Applicability of wetting front advancing method for measuring hydraulic conductivities of unsaturated soil

LI Xu; FAN Yi-kai; HUANG Xin

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Applicability of wetting front advancing method for measuring hydraulic conductivities of unsaturated soil

更新时间：2026-06-25

- Applicability of wetting front advancing method for measuring hydraulic conductivities of unsaturated soil
- Vol. 35, Issue 5, (2014)
- 作者机构：
  
  1. 武汉大学水资源与水电工程科学国家重点实验室,武汉,430072
  2. 北京交通大学土木建筑工程学院,北京,100044
  3. 北京航空航天大学交通科学与工程学院,北京,100083
  4. 空军第一建筑安装工程总队,北京,100083
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU411
- Online First：09 June 2014，
  
  Published：2014
- 稿件说明：
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LI Xu, FAN Yi-kai, HUANG Xin. Applicability of wetting front advancing method for measuring hydraulic conductivities of unsaturated soil[J]. 2014, 35(5).
DOI：

LI Xu, FAN Yi-kai, HUANG Xin. Applicability of wetting front advancing method for measuring hydraulic conductivities of unsaturated soil[J]. 2014, 35(5). DOI：

摘要

非饱和土渗透系数函数是非饱和土体渗流分析中必不可少的参数。然而非饱和土渗透系数函数测量非常困难，其中稳态法测量范围过于狭小，而瞬时截面法耗时动辄数月，难以应用。为此，提出了湿润锋前进法，有望在一周内测得渗透系数函数。采用数值模拟手段检验湿润锋前进法的测量精度和适用范围。数值模拟结果显示：对于砂土、粉土、黏土，湿润锋前进法得到的渗透系数函数均与输入的理论渗透曲线一致，但测量范围限于高吸力范围（大于进气值）。此外，还采用瞬时截面法计算了渗透系数函数，结果表明：瞬时截面法计算的渗透系数在理论渗透曲线附近波动，其精度取决于监测截面的间距，间距越大，精度越低。在给出的20、60、100 mm这3种间距中，20 mm间距时计算得到的渗透系数精度最高，但与湿润锋前进法的精度仍有一定差距。因此，湿润锋前进法是一种可靠的能够快速得到渗透系数函数的测量手段。

Abstract

Unsaturated hydraulic conductivity is a primary soil parameter required when performing seepage analyses for unsaturated soil. The measurement of unsaturated hydraulic conductivity is normally time-consuming and limited in a narrow range. Wetting front advancing method is newly developed for a rapid measurement of unsaturated hydraulic conductivity. It is capable to measure the hydraulic conductivity function in one week and over a wide suction and permeability range. In this paper

the accuracy of this method is investigated through numerical test. The results demonstrate that the soil hydraulic conductivity curve (SHCC) calculated by wetting front advancing method can agree with the “real” SHCC perfectly

i.e. the input PF. The instantaneous profile method is also used to calculate SHCC in the numerical test. The results indicate that the difference between the result data and the input SHCC increase with the increase of monitoring section space. A monitoring section space of 20 mm can result in a SHCC

which still worse than the data from the wetting front advancing method.

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