| 快速测量非饱和土渗透系数的湿润锋前进法适用性研究 |
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| 引用本文： | 李 旭,范一锴,黄 新.快速测量非饱和土渗透系数的湿润锋前进法适用性研究[J].岩土力学,2014,35(5):1489-1494. |
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| 作者姓名： | 李 旭 范一锴 黄 新 |
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| 作者单位： | 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 |
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| 基金项目： | 水资源与水电工程科学国家重点实验室开放基金资助项目（No. 2010B075）；教育部新教师基金（No. 20110009120022）。 |
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| 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。
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| 关 键 词： | 非饱和土 非饱和渗透系数 湿润锋前进法 瞬时截面法 |
| 收稿时间： | 2013-01-12 |
Applicability of wetting front advancing method for measuring hydraulic conductivities of unsaturated soil |
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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].Rock and Soil Mechanics,2014,35(5):1489-1494. |
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| Authors: | LI Xu FAN Yi-kai HUANG Xin |
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| Institution: | 1.State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 3. School of Transportation Science and Engineering, Beihang University, Beijing 100083, China; 4. The First Construct and Installing Corporation of Air Force, Beijing 100083, China |
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| 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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| Keywords: | unsaturated soil unsaturated hydraulic conductivity wetting front advancing method instantaneous profile method |
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