This study aims to investigate the effects of fine content on the mechanical behavior of embankments constructed from volcanic soil subjected to rainfall and earthquake. To accomplish this purpose, a series of 1 g model experiments on slopes using Komaoka volcanic coarse-grained soils as materials was conducted with a spray nozzle and shaking table. In the experiments, shear strain, acceleration, pore water pressure, and saturation degree were monitored and measured to provide an understanding of the failure mechanism of the model embankment with different fine particle contents during post-rainfall earthquakes. The results show that the increase in the fines content of the volcanic soil reduces the permeability of the volcanic embankment but has no significant effect on rainfall-induced slope failure until the shear strain is less than 6%. Moreover, the seismic resistance of volcanic slopes subjected to previous rainfall increases when the fine particle content increases to a certain threshold of about 27%.
Every year, slope failures such as landslides and debris flow on natural and artificial slopes cause great loss of life and property. The purpose of this study is to investigate the stability of the embankments constructed by coarse-grained volcanic soils under post-rainfall earthquakes like dual hazards in history (e.g., Typhoon Jebi and the 2018 Hokkaido Eastern Iburi earthquake). To accomplish the purpose, a series of 1g experiments on model slopes with Komaoka volcanic soils as material were performed using a spray nozzle and a shaking table. The experimental results showed that preceded rainfall greatly influences the stability of the embankment under subsequent earthquakes. Moreover, by comparing the result of this study with those of experiments on model embankments subjected to post-earthquake rainfall, it showed that the stability of the slope would change due to the different order of external force even if the previous shear strain induced is similar.
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