宽级配粗粒土数值试验微观参数的敏感性分析

来源 :中国水利水电科学研究院第十二届青年学术交流会 | 被引量 : 0次 | 上传用户:z7228279
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在离散元数值试验中,微观参数的取值直接决定着宏观参数.目前微观参数的研究多针对窄级配土、小尺寸的试样,基于宽级配粗粒土微观参数的研究较少.本文采用离散单元法,根据某水利工程宽级配粗粒料试验级配,采用常规大型三轴压缩试样尺寸,分析了线性接触模型中颗粒接触刚度和摩擦系数等微观参数对初始弹性模量、初始体积模量以及峰值强度的影响规律.研究发现:初始弹性模量和初始体积模量均随着刚度比的增大而减少,当刚度比较大时,峰值强度表现为明显的下降趋势;颗粒摩擦系数的大小对峰值强度的影响显著,当摩擦系数小于0.8时,对初始弹性模量和初始体积模量的影响较大.建议了针对大尺寸试样、宽级配数值试验的刚度比取值范围为1.0~5.0,摩擦系数取值为0.4~0.8.
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