A one-step outflow method for measuring hydraulic parameters of unsaturated soils

YI Pan-pan; WEI Chang-fu; CHEN Pan; MA Tian-tian

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A one-step outflow method for measuring hydraulic parameters of unsaturated soils

更新时间：2026-06-25

- A one-step outflow method for measuring hydraulic parameters of unsaturated soils
- Vol. 33, Issue 4, (2012)
- 作者机构：
  
  1. 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
  2. 武昌理工学院,武汉,430223
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU443
- Online First：26 April 2012，
  
  Published：2012
- 稿件说明：
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YI Pan-pan, WEI Chang-fu, CHEN Pan, et al. A one-step outflow method for measuring hydraulic parameters of unsaturated soils[J]. 2012, 33(4).
DOI：

YI Pan-pan, WEI Chang-fu, CHEN Pan, et al. A one-step outflow method for measuring hydraulic parameters of unsaturated soils[J]. 2012, 33(4). DOI：

摘要

详细介绍了改进的常流速联合测试系统，该系统增加了气泡冲刷和量测装置，能够冲刷试验过程中溢出陶土板的气泡并测量气泡的体积，进而对溢出水量进行修正，使测量值更加接近于真值。使用该系统对试样进行一步脱湿、吸湿流动试验，得出溢出水量随时间变化的关系曲线，利用HYDRUS-1D水分运移模型对该曲线进行拟合并得出相关参数。根据这些参数，反算得出试样脱湿段和吸湿段的土-水特征曲线和渗透函数并和实测数据进行对比。结果表明，该方法能很好的拟合实测溢出水量随时间变化的关系曲线，通过模型得出的土-水特征曲线和实测值比较接近，证实了该方法的可靠性。并且，与传统的测试方法相比，该方法能够节约大量的时间。因此，通过一步流动试验测定非饱和土-水力学参数的方法是可行的。

Abstract

An improved combined system with constant flow method and additional equipment to scour and quantify the air bubbles is introduced in detail. In order to make the measurement closer to the true value

we can correct the overflow of water by measuring the volume of the air bubbles. The curves of outflow with time are observed from one-step drying and wetting outflow experiment. The parameters which are evaluated using the HYDRUS-1D software are used to determine the drying and wetting soil-water characteristic curve (SWCC) and the hydraulic conductivity function. By comparing the measured data

it is shown that the method can fit the observed curves of outflow with time correctly so as to verity the reliability of the method. The difference of SWCCS between the estimated and measured is small. In addition

comparing with the traditional methods

the method proposed enables experiments to complete in a short period of time. Therefore

the method proposed for determining hydraulic parameters of unsaturated soils by one-step outflow test is feasible.

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YI Pan-pan1

WEI Chang-fu1

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CAO Hua-feng1

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Related Institution

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

Sichuan Institute of Geological Engineering Investigation

Three Gorges Research Center for Geo-hazards of Ministry of Education, China University of Geosciences

State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection, Chengdu University of Technology

School of Civil Engineering and Architecture, Hubei University of Technology

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