接触摩擦对颗粒材料宏细观力学特征和能量演变规律的影响

doi:10.13722/j.cnki.jrme.2021.0264

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摘要颗粒材料的接触摩擦与颗粒表面的粗糙度和颗粒形状有密切的关系，颗粒表面的粗糙不平阻碍颗粒间的相对滑动，颗粒形状不规则阻碍颗粒间的滚动。采用考虑抗滚动效应的接触模型，进行不同滑动摩擦因数和滚动摩擦因数组合下的常规三轴试验的离散元数值模拟，研究不同滑动摩擦和滚动特性联合作用下颗粒材料的宏细观力学特性和能量演化规律。结果表明：对于形状相似(相同)的颗粒材料，随着颗粒表面粗糙程度的增大，试样的剪胀性增大，对应的峰值强度增大，但残余强度变化不大。而对宏观应力–应变的影响规律在不同情况下具有明显的差异性：对于颗粒表面比较光滑的材料，颗粒形状不规则性的增加对峰值强度和残余强度的影响较小；对于粗糙程度比较大的颗粒材料，颗粒形状不规则性的增加可以显著提高试样的峰值强度和残余强度。从细观角度，统计分析剪切过程中颗粒表面粗糙度及颗粒形状对试样内部颗粒滑动、滚动接触占比的影响及细观能量的变化规律。

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	王怡舒1
	刘斯宏1
	沈超敏1
	陈静涛2

关键词 ：土力学, 滑动摩擦, 滚动摩擦, 宏观应力&ndash, 应变, 接触类型, 能量耗散

Abstract：The friction characteristics of geotechnical granular materials are closely related to the roughness of the particle surface and the particle shape. The roughness surface will hinder the relative sliding between particles while the irregular particle shape will hinder the rolling between particles. The conventional triaxial tests with different values of the sliding friction coefficientand the rolling friction coefficientwere carried out to study the influence of the inter-particle contact friction on the macro and micro mechanical properties and energy evolution of granular materials by using linear-based rolling resistance model in discrete element method(DEM). The results show that for the materials with similar particle shape(the same)，the dilatancy and the peak strength increase with increasing the particle roughness，while the residual strength changes little. For the granular materials with smooth surfaces，the irregularity of the particle shape has little effect on the peak and residual strengths. For the coarse granular materials，however，the irregularity of the particle shape can obviously improve the peak and residual strengths. From the microscopic perspective，the influence of the surface roughness and the particle shape on the proportions of sliding and rolling contacts，as well as the evolution of the micro energy，were analyzed during shearing.

Key words： soil mechanics sliding friction rolling friction macro stress-strain contact types energy dissipation

引用本文:

王怡舒1，刘斯宏1，沈超敏1，陈静涛2. 接触摩擦对颗粒材料宏细观力学特征和能量演变规律的影响[J]. 岩石力学与工程学报, 2022, 41(2): 412-422.
WANG Yishu1，LIU Sihong1，SHEN Chaomin1，CHEN Jingtao2. Influence of contact friction on macro-micro mechanical behavior and energy evolution of granular materials. , 2022, 41(2): 412-422.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0264 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I2/412

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