강우재현모형실험에 의한 불포화 화강암질 풍화토 사면의 간극수압 특성 = A Study on the Pore Water Pressure Characteristic of Unsaturated Weathered Granite Soil Slopes through Rainfall Simulation

다국어 초록 (Multilingual Abstract)

The present study implemented a simulated rainfall system, and perfon11ed simulation and numerical analysis according to rainfall and slope conditions using a model slope built with weathered granite soil. We analyzed the characteristics of changes in volumetric water content and pore water pressure measured in the simulation, and compared them with the results of numerical analysis. It took longer for the volumetric water content to reach the limit when rainfall intensity was high and the slope was steep and shorter when rainfall intensity was low and the slope was gentle. When rainfall intensity was low and the duration of rainfall was short, negative pore water pressure was higher and the time for restoration was shorter. On the contrary, when rainfall intensity was high and the duration of rainfall was long, it took a longer time to restore negative pore water pressure. In the results of rainfall simulation and numerical analysis, the distribution of volumetric water content and pore water pressure was similar between the two. However, the volumetric water content was different by up to 5%, and pore water pressure by up to 3 kPa. This is possibly because modeling in the program was not perfect in terms of several ground conditions including initial water content, compaction, the permeability of slope base, and porous plate, and because the model slope applied to the numerical analysis was too small and thus a small variation made a big difference in the results.