非饱和土渗透系数曲线的分段简化模型

王晓峰; 时红莲; 王震; 吴柳东

doi:10.3969/j.issn.1001-5485.2015.02.016

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raybet体育在线院报 ›› 2015, Vol. 32 ›› Issue (2) : 72-77,83. DOI: 10.3969/j.issn.1001-5485.2015.02.016

岩土工程

非饱和土渗透系数曲线的分段简化模型

王晓峰^1,2,时红莲¹,王震¹,吴柳东¹

作者信息 +

Segmented Simplified Model for Hydraulic Conductivity Curve of Unsaturated Soil

WANG Xiao-feng^1,2,SHI Hong-lian¹,WANG Zhen¹,WU Liu-dong¹

Author information +

文章历史 +

摘要

根据影响非饱和土渗透系数变化的主要因素,选取合理特征点将土-水特征曲线划分成4个阶段。在此基础上,对大量数据进行统计分析,建立了一种分段简化模型,用于描述级配不良的非黏性土的非饱和渗透系数曲线,只需知道该模型中特征点的相关参数即可得到完整渗透系数曲线,并通过现有数据进行了验证分析。验证结果表明:在低基质吸力(0＜ψ≤ψ_a)时,lnK-ψ曲线呈线性变化;而当θ_b＜θ≤θ_a时,lnK-lnθ曲线也有类似变化规律。

Abstract

The soil-water characteristic curve is divided into four segments based on the main factors affecting the hydraulic conductivity coefficient of unsaturated soil. On this basis, a segmentation simplified model for hydraulic conductivity of unsaturated cohesionless soil with bad gradation was created. A complete predictive curve can be obtained just with a small amount of measured or calculated hydraulic conductivities of different moisture conditions. Curve of lnK-lnΨ at low matric suction(0<ψ<ψ_a)and curve of lnK-lnθ when θ_b<θ<θ_a are verified to be linear.

导出引用

王晓峰,时红莲,王震,吴柳东. 非饱和土渗透系数曲线的分段简化模型[J]. raybet体育在线院报. 2015, 32(2): 72-77,83 https://doi.org/10.3969/j.issn.1001-5485.2015.02.016

WANG Xiao-feng,SHI Hong-lian,WANG Zhen,WU Liu-dong. Segmented Simplified Model for Hydraulic Conductivity Curve of Unsaturated Soil[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(2): 72-77,83 https://doi.org/10.3969/j.issn.1001-5485.2015.02.016

中图分类号： TU411.91

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