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Failure mechanism and stability analysis of a reactivated landslide occurrence in Yanyuan City, China

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Abstract

This paper presents a recent rainfall-induced reactivated compound soil slide in Yanyuan County, China, on July 19, 2018. In this paper, according to the elaborate investigation of the soil slide area at field and prefailure slope stability analysis, the corresponding failure mechanisms are comprehensively studied. Unmanned aerial vehicle (UAV) based on remote sensing, three-dimensional modelling, in situ and laboratory experimental testing, borehole exploration, and numerical simulation were carried out in this work. According to the results, two different sliding processes were identified involving the main sliding and lateral collapse. The main sliding occurred as multiple stages along with two different types of slip zones, which involve a preexisting basal zone of the ancient landslide and an interlaminar shear zone within the ancient landslide deposits. The predominance of reactivated surface geomorphology provides a clue to elucidate the dominant compound movement of the event. Unconsolidated sliding mass and the basal sliding surface are ideal for the development of the reactivation motion. Saltatory microrelief of the original slope determined the retrogressive failure type of the soil slide. The well-developed groundwater in the landslide area significantly increased the soil mass saturation, with an average saturation value of 98%, formed dominant seepage in the sliding mass, and promoted landslide reactivation. Furthermore, rainwater infiltration due to 14 days’ antecedent cumulative rainfall of 350.6 mm directly contributed to the occurrence of the landslide by increasing the pore water pressure in the slope. The maximum shear plastic strain and displacement obtained by numerical simulation show that the lateral slope was unstable with the removal of the main sliding. Because the soil slide is located in the west area of the Emeishan Large Igneous Province (ELIP), it is a partial resurrection of the ancient basalt landslide. Therefore, this study has a certain significance for revealing the reactivated mechanism of basalt ancient landslide.

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Funding

This study was supported by the National Key Research and Development Program of China (2018YFC1505401) and the National Natural Science Foundation of China (41731285, 41907225).

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Authors and Affiliations

  1. Faculty of Geoscience and Environmental Engineering, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China

    Kun He, Xiewen Hu & Bo Liu

  2. School of Engineering, The University of Warwick, Coventry, CV4 7AL, UK

    Guotao Ma

  3. Engineering Laboratory Combined with National and Local of Spatial Information Technology of High-Speed Railway Operation Safety, Southwest Jiaotong University, Chengdu, 610031, Sichuan, China

    Xiewen Hu

Authors
  1. Kun He
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  2. Guotao Ma
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  3. Xiewen Hu
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  4. Bo Liu
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Correspondence to Guotao Ma or Xiewen Hu.

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He, K., Ma, G., Hu, X. et al. Failure mechanism and stability analysis of a reactivated landslide occurrence in Yanyuan City, China. Landslides 18, 1097–1114 (2021). https://doi.org/10.1007/s10346-020-01571-8

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  • DOI: https://doi.org/10.1007/s10346-020-01571-8

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