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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：为来自加利福尼亚州的鼠尾草实验流域收集的四种土壤样本量化了标本型土壤水特征曲线（SWCC）测量的再现性。悬挂柱法，UMS Hyprop装置和露点电位计方法提供了SWCC的测量。 Van Genuchten SWCC功能使用来自每种土壤10个Hyprop试验的数据和悬挂柱的单个测量来参数化。在任何给定的抽吸（ψ）下，水含量（9）的可变性为±0.03至±0.13，表明SWCC预测中的随机可变性尽管样品制备相同。单个土壤复制参数估计的变异可能大于中值估计的14％。在复制样品制备时，这种变异可能会影响强度测试依赖性。此外，此结果可能会影响通常依赖于单个SWCC测量和后续参数化的测试程序。
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