Abstract
On 25 July 2021, a landslide caused by Super Typhoon In-Fa struck the village of Hongchi in Hangzhou City, Zhejiang Province, China. The volume of the landslide was about 5 × 104 m3. It blocked a county road for approximately 150 m and damaged six residential houses. The landslide had clear joint planes on both sides, which formed a wedge shape with an “undrained” boundary. The sliding mass was mainly composed of silty clay. To examine the initiation mechanism of the landslide, a detailed field investigation was conducted. It was found that the landslide had been affected by a fault crossing the main scarp, creating a quick seepage channel for the rainwater infiltrating into the sliding mass such that high pore-water pressure could be formed at the back of the sliding mass. Furthermore, the mechanisms of this landslide then were investigated by the particle size analysis, direct shear tests, and slope stability analysis. The geotechnical nature of the silty clay in the sliding zone may also have controlled the motion features of the landslide.
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Acknowledgements
The authors thank Zhejiang Geophysical and Geochemical Exploration Institute for providing topography data for our research. We also thank the Fuyang District Weather Station for providing the rainfall data for the Hongchi landslide area.
Funding
This study was supported by the National Natural Science Foundation of China (Grant No. 42107170), the China Postdoctoral Science Foundation (Grant No. BX2021214 and 2021M702493), and the Fundamental Research Funds of China for the Central Universities in Tongji University.
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Wang, F., Peng, X., Zhu, G. et al. The Hongchi landslide triggered by heavy rainfall from Super Typhoon In-Fa on 25 July 2021 in Hangzhou City, Zhejiang Province, China. Bull Eng Geol Environ 81, 411 (2022). https://doi.org/10.1007/s10064-022-02920-8
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DOI: https://doi.org/10.1007/s10064-022-02920-8