Analysis of Formation-Evolution Mechanism and Stability Assessment of Zhanggu Landslide in Daduhe River
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Abstract:
The Zhanggu Landslide lies at the right bank of the Daduhe River and 2.5 km downstream of Guza Town, which is a super large-scale landslide with a volume of 19000×104 m3. This area belongs to the highly seismic region. Once the landslide is damaged, it can result in river blocking and dam break. In order to analyze the evolution process and develop trend of the landslide, the field investigation, geological mapping, geophysical prospecting, and laboratory dating methods were used to investigate the formation-evolution mechanism and stability of the Zhanggu Landslide based on the numerical simulation using the three-dimensional finite element software (FLAC-3D). The results showed that the Zhanggu Landslide is a palaeo-earthquakr landslide and its formation includes four stages: unloading and relaxation of the Daduhe River, lateral erosion of the Daduhe River, slope failure triggered by a strong earthquake, and river dam erosion. At present, the landslide is in stable condition but a secondary landslide may occur on the local scale.
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