| Affiliation: | (1) Forestry and Forest Products Research Institute, 1 Matsunosato, 305-8687 Tsukuba, Ibaraki, Japan;(2) National Research Institute for Earth Science and Disaster Prevention, 3-1 Tennodai, 305-0006 Tsukuba, Ibaraki, Japan;(3) International Consortium on Landslides (ICL), Research Centre on Landslide, Disaster Prevention Research Institute, Kyoto University, Gokasho, 611-0011 Uji, Kyoto, Japan;(4) Chiba University, 1-33 Yayoi Inage, 263-8522 Chiba, Chiba, Japan;(5) Research Centre on Landslide, Disaster Prevention Research Institutes, Kyoto University, Gokasho, 611-0011 Uji, Kyoto, Japan |
| Abstract: | An experiment to induce a fluidized landslide by artificial rainfall was conducted on a natural slope at Mt. Kaba-san in the village of Yamato, Ibaraki Prefecture, Japan. The experimental slope was 30 m long, 5 m wide, and the average slope gradient was 33°. A landslide initiated 24,627.5 s (410 m/27.5 s) after the start of sprinkling at a rainfall intensity of 78 mm/h. The landslide mass was 14 m long and 1.2 m deep (at maximum). It first slid, then fluidized, and changed into a debris flow. The travel distance was up to 50 m in 17s. The apparent friction angle of the fluidized landslide was 16.7°. Formation of the sliding surface was detected by soil-strain probes. Motion of the surface of the failed landslide mass was determined by stereo photogrammetry. |
