GEOTECHNICAL PROPERTIES AND GEOLOGI AGE ON CHARACTERISTICS OF LANDSLIDES HAZARDS OF VOLCANIC SOILS IN BALI, INDONESIA
Keywords:
Landslides, Volcanic soil, Geotechnical parameters, StabilityAbstract
Landslides in ancient mountains in Indonesia have occurred in various types, scales and
frequencies. Such variation seems to be determined by the weathering related to geological age. Hence, it is
deemed essential to study the distinctive condition of landslide on ancient volcanic rocks. It is aimed to observe
the features and avalanches that occur due to the geological age of ancient volcanic rocks in order to predict
future events and the identification of instability. Geotechnical parameters on volcanic rocks and geological
age were used for the interpretation of the instability. The interpretation of ancient volcanic rocks to the hazards
of landslides in this study was as an attempt to create an early warning system against the vulnerability of
landslides.The runoff movement is triggered by erosion in the channel valleys and the failure of the shear on
soil due to sharp increase of groundwater levels. The presence of bulking in the sediment and the run off has
led the surface material to be eroded from the upstream slope to the slopes. In comparison, landslides in a
metamorphic rock area are in the form of translational and rotational complex movements, whereas in ancient
volcanic rocks that formed at the pleistocene era, avalanches occur in the form of creep and the steep slope
debris flow occurs where the material surface drainage occurs because the loose material is relatively low slope
and strength parameters.