邓文杰, 杨福荣, 胡海燕, 何立文, 黎成财. 2018: 颗粒级配对煤矸石强度变形特性的影响. 工程地质学报, 26(s1): 566-571. DOI: 10.13544/j.cnki.jeg.2018091
    引用本文: 邓文杰, 杨福荣, 胡海燕, 何立文, 黎成财. 2018: 颗粒级配对煤矸石强度变形特性的影响. 工程地质学报, 26(s1): 566-571. DOI: 10.13544/j.cnki.jeg.2018091
    DENG Wenjie, YANG Furong, HU Haiyan, HE Liwen, LI Chengcai. 2018: EFFECT OF GRAIN COMPOSITION ON STRENGTH AND DEFORMATION BEHAVIOR OF COAL GANGUE. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 566-571. DOI: 10.13544/j.cnki.jeg.2018091
    Citation: DENG Wenjie, YANG Furong, HU Haiyan, HE Liwen, LI Chengcai. 2018: EFFECT OF GRAIN COMPOSITION ON STRENGTH AND DEFORMATION BEHAVIOR OF COAL GANGUE. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 566-571. DOI: 10.13544/j.cnki.jeg.2018091

    颗粒级配对煤矸石强度变形特性的影响

    EFFECT OF GRAIN COMPOSITION ON STRENGTH AND DEFORMATION BEHAVIOR OF COAL GANGUE

    • 摘要: 从颗粒级配良好程度和粗粒含量两方面设置了4种颗粒级配,并利用三轴试验分析了不同颗粒级配条件下煤矸石的强度和变形特性。结果表明:不同级配的煤矸石,应力差均随围压和应变的增大而增大,并且应力-应变曲线无明显峰值,属应变硬化型;级配良好时,峰值强度与曲率系数Cc和不均匀系数Cu呈先减小后增加的抛物线分布,当级配由良好过渡到差时,峰值强度呈下降趋势;黏聚力随粗粒含量的减少而增加,其值主要由细颗粒决定,内摩擦角不仅受粗粒含量的影响还与颗粒的良好程度有关。

       

      Abstract: According to the well degree of grain composition and coarse grained content, four groups of grain composition were designed, and using triaxial tests, the strength and deformation characteristics of coal gangue with different grain composition were analyzed. The results reveal that, for coal gangue with different grain composition, the deviatoric stress is increasing with the increase of confining pressure and strain. The stress-strain curves have no peak and belong to strain hardening. When the grain composition is well, the distributions of peak strength with coefficient of curvature(Cc) and non-uniformity coefficient(Cu) are all parabolas, which are decreasing firstly then decreasing. While the grain composition becomes poor, the peak strength is decreasing gradually. The cohesive force is increasing with the decrease of coarse grained content, and its value is controlled by fine particles. The internal friction angle is not only affected by the content of coarse grain but also is associated with the well of grain composition.

       

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