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>Evaluation of Uncertainty for Soil Water Characteristic Curve Measurements and the Implications for Predicting the Hydro-Mechanical Behavior of Unsaturated Soils
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Evaluation of Uncertainty for Soil Water Characteristic Curve Measurements and the Implications for Predicting the Hydro-Mechanical Behavior of Unsaturated Soils
Reproducibility of inter-specimen soil water characteristic curve (SWCC) measurements was quantified for four soil samples collected from the Sagehen Experimental Watershed near Truckee, California. The hanging column method, the UMS HYPROP apparatus, and the dew point potentiometer method provided measurement of the SWCC. The van Genuchten SWCC function was parameterized using regression on data from 10 HYPROP trials per soil and individual measurements from the hanging column. Variability in water content (9) was ± 0.03 to ± 0.13 at any given suction (Ψ), indicating random variability in SWCC prediction despite identical specimen preparation. Variability in replicate parameter estimates for a single soil may be greater than 14% of median estimates. This variability could affect strength testing reliant upon replicate specimen preparation. Additionally, this result may impact testing programs that commonly rely upon a single SWCC measurement and subsequent parameterization.
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机译：对从加利福尼亚特拉基附近的萨基恩实验流域收集的四个土壤样品进行了标本间土壤水特征曲线（SWCC）测量的可重复性。悬挂柱法，UMS HYPROP仪器和露点电位计法提供了SWCC的测量。 van Genuchten SWCC函数通过对每种土壤的10个HYPROP试验数据和悬挂柱的单独测量值进行回归来参数化。在任何给定的吸力下（water），水含量（9）的变化范围为±0.03至±0.13，这表明尽管样品制备方法相同，SWCC预测中仍存在随机性。单一土壤的重复参数估算值的变异性可能大于中值估算值的14％。这种差异可能会影响依赖于重复样本制备的强度测试。此外，此结果可能会影响通常依赖于单个SWCC测量和后续参数设置的测试程序。
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