Experimental study to elucidate the generation mechanism of 'perched groundwater' between layers with large differences in hydraulic conductivity

抄録

In this study, we first conducted permeability tests in the laboratory under different conditions of compaction and moisture. From the test results, we clarified that the permeability of soils is strongly influenced by the initial degree of saturation during compaction. Based on these results, we made a model embankment possessing a layer with a large difference in hydraulic conductivity. After simulating rainfall by applying a certain amount of water, we confirmed the occurrence of “perched groundwater” within the embankment. In addition, seepage flow analysis of the model embankment suggested that spring water on the slope leads to early detection of “perched groundwater”.