A SIMULATION MODEL FOR THE VOID PROPERTIES IN GRAVEL RIVERBED
A SIMULATION MODEL FOR THE VOID PROPERTIES IN GRAVEL RIVERBED
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砾石河床孔隙特性模拟模型
DOI：
10.2208/prohe.50.1021
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
S. Muhammad
中科院分区：
文献类型：
--
作者：
D. Tsutsumi;M. Fujita;S. Muhammad
提出了一种模拟颗粒堆积的方法，即将球形颗粒置于一个假想的矩形容器中。实验室实验中，六个不同大小的球形玻璃珠混合，并用于填充一个圆柱形容器，进行了评估的有效性的模拟方法。计算结果与实测结果吻合较好，表明该方法用于计算孔隙比是可靠的。进行了模拟，以阐明对数正态型颗粒尺寸分布的参数上的空隙比的依赖性。结果表明，当颗粒尺寸均匀（lnσ = 0.0）时，孔隙比很小，接近均匀球形颗粒的理论值（0.28）;当颗粒尺寸分布较小（lnσ = 0.01）时，孔隙比急剧增加（0.37），并随着标准差的增加而不断减小。
A method for simulating particle packing, in which the spherical particles were placed into a hypothetical rectangular vessel, was developed. A laboratory experiment, in which six different-sized spherical glass beads were mixed and used to fill a cylindrical vessel, was conducted to assess the validity of the simulation method. Good agreement between the calculated and observed results indicated that the simulation method is reliable for use in calculating the void ratio. Simulations were conducted to elucidate the dependency of the void ratio on parameters of a lognormal-type particle size distribution. These showed that when the particle size was uniform (lnσ = 0.0) the void ratio was small and close to the theoretical value for uniform-sized spherical particles (0.28); it increased drastically (0.37) when the particles had a small non-zero size-distribution (lnσ = 0.01), and decreased continuously with increasing standard deviation.