考虑初始孔隙比影响的非饱和土相对渗透系数方程

doi:10.11779/CJGE201405004

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摘要

基于饱和度随孔隙比变化的增量关系以及利用非饱和土土水特征曲线（SWCC）预测渗透系数的方法,建立了一种考虑初始孔隙比影响的非饱和土相对渗透系数间接预测方法。在非饱和土SWCC方程基础上,该方法只需增加一个参数,即可对某一种土在不同初始孔隙比条件下的相对渗透系数进行预测,通过与试验结果的对比,证实了所建立的预测模型的正确性。

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	蔡国庆
	盛岱超
	周安楠

关键词 ：非饱和土, 土水特征曲线, 渗透系数, 初始孔隙比

Abstract：

A simple approach is proposed to quantify the effect of the initial void ratio on the relative coefficient of permeability for unsaturated soils based on the incremental relationship between the degree of saturation and the initial void ratio and the prediction of the permeability function for unsaturated soils by use of the soil-water characteristic curve (SWCC). For a given soil and the SWCC equation, only one additional parameter is introduced, which can be conveniently calibrated by the conventional SWCC tests. The relative coefficient of permeability for the same soil with different initial void ratios can be predicted by this approach. The proposed approach is validated through experimental data from the literatures in which both the SWCCs and the coefficients of permeability with different initial void ratios are measured.

Key words： unsaturated soil soil water characteristic curve coefficient of permeability initial void ratio

收稿日期: 2013-09-10

TU441.33

基金资助:

国家自然科学基金项目（51208031，51278047）; 国家重点基础研究发展计划（973计划）项目（2010CB732100）

作者简介: 蔡国庆(1983- ),男,江苏镇江人,讲师,主要从事非饱和土本构关系及多场耦合等方面的研究工作。E-mail: guoqing.cai@.bjtu.edu.cn。

引用本文:

蔡国庆, 盛岱超, 周安楠. 考虑初始孔隙比影响的非饱和土相对渗透系数方程[J]. 岩土工程学报, 2014, 36(5): 827-835. CAI Guo-qing, SHENG Dai-chao, ZHOU An-nan. Approach for predicting the relative coefficient of permeability of unsaturated soils with different initial void ratios. Chinese J. Geot. Eng., 2014, 36(5): 827-835.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE201405004 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2014/V36/I5/827

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