| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 92 === In-situ hydraulic conductivity tests have been widely used in field investigations for construction project nowadays. In this study, in order to estimate the cause of various outcomes, in-situ hydraulic testes such as Double-Ring Infiltrometer, Two-Stage Borehole Permeameter, Guelph Permeameter, and Simplified Borehole Test were conducted to compare their applicability in silty and clayey soils.
In addition, numerical analysis was performed with a finite-element program, FEMWATER, to further analyze the results of the in-situ tests. The tests were simulated with FEMWATER by using the hydraulic conductivity and soil water characteristic curves obtained from laboratory experiment. The effect of anisotropy of hydraulic conductivity was also studied. Due to the difficulty of quantifying the influence of macropores and fissures in the soils on the hydraulic conductivity, the soils were assumed to be homogeneous.
The study showed that the in-situ hydraulic conductivity obtained by the Guelph Permeameter was the lowest and the closest to that from the laboratory tests. On the other hand, the hydraulic conductivity measured by the Double-Ring Infiltrometer tests and Simplified Borehole tests difference were much greater. However, considering the effect of anisotropy and macropores of soil, Double-Ring Infiltrometer test could give more reliable results than Guelph Permeameter and Simplified Borehole Test.
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