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工程力学  2012 

考虑端面摩擦效应的煤样统计损伤尺度本构模型

DOI: 10.6052/j.issn.1000-4750.2011.03.0163, PP. 344-349

Keywords: 尺度效应,本构关系,单轴压缩,煤样,端面摩擦

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Abstract:

煤与其它岩石类材料一样,在力学特性等方面具有尺度效应,基于Weibull理论和脆性材料强度的随机分布假设,采用损伤力学的方法建立了考虑端面摩擦效应的煤样单轴压缩尺度本构模型,并结合试验对模型进行了分析和验证。结果表明,煤样抗压强度随高宽比的增加明显减小,端面摩擦效应是导致Weibull理论与试验结果产生较大差异的主要原因,修正之后的本构关系与试验结果具有较好的相符性,其不仅能很好地反映煤样单轴压缩强度随尺寸的变化规律,而且能更好的描述单轴压缩的整个加载过程。

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