12613-024-3014-5
Cite this article as:
Qian Yin, Fan Wen, Zhigang Tao, Hai Pu, Tianci Deng, Yaoyao Meng, Qingbin Meng, Hongwen Jing, Bo Meng, and Jiangyu Wu, Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression, Int. J. Miner. Metall. Mater., 32(2025), No. 2, pp. 311-324. https://doi.org/10.1007/s12613-024-3014-5
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研究论文

真三轴压缩条件下骨料粒径分布和碳纳米管对矸石胶结充填体力学性能的影响

  • 1)

    中国矿业大学深部地下工程智能建设与健康运维国家重点实验室, 徐州 221116, 中国

  • 2)

    安徽理工大学深部煤矿开采响应与灾害防治国家重点实验室, 淮南 232001, 中国

  • 3)

    中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室, 北京 100083, 中国

  • 4)

    新疆工程学院新疆煤炭资源绿色开采教育部重点实验室, 乌鲁木齐 830023, 中国



  • 通讯作者:

    文凡    E-mail: w15135313372@163.com

    吴疆宇    E-mail: wujiangyu@cumt.edu.cn

文章亮点

  • (1) 系统分析了矸石胶结充填体在真三轴压缩下的力学性能和能量耗散特征。
  • (2) 研究了碳纳米管和骨料粒径分布对材料力学响应的微观影响机理。
  • (3) 研究了矸石胶结充填体在真三轴压缩环境下的裂纹扩展模式和破坏模式。
  • 矸石胶结充填材料的力学性能与骨料级配、胶结材料性能密切相关。在此基础上，对骨料粒径分布满足分形理论的不同CNT浓度的矸石胶结充填体（CGBSs）进行了真三轴压缩、SEM及EDS试验。研究了CGBSs在真三轴压缩作用下的变形特性、能耗特征和破坏机理。试验结果表明，添加适量的碳纳米管可有效提升CGBSs的力学性能和能量耗散，其最佳效果出现在CNT浓度为0.08wt%时。以PSD分形维数（D）为2.500为例，相比于PCNT为 0的CGBS，PCNT 为0.08wt%的CGBS的峰值强度（$ {\sigma _{\text{p}}} $）、轴向峰值应变（$ {\varepsilon _{{\text{1p}}}} $）、弹性能（$ {U_{\text{e}}} $）和耗散能（$ {U_{\text{d}}} $）分别提高了12.76%、29.60%、19.05%和90.39%。然而，过量的CNTs会因团聚而降低CGBSs的力学性能，表现为当PCNT从0.08wt%增加到0.12wt%时，$ {\sigma _{\text{p}}} $、$ {\varepsilon _{{\text{1p}}}} $和体积应变增量（$ \Delta {\varepsilon _{\text{v}}} $）降低明显。此外，CNTs的加入提高了CGBSs宏观破坏后的完整性，并且CGBSs的裂纹扩展出现了两种模式：沿骨料偏转绕行和穿过骨料。CGBSs的$ {\sigma _{\text{p}}} $和$ {U_{\text{d}}} $随着骨料粒径分布分形维数D的增加先增大后减小，孔隙度呈相反的趋势。峰值应变和弹性能均与分形维数呈负相关，当D = 2.150时，CGBSs的粗骨料摩擦滑移现象明显，其变形参数最大（$ {\varepsilon _{{\text{1p}}}} $ = 0.05079, $ \Delta {\varepsilon _{\text{v}}} $ = 0.01990）。随着细骨料含量的增加，CGBSs的破坏模式由斜向剪切破坏过渡为“Y”形剪切破坏进而转化为“X”形剪切破坏。
    • Research Article

    Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression

    + Author Affiliations
      Abstract
    • The mechanical behavior of cemented gangue backfill materials (CGBMs) is closely related to particle size distribution (PSD) of aggregates and properties of cementitious materials. Consequently, the true triaxial compression tests, CT scanning, SEM, and EDS tests were conducted on cemented gangue backfill samples (CGBSs) with various carbon nanotube concentrations (PCNT) that satisfied fractal theory for the PSD of aggregates. The mechanical properties, energy dissipations, and failure mechanisms of the CGBSs under true triaxial compression were systematically analyzed. The results indicate that appropriate carbon nanotubes (CNTs) effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging, and the optimal effect appears at PCNT of 0.08wt%. Taking PSD fractal dimension (D) of 2.500 as an example, compared to that of CGBS without CNT, the peak strength ($ {\sigma _{\text{p}}} $), axial peak strain ($ \varepsilon_{\text{1,p}} $), elastic strain energy ($ {U_{\text{e}}} $), and dissipated energy ($ {U_{\text{d}}} $) increased by 12.76%, 29.60%, 19.05%, and 90.39%, respectively. However, excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration, manifesting a decrease in $ {\sigma _{\text{p}}} $, $ \varepsilon_{\text{1,p}} $, and the volumetric strain increment ($ \Delta {\varepsilon _{\text{v}}} $) when PCNT increases from 0.08wt% to 0.12wt%. Moreover, the addition of CNTs improved the integrity of CGBS after macroscopic failure, and crack extension in CGBSs appeared in two modes: detour and pass through the aggregates. The $ {\sigma _{\text{p}}} $ and $ {U_{\text{d}}} $ firstly increase and then decrease with increasing D, and porosity shows the opposite trend. The $ \varepsilon_{\text{1,p}} $ and $ \Delta {\varepsilon _{\text{v}}} $ are negatively correlated with D, and CGBS with D = 2.150 has the maximum deformation parameters ($ \varepsilon_{\text{1,p}} $ = 0.05079, $ \Delta {\varepsilon _{\text{v}}} $ = 0.01990) due to the frictional slip effect caused by coarse aggregates. With increasing D, the failure modes of CGBSs are sequentially manifested as oblique shear failure, “Y-shaped” shear failure, and conjugate shear failure.
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