Comparison of testing techniques and models for establishing the SWCC of riverbank soils
Comparison of testing techniques and models for establishing the SWCC of riverbank soils
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DOI：
10.1016/j.enggeo.2009.09.003
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发表时间：
2010-01-10
影响因子：
7.4
通讯作者：
Munoz, Juan Jorge
中科院分区：
文献类型：
--
作者：
Nam, Soonkie;Gutierrez, Marte;Munoz, Juan Jorge
土壤水分特征曲线（SWCC）又称土壤持水曲线（SWRC），描述了非饱和土壤中含水量与土壤吸力之间的关系。含水量和吸力影响非饱和土的渗透性、抗剪强度、体积变化和变形性。本文介绍了从北卡罗来纳州下罗阿诺克河河岸采集的土壤样品SWCC的实验室测定结果。采用滤纸法、露点电位法、水蒸气平衡法、压力板法、滕佩池法和渗透法等6种不同的测试方法建立了土壤水环境系数。得出的结论是，每一个吸力测量技术提供了不同的吸力值的可测量范围，从不同的测试组合的结果提供连续的SWCC。三个广泛使用的模型也被证明是充分适合的实验SWCC数据，特别是基质吸力值低于1500 kPa。这些结果将是有价值的从业者在决定使用何种方法来建立SWCC，和经验关系，用于模拟河岸土壤SWCC。出版社：Elsevier B.V
The soil water characteristic curve (SWCC), also known as soil water retention curve (SWRC), describes the relationship between water content and soil suction in unsaturated soils. Water content and suction affect the permeability, shear strength, volume change and deformability of unsaturated soils. This paper presents results of the laboratory determination of the SWCC for soil samples obtained from the riverbank of the Lower Roanoke River in North Carolina. Six different testing methods were used to establish the SWCC including the filter paper, dewpoint potentiameter, vapor equilibrium, pressure plate, Tempe cell and osmotic methods. It is concluded that each suction measurement technique provides different measurable ranges of suction values, and the combined results from the different tests provide continuous SWCCs. Three widely available models were also shown to adequately fit the experimental SWCC data, particularly for matric suction values under 1500kPa. These results will be valuable to practitioners in deciding which methods to use to establish the SWCC, and which empirical relationship to use for modeling the SWCC of riverbank soils. Published by Elsevier B.V