| In many of Japan’s more recent dams, the lower section is built on a foundation of weathered soft rock or unconsolidated sedimentary soft rock. To properly evaluate the permeability of this type of foundation, long-term testing should be carried out. However, this is not always practical due to time and cost restraints. This study clarifies the effect of the analysis conditions used for saturated-unsaturated seepage analysis, which simulates field permeability tests, on the unsteadiness of the injection flow rate and the stable flow rate. From the results, we propose a method for estimating the stable flow rate based on long-term permeability tests, using the test results during a appropriate testing time from practical viewpoint. Reproducibility of this method is verified through comparison with actual long-term test results. |
