Dynamic simulation and analysis of “9·20” sliding process of Quwajiasa landslide in the upper reaches of Yellow River

Several local landslides occurred in the Quwajiasa giant landslide in the upper reaches of the Yellow River from 1985 to 2020, which seriously threatened the safety of G227 national highway and the housing security of the villagers below. Taking the H1 landslides at the middle front of the northeast section of Quwajiasa landslide on September 20, 2019 as an example, based on the field investigation, deformation data and stability analysis, this paper intends to research the deformation and failure characteristics of the landslide, further analyze the sliding range as it moves through dynamic simulation, and the back analysis validated that after the movement of the No.1 shallow landslide following the Frictional model, it accumulated in the highway G227 and residential area from the retaining wall to Jungong Road, however, the No.2 shallow landslide in unstable state was predicted to accumulat in the residential area from Jungong road to the Yellow River after its movement, which will not block the frontal. The research content of this paper can provide some reference for the evaluation method for dynamic prediction super large landslides in the upper reaches of the Yellow River.