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[1]闫迪,付磊,夏超凡,等.颗粒粒径和吸附水膜对细粒土渗透性的影响[J].南京工业大学学报(自然科学版),2018,40(05):118-123.[doi:10.3969/j.issn.1671-7627.2018.05.019]
 YAN Di,FU Lei,XIA Chaofan,et al.Effects of grain size and adsorbed water on permeability of fine grained soil[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2018,40(05):118-123.[doi:10.3969/j.issn.1671-7627.2018.05.019]
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颗粒粒径和吸附水膜对细粒土渗透性的影响()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
40
期数:
2018年05期
页码:
118-123
栏目:
出版日期:
2018-09-20

文章信息/Info

Title:
Effects of grain size and adsorbed water on permeability of fine grained soil
文章编号:
1671-7627(2018)05-0118-06
作者:
闫迪付磊夏超凡宋林辉
南京工业大学 数理科学学院,江苏 南京 211800
Author(s):
YAN DiFU LeiXIA ChaofanSONG Linhui
College of Physical and Mathematical Sciences,Nanjing Tech University,Nanjing 211800,China
关键词:
细粒土 颗粒粒径 吸附水膜 孔隙率 渗透性
Keywords:
fine grained soil grain size adsorbed water porosity permeability
分类号:
TU441
DOI:
10.3969/j.issn.1671-7627.2018.05.019
文献标志码:
A
摘要:
细粒土的渗透性因受诸多因素影响而难以通过计算准确得到。对此,将其简化为单一粒径球形颗粒的堆积体,建立基于最密实状态下四方堆积方式的土颗粒堆积模型,并采用基本单元对堆积模型的几何特征进行分析。研究发现:只要堆积体和颗粒间的尺寸比超过10 000,细粒土的孔隙率就与粒径无关; 但随吸附水膜的增加而减小,渗透系数随粒径减小而急剧减小,随水膜厚度增大而大体呈减小趋势,但不同粒径减小幅度不同,较大颗粒(粒径大于0.05 mm)减小幅度很小,且基本呈线性趋势,极细颗粒(粒径小于0.001 mm)减小幅度很大,且呈非线性趋势。已有渗透试验测试值验证了不同粒径和水膜厚度下渗透系数计算值的变化趋势,且黏粒渗透系数的计算值与实测值吻合很好。
Abstract:
It is difficult to calculate accurately the permeability of fine grained soil due to many influence factors.The soil particle accumulation model was established based on the quadrangle accumulation method at the densest state in which the fine grained soil was simplified to the bulk accumulated by spherical particles with same diameter.The basic unit was used to analyze the geometric characteristics of the model.It was found that the porosity of bulk was not related to the particle size,but decreased with the increase of the adsorbed water film,as long as the size ratio between the bulk and the particle was more than 10 000.The permeability coefficient decreased sharply with the decrease of particle size,and the trend was decreased with the increase of the water film thickness.The reduction of different particle sizes was different.For larger particles(>0.05 mm),the decrease range of permeability coefficient was very small,while the fine particles(<0.001 mm)decreased greatly by nonlinear trend.The variation trend of the calculated value of permeability coefficient under different particle sizes and water film thickness were verified by the existing results of seepage tests,especially for clay particle,and the calculated values were in good agreement with the measured ones.

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备注/Memo

备注/Memo:
收稿日期:2017-04-18
基金项目:江苏省博士后基金(1302012A)
作者简介:闫迪(1992—),女,河南周口人,硕士,主要研究方向为岩土工程; 宋林辉(联系人),副教授,E-mail:h27991@163.com.
引用本文:闫迪,付磊,夏超凡,等.颗粒粒径和吸附水膜对细粒土渗透性的影响[J].南京工业大学学报(自然科学版),2018,40(5):118-123..
更新日期/Last Update: 2018-09-30