ABSTRACT
Temi ancient landslide is a large scale ancient landslide dam upstream of the Batang hydropower station. It has become a major hidden danger threatening to the project because of the sensitive location and huge volume. Based on field investigation, mapping, and data exploration, the geological conditions, structural characteristics, and formation mechanism of the Temi landslide are deeply analysed. Furthermore, stability of the landslide is quantitatively evaluated. Research results show that: Temi landslide is a thrust-type landslide, and its failure mode is creep-cracking. The landslide is generally stable, but the landslide will have a local progressive collapse, The potentially unstable sliding body is located in the shallow part of the steep anterior border of the landslide. The maximum volume of the unstable sliding body is about 15.8 × 104m3, Further review show that the local instability of the anterior border unstable sliding body will not induce the overall failure of the landslide again.
