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Failure mechanism and evolution of the Jinhaihu landslide in Bijie City, China, on January 3, 2022

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Abstract

A gently dipping bedding landslide occurred on January 3, 2022, in Jinhaihu District, Bijie City, Guizhou Province, in a slope with a weak interbedding of relatively soft rock layers having a loose structure and poor mechanical strength. Fourteen persons were killed, 3 others were injured, and the site’s engineering infrastructure was also buried as a consequence of this landslide. Because the construction workers did not have sufficient time to avert the landslide, the rock mass slid toward the free face within a short period of time, resulting in tragedy. The field investigation revealed that after three levels of the slope were excavated, the weak interlayer was exposed to the surface, which provided the free face for the rock mass to slide down along the weak interlayer. According to the XRD results, the main mineral composition of the weak interlayer is illite, accounting for 56.5% of the total composition, indicating that the weak interlayer has strong water absorption and expansibility; the surface water penetrated along the joints and cracks of the upper rock mass to the weak interlayer, which reduced the strength of the weak interlayer and finally caused instability failure. The evolution of this landslide was revealed by numerical simulation using PFC2D. The research results are of great significance to the understanding of this kind of slope and can provide reference value for similar projects in the future.

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Acknowledgements

We thank Yaoqiang Zhu and Xiuwei Liu from Guizhou Geological Environment Monitoring Institute and Chengfu Yang from Regional Geological Survey Research Institute of Guizhou Bureau of Geology and Mineral Resources for providing us with valuable information.

Funding

This study is financially supported by the National Natural Science Foundation of China (Grant No. 42067046) and the Science and Technology Planning Project of Guizhou Province, China (Grant No. QKHJC-ZK[2021]YB228).

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Authors and Affiliations

  1. Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang, 550025, China

    Tongwei Tao & Wenbing Shi

  2. College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China

    Wenbing Shi & Feng Liang

  3. Mountain Geohazard Prevention R&D Center of Guizhou Province, Guiyang, 550025, China

    Feng Liang

  4. School of Civil Engineering, Central South University, Hunan, 410075, China

    Xiaoming Wang

Authors
  1. Tongwei Tao
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  2. Wenbing Shi
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  3. Feng Liang
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  4. Xiaoming Wang
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Correspondence to Wenbing Shi.

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Tao, T., Shi, W., Liang, F. et al. Failure mechanism and evolution of the Jinhaihu landslide in Bijie City, China, on January 3, 2022. Landslides 19, 2727–2736 (2022). https://doi.org/10.1007/s10346-022-01957-w

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  • DOI: https://doi.org/10.1007/s10346-022-01957-w

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