李东升, 刘东升, 贺文俊, 胡江雷. 2016: 风化煤矸石抗剪强度粒径影响试验研究. 工程地质学报, 24(3): 376-383. DOI: 10.13544/j.cnki.jeg.2016.03.006
    引用本文: 李东升, 刘东升, 贺文俊, 胡江雷. 2016: 风化煤矸石抗剪强度粒径影响试验研究. 工程地质学报, 24(3): 376-383. DOI: 10.13544/j.cnki.jeg.2016.03.006
    LI Dongsheng, LIU Dongsheng, HE Wenjun, HU Jianglei. 2016: EXPERIMENTAL STUDY ON THE EFFECT OF PARTICLE SIZE TO SHEAR STRENGTH OF WEATHERING GANGUE. JOURNAL OF ENGINEERING GEOLOGY, 24(3): 376-383. DOI: 10.13544/j.cnki.jeg.2016.03.006
    Citation: LI Dongsheng, LIU Dongsheng, HE Wenjun, HU Jianglei. 2016: EXPERIMENTAL STUDY ON THE EFFECT OF PARTICLE SIZE TO SHEAR STRENGTH OF WEATHERING GANGUE. JOURNAL OF ENGINEERING GEOLOGY, 24(3): 376-383. DOI: 10.13544/j.cnki.jeg.2016.03.006

    风化煤矸石抗剪强度粒径影响试验研究

    EXPERIMENTAL STUDY ON THE EFFECT OF PARTICLE SIZE TO SHEAR STRENGTH OF WEATHERING GANGUE

    • 摘要: 煤矸石在排弃后粒径分布沿垂直剖面会呈现出明显的规律性,以现场煤矸石筛分级配为基础,进行了3试验级配下不同试样含水率时的风化煤矸石室内直剪试验。试验结果表明:低试样含水率时,风化煤矸石试验剪应力-剪位移曲线存在相对突出的峰值,呈明显应变软化现象;但随试样含水率的增加,风化煤矸石应力-应变关系呈现出明显的应变硬化特征。级配在不同含水条件下对风化矸石抗剪强度参数的影响存在差异,低试样含水率时粗颗粒形成的骨架对风化矸石内摩擦角有着重要影响,但随含水率增大,矸石细颗粒状态则对其起到控制性作用。各试验级配风化煤矸石内黏聚力随含水率增加差异减少试验值趋于一致,但内摩擦角的下降速率则明显存在区别,至饱和时风化煤矸石内摩擦角值下降至近零值,此时风化煤矸石试样抗剪强度主要由内黏聚力提供。

       

      Abstract: The distribution of coal gangue particle size along the vertical profile shows obvious regularity after been abandoned. Based on field gradation, the indoor direct shear tests of three grading weathering gangues in different moisture content were completed, the test results indicate that the stress-strain relationship of weathering gangue samples is from the strain softening to the strain hardening gradually with the increase of moisture content. The effect of gradation to shear strength of weathering gangue is difference in different moisture content, the backbone formed by coarse particles has an prominent influence to the internal friction angle of weathering gangue in low sample moisture content, but with the increase of moisture content, the effect of fine particle state is even more prominent. Along with the increase of moisture content, the cohesive force values among three grading coal gangues are close to accordance, but the declining rate of internal friction angle is obvious different, when the moisture content reaches saturation, the values of internal friction angle has dropped to near zero, at this time the shear strength of weathering gangue is mainly composition by its internal cohesive force.

       

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