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Resonant column experiments with fine-grained model material - evidence of particle surface forces

机译：细粒模型材料的共振柱实验-颗粒表面力的证据

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Resonant column experiments were conducted with an extremely fine-grained material, viz. an α-aluminum oxide (Al_2O_3), which serves as a model material for cohesive soils with particle diameters in the range of μm. With this particle size interparticle forces from van der Waals and Coulombic interaction have an influence on the behavior of the material in dynamic shear tests. By adjusting the surface charge, and hence the Coulombic repulsion, we obtain repulsive or attractive particles, which influences sample fabric and shear stiffness. From the increase of shear stiffness at small strain (γ≤10~(-6)) with effective pressure we have estimated the net interparticle pressure from surface forces in the range of some kPa for a mean particle diameter of 0.8 μm. Our results show that the behavior of fine-grained granular materials at small shear strains cannot only be described by their density and stress state. Particle surface forces have to be taken into account.
机译：共振柱实验是用一种非常细粒度的材料进行的。 α-氧化铝（Al_2O_3），用作粒径在μm范围内的粘性土壤的模型材料。在这种粒径的情况下，范德华力和库仑相互作用的粒子间作用力会影响材料在动态剪切试验中的行为。通过调节表面电荷，从而调节库仑排斥力，我们获得了排斥或吸引颗粒，这会影响样品织物和剪切刚度。根据有效压力下小应变（γ≤10〜（-6））下的剪切刚度的增加，我们从平均力为0.8μm的约kPa范围内的表面力估计了净颗粒间压力。我们的结果表明，细颗粒状材料在小剪切应变下的行为不能仅通过其密度和应力状态来描述。必须考虑粒子表面力。

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