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Formation mechanism and characteristics of the Jinjiling landslide in Wushan in the Three Gorges Reservoir region, China

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Abstract

The resettlement of residents to new urban areas in the Three Gorges Reservoir region, China, has generally adopted the local resettlement method, but engineering disturbances in conjunction with heavy rainfall have contributed to landslide instability. This paper discusses the influential factors and formation mechanism of the Jinjiling landslide in Jiangdong District, Wushan County, Chongqing, China. This study concludes that the cutting and filling of slopes have led to loading of the rear edge and open cut excavation at the downhill side of landslide. More importantly, the filling of channels with surface soil has blocked the surface water discharge channel along the landslide body, thereby transforming surface water into groundwater. Therefore, under heavy rainfall, the groundwater level in the Jinjiling landslide rose substantially, resulting in large deformation in approximately August 1, 2018. After emergency treatment, including groundwater pumping, the landslide deformation slowed considerably. The rising groundwater caused by filling of the slope was the key factor influencing the landslide. Based on the deformation characteristics and formation mechanism of the landslide, comprehensive control measures referred to as the “drainage+unloading+support” scheme are proposed, and drainage should be the focus of this type of landslide protection project. The results of this study may provide a reference for similar slope engineering projects.

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Funding

This study was supported by the National Key R&D Program (ID: 2018YFC1504803), the Geological Hazard Prevention and Control Project for Follow-up Work of the Three Gorges (ID: 000121 2019C C60 001 and 2018102849), and the Project from China Geological Survey (DD20190637).

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Authors and Affiliations

  1. Faculty of Engineering, China University of Geosciences, Wuhan, 430074, China

    Guoqiang Yan

  2. China Institute of Geo-environment Monitoring, Beijing, 100081, China

    Yueping Yin & Sainan Zhu

  3. Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang, 443002, China

    Bolin Huang

  4. 208 Geological Team, Chongqing, 400700, China

    Zhihua Zhang

Authors
  1. Guoqiang Yan
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  2. Yueping Yin
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  3. Bolin Huang
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  4. Zhihua Zhang
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  5. Sainan Zhu
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Correspondence to Yueping Yin.

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Yan, G., Yin, Y., Huang, B. et al. Formation mechanism and characteristics of the Jinjiling landslide in Wushan in the Three Gorges Reservoir region, China. Landslides 16, 2087–2101 (2019). https://doi.org/10.1007/s10346-019-01234-3

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  • DOI: https://doi.org/10.1007/s10346-019-01234-3

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