International Session (Geotechnical Engineering)

[CS2-06] SHEAR BOX TEST ON ARTIFICIALLY MADE EXTREMELY LOOSE SOILS

〇RAJNI HIROSHIMA GURUGODA ARACHCHILAGE¹, Reiko Kuwano¹, Makoto Kuno¹ (1.The University of Tokyo)

Keywords:Extremely loose soil, slope failure, Shear box test, Crushability, Cementation effect, Contractancy

Volcanic soils consisting of high void ratio are widely distributed soil type in Japan due to the frequent occurrence of volcanic eruptions since the quaternary period and have caused several slope disasters. Ontake landslide, Takanodai landslide, Izu Oshima slope failure, Hokkaido landslide (2018) are some examples of the large-scale slope disasters that occurred on volcanic pumice layers. The crushability and cementation effect are the most distinctive features of these soil types. This study primarily focuses on slope disasters, such as muddy flow and long-distance flow, triggered by volcanic pumice layers with a high void ratio.