On the Permeability of the Coarse Materials at the Low Hyraulic Gradient.

低水力梯度下粗粒材料的渗透率。

• 批准号: 61560261
• 负责人: KONDOH Takeshi
• 金额: $ 0.96万
• 依托单位: Mie University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61560261/
• 关键词: Peameabilty of coarse material; Drain; 非ダルシー則; 準一様流れ

In this study, the experiment about the permeability of the coarse materials was carried out at the low hydraulic gradient. (Hydraulic gradient : i=0.005-0.1) It is not clear that the permeability of the coarse materials is valid to Darcy's Law or not especially at the low hydraulic gradient. This permeability is the important value when the drain system in the earth structure is one of important factors for the safety of structure.The materials used in this experiment were three kinds of glass beads with the diameter D=30mm,15mm and 5mm.The results obtained are as follows:1) The unconfined flow through the coarse materials is not valid to Darcy's Law between above mentioned hydraulic gradient.2) Similary, the confined flow through the coarse materials is not valid to Darcy's Law, too3) The exponent law as follows is valid to the flow through the coarse materials.v=a*i^b where v : velocity, i : hydraulic gradient and a , b : coefficients.4) As the results of analysys of the data obtained from experiments, the value of b is about 0.7. This is not valid to Darcy's Law.

在这项研究中，关于粗材料的渗透性的实验是在低液压梯度下进行的。 （液压梯度：i = 0.005-0.1）尚不清楚粗材料的渗透性对达西定律有效，或者在低液压梯度下是否有效。当地球结构中的排水系统是结构安全性的重要因素之一时，这种渗透性是重要的价值。本实验中使用的材料是三种玻璃珠，直径为d = 30mm，15mm，15mm和5mm。所获得的结果如下。 Darcy的定律，也是3）指数定律如下的指数定律对通过粗材料的流量有效。这对达西定律无效。