Abstract
Xinmo landslide buried the village and caused many casualties and property damage. After the landslide, a deformed block came into being on the left side of the landslide. Researchers mainly concentrated on the main body and the causes of the landslide without a systematic analysis of this block. This work is to discuss this block based on field investigation and UAV images. In the investigation, four scarps and three cracks were found. The lower two scarps indicated a downslope movement of the foot of the block, while the other two scarps and three cracks showed that main displacement of the block was towards to the free face formed in the landslide. Combined previous researches, it can be inferred that bedrock in the lower two scarps was the locking section, which stopped the movement of the block and the formation of the block can be divided into three stages. Then, two potential slipping direction were concluded and the FOS (Factor of Safety) were calculated with the Finite Element Method (FEM). Results show that the slip is more easily towards the free face which would do less harm. But it cannot be excluded that it would slip down the slope which could do much harm to the village and the road. So, monitoring is recommended on the foot of the block to get an advanced notice.
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Acknowledgements
This study has been financially supported by the National Natural Science Foundation of China (41790432), the NSFC-ICIMOD joint project (41761144077), the “Belt & Road” international cooperation team project of CAS (Su Lijun).
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Hu, B., Su, L., Xie, Q., Yu, F., Zhang, C. (2021). Formation Mechanism and Stability of the Instable Block Formed in Xinmo Landsilde. In: Arbanas, Ž., Bobrowsky, P.T., Konagai, K., Sassa, K., Takara, K. (eds) Understanding and Reducing Landslide Disaster Risk. WLF 2020. ICL Contribution to Landslide Disaster Risk Reduction. Springer, Cham. https://doi.org/10.1007/978-3-030-60713-5_17
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