Abstract
An example of unexpected landslide in crystalline schist is reported. After conventional investigation; such as a survey of ground surface, boring and ground water survey; a hill is cut partially at its toe to construct a new road. The degree of the cut slope was very low to maintain the slope stability. Then a landslide occurred after heavy rainfall. Additional surveys; thus, boring, standard penetration tests, and measuring by pipe strain meter and extensometer, were conducted. The shape of landslide was identified by means of these surveys. After considering several countermeasures to prevent landslide, earth removal work was selected, which stabilized the landslide. We propose an idea that new knowledge about unexpected landslide will be obtained by selecting a characteristic common to many landslides that occurred at various geological features and underground water level in Japan.
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