Water Permeabiblity of Soils Partially Saturated by LNAPL
|關鍵字:||保持曲線;非水相液體;透水性;體積含水比;Retention Curve;Non-Aqueous Phase Liquid;Water Permeabiblity;Volunetric Water Content|
The main purpose of this study is to understand the hydraulic behavior between water and Non Aqueous Phase Liquid (NAPL) in soils partially saturated by NAPL. Tempe cells were used to determine the Soil Water Characteristic Curve (SWCC) and custom-made fix-wall permeability cells were used to determine the hydraulic conductivity in soils. The soils used in the study were Ottawa sand and Bow Shan sand. The NAPLs used were 95 gasoline, diesel, and heptane. The results of Tempe cell test showed that the larger the soil particles, the less the residual water content. In addition, the liquids with higher surface tension seem to have a better ability to remain in the soils. The results of permeability test showed that the liquids with higher surface tension of water have smaller water permeability at a given water volumetric content. In the other hand, the smaller the soil particles, the smaller the water permeability. To predict water permeability with Van Genuchten empirical formula with using SWCC data obtained during permeability test is more accurate. There is the largest difference between the results using scaling rules and the experimental data . However at a given water volumetric content, the results using empirical formula to predict water permeability and the experimental data is at the same order of magnitude. Therefore the results of using empirical formula to predict water permeability is acceptable when the results is applied to geotech engineering.
|Appears in Collections:||Thesis|