砂土渗透系数的细粒效应与其状态参数关联性

›› 2011, Vol. 32 ›› Issue (S2): 21-26.

砂土渗透系数的细粒效应与其状态参数关联性

孔令伟，李新明，田湖南

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071

收稿日期:2011-07-19 出版日期:2011-08-10 发布日期:2011-08-26
作者简介:孔令伟，男，1967年生，博士，研究员，博士生导师，主要从事特殊土的力学特性及灾害防治技术方面的研究
基金资助:
国家自然科学基金资助项目（No. 40372128）

Effect of fines content on permeability coefficient of sand and its correlation with state parameters

KONG Ling-wei, LI Xin-ming, TIAN Hu-nan

State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Received:2011-07-19 Online:2011-08-10 Published:2011-08-26

摘要/Abstract

摘要： 利用常规渗透仪进行了不同细粒含量砂土的渗透性能试验，通过引入粒间状态参量概念，探讨砂土渗透系数的细粒效应及其与表征砂土各种状态参数的相互关联性。发现砂土渗透系数总体上随细粒含量增加而减小，当细粒含量小于5%时影响较小；细粒含量在5%～10%时，渗透系数随细粒含量增加而急剧减小；而当细粒含量大于25%后，砂土的渗透系数则基本趋向相对稳定值。基于5种不同表征状态参数的拟合分析，表明采用现有常用的经验模型尚难以简便、有效地预测各种细粒含量砂土的渗透系数，而利用粉粒间孔隙比则能更好地反映细粒含量对渗透系数的影响，且其与渗透系数在半对数坐标内基本呈现线性关系，说明粒间状态参量适宜用来描述砂土渗透系数的细粒效应

关键词: 细粒含量, 砂土, 渗透试验, 渗透系数, 细粒间孔隙比

Abstract: The permeability test of sand with different contents of fines is performed by conventional permeameter, the effect of fines content on permeability coefficient of sand and its correlation with various characterized state parameters are discussed, in which the concept of inter-particle state parameter is employed. It is found that the permeability coefficient of silty sand decreases with the fines content increasing, when the fines content is less than 5%, the effect is very small, while in the range of 5%-10%, the permeability coefficient decreases with increase of fines content sharply, and tends to a relatively stable value under the condition of fines content more than the 25%. Base on the fitting analysis by five types of various characterized state parameters, it is shown that the present common empirical models can not predict the permeability coefficient of sand with different fines content simply and effectively. However the state parameter of void ratio of inter-fines can reflect the effect of fines content on the permeability coefficient of sand better; and its relation of void ratio of inter-fines and permeability coefficient is presented linear correlation in the semi-logarithm coordinates, it is indicated that the void ratio of inter-fines state parameter is suitable for describing the effect of fines content on the permeability coefficient of sand.

Key words: fines content, sand, permeability test, permeability coefficient, void ratio of inter-fines

中图分类号:

TU 43

孔令伟，李新明，田湖南. 砂土渗透系数的细粒效应与其状态参数关联性[J]. , 2011, 32(S2): 21-26.

KONG Ling-wei, LI Xin-ming, TIAN Hu-nan. Effect of fines content on permeability coefficient of sand and its correlation with state parameters[J]. , 2011, 32(S2): 21-26.

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