Development characteristics and formation mechanism of giant landslides on the main stream of the Jinsha River

The main stream of the Jinsha River traverses the highly complex topography and intense neotectonic movement of the southeastern edge of the Qinghai-Tibet Plateau, where a large number of giant landslides have formed, resulting in severe landslide disasters in the region. Therefore, in-depth investigation into the formation mechanisms of these landslides along the main stream of the Jinsha River is of paramount significance for disaster prevention and mitigation in this area. This study conducts a comprehensive exploration of formation mechanisms of these giant landslides using a combination of literature review and remote sensing image analysis. The findings reveal that the formation of giant landslides along the main stream of the Jinsha River is influenced by multiple factors. Firstly, topographical slope plays a crucial role, with a higher probability of landslide occurrence in the range of 25° to 40°. Secondly, active faults significantly contribute to the landslide formation process, as fault zone activity can lead to rock deformation and fragmentation, thus increasing the likelihood of landslide occurrence. Furthermore, the lithology of rock strata is also a key factor influencing landslides, impacting the physical and mechanical properties of rock-soil mass and the stress distribution characteristics of the slope, resulting in regional stability differences and an increased potential for landslides. These factors can lead to further development of landslides, and even trigger chain disasters such as river blockage, dam breach, and flooding in the basin.