Shear responses of dense granular mixtures of spherical coarse particles with the rolling resistance and spherical fine particles are studied via triaxial compression tests using the discrete element method. The macroscale responses (shear strength and dilatancy) are examined. Comparing the results with those in the literature indicates that granular mixtures with a rolling resistance coefficient of 0.5 have similar macroscale responses to those of gravel-shaped coarse particle mixtures. We quantify the microscale responses including the percentage contributions of contact types, partial coordination number, average particle rotation, average degree of interlocking, and local structural properties. A detailed analysis of the force–fabric anisotropy reveals the mechanisms of the variations in the shear strength with the rolling resistance coefficient and the fines content. The mechanism of the variation in the shear strength with the fines content for granular mixtures with a rolling resistance coefficient of 0.5 is different from that for gravel-shaped coarse particle mixtures. Finally, we find that a rolling resistance linear model weakens the linear relationship between the stress ratio and the fabric anisotropy of strong and non-sliding contacts when the fines content is 30% and 40%.

使用离散元方法通过三轴压缩试验研究了具有滚动阻力的球形粗颗粒和球形细颗粒的致密颗粒混合物的剪切响应。检查宏观响应（剪切强度和剪胀性）。将结果与文献中的结果进行比较表明，滚动阻力系数为0.5的粒状混合物具有与砾石状粗颗粒混合物相似的宏观响应。我们量化了微观响应，包括接触类型，部分配位数，平均颗粒旋转，平均互锁度和局部结构性质的百分比贡献。对力-织物各向异性的详细分析揭示了剪切强度随滚动阻力系数和细粉含量变化的机理。滚动阻力系数为0.5的粒状混合物的剪切强度随细粉含量变化的机理与砾石状粗颗粒混合物的剪切强度不同。最后，我们发现当细粉含量为30％和40％时，滚动阻力线性模型削弱了应力比与强滑动接触和非接触接触的织物各向异性之间的线性关系。