长江科学院院报 ›› 2013, Vol. 30 ›› Issue (11): 67-71.

• 岩土工程 • 上一篇    下一篇

以瞬态方法测试马兰黄土土-水特征曲线试验研究

郭龙a,刘清秉b,王菁莪b,雷雯a   

  1. 中国地质大学武汉a.工程学院;b.教育部长江三峡库区地质灾害研究中心,武汉430074
  • 收稿日期:2013-05-21 修回日期:2013-11-07 出版日期:2013-11-30 发布日期:2013-11-07
  • 通讯作者: 刘清秉(1984-),男,安徽芜湖人,助理研究员,主要从事岩土工程性质方面的研究工作,(电话)13419681857(电子信箱)qingbing@civil.uwa.edu.au。DOI:10.3969/j.issn.1001-5485.2013.11.0132013,30(11):67-71
  • 作者简介:郭龙(1990-),男,湖北仙桃人,硕士研究生,主要从事岩土体性质和地质灾害防治方面的研究工作,(电话)15871738058(电子信箱)cougarlong@126.com。
  • 基金资助:
    国家自然科学基金资助项目(41202199)

Soil-Water Characteristic Curve of Malan Loess by Transient Water Release and Imbibitions Method

GUO Long1,LIU Qing-bing2,WANG Jing-e2,LEI Wen1   

  1. 1.Faculty of Engineering,China University of Geosciences,Wuhan 430074, China;
    2.Three Gorges Research Center under Ministry of Education for Geo-hazard,China University of Geosciences,Wuhan 430074, China
  • Received:2013-05-21 Revised:2013-11-07 Online:2013-11-30 Published:2013-11-07

摘要: 选取陕西省子长县原状马兰黄土为研究对象,通过瞬态脱水和吸水(TWRI)试验方法,结合Van Genuchten(1980)土-水特征曲线模型和Mualem(1976)水力传导函数模型对土样的水-力作用参数进行反演计算,并绘制土-水特征曲线。试验结果表明,土样在不同脱湿和吸湿路径状态下的土-水特征曲线具有明显的回滞效应,其中,脱湿路径的进气值与饱和体积含水量分别为26 kPa和48%,不同干湿路径下与孔径分布有关的参数变化较小。为验证TWRI试验结果的正确性,针对同一个土样,采用2 Bar体积压力板仪对其基质吸力和体积含水量的关系进行稳态试验。对比以上2种方法的试验结果,可见瞬态脱水和吸水试验方法在低吸力范围内(0~300 kPa)的试验结果与压力板仪试验结果吻合较好,且具有试验周期短,测试吸力范围大的特点。

关键词: 非饱和马兰黄土, 土-水特征曲线, 瞬态脱水和吸水(TWRI)试验方法, 体积压力板仪

Abstract: A transient water release and imbibitions(TWRI) method together with Van Genuchten(1980) soil-water characteristic curve models and Mualem(1976) hydraulic conductivity function model was used for the inversion calculation of soil water-force parameters and the soil water characteristic curve(SWCC). The Malan loess at Zichang County in Shaanxi Province was selected as research object. Test results showed that the SWCC of soil samples under different drying and wetting states had apparent hysteresis effect. The air-entry value and saturated volumetric water content under drying state was 26 kPa and 48% respectively. Parameters related to pore size distribution changed slightly under different drying and wetting states. In order to verify the TWRI test results, steady-state test was carried out on the same soil sample using the volume 2 Bar pressure plate apparatus to study the relationship between their matrix suction and volumetric water content. By comparing the test results, it’s found that the test results of TWRI agrees well with that of pressure plate apparatus under low suction (0-300kPa). It has short test time and wide test range of matric suction.

Key words: unsaturated Malan loess, soil-water characteristic curve, transient water release and imbibitions(TWRI) method, volume pressure plate

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