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将福建标准砂、杭州黄砂和人工石英砂制备成6个砂样,每个砂样只由一种粒径的砂颗粒组成,从每个砂样中选取一定数量的颗粒进行电镜扫描并分析砂样的颗粒平均粗糙度,用弯曲元测试仪测试各砂样在不同孔隙比下的剪切波速(Vs)。对比分析说明颗粒粗糙度对Vs的影响显著,Vs随着颗粒粗糙度的增大而减小。引入粗糙度修正系数,在散粒体介质细观组构与本构关系、弹性粗糙颗粒接触等研究的基础上推导了砂土Vs计算公式。将计算结果与试验实测值进行对比,得到了浅层砂土的粗糙度修正系数的计算方法,讨论了粗糙度修正系数随应力大小的变化趋势。
Fujian standard sand, Hangzhou yellow sand and artificial quartz sand were prepared into 6 sand samples, each sand sample consisted of only one particle size of sand particles, selected from each sand sample a certain number of particles for scanning electron microscopy and analysis of sand The average roughness of the particles was measured with a bending cell tester at various void ratios of shear wave velocity (Vs). The comparative analysis shows that the influence of particle roughness on Vs is significant, and Vs decreases with the increase of particle roughness. The roughness correction coefficient was introduced. Based on the study of the mesostructures and the constitutive relations of granular media, the contact of elastic coarse particles, the formula of Vs for sand was deduced. Comparing the calculated results with the experimental ones, the calculation method of the roughness correction coefficient of shallow sand is obtained, and the changing trend of the roughness correction coefficient with the magnitude of the stress is discussed.