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Initiation mechanism and quantitative mass movement analysis of the 2019 Shuicheng catastrophic landslide

View ORCID ProfileJia-wen Zhou, Hai-bo Li, Gong-da Lu, Yue Zhou, Jie-yuan Zhang and Gang Fan
Quarterly Journal of Engineering Geology and Hydrogeology, 54, qjegh2020-052, 19 October 2020, https://doi.org/10.1144/qjegh2020-052
Jia-wen Zhou
1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, PR China
Roles: [Methodology (Equal)], [Validation (Equal)], [Visualization (Equal)]
  • Find this author on Google Scholar
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  • ORCID record for Jia-wen Zhou
  • For correspondence: jwzhou@scu.edu.cn
Hai-bo Li
2College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, PR China
Roles: [Data curation (Equal)], [Formal analysis (Equal)], [Funding acquisition (Supporting)], [Investigation (Equal)], [Validation (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Search for this author on this site
Gong-da Lu
1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, PR China
Roles: [Methodology (Equal)], [Visualization (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Search for this author on this site
Yue Zhou
2College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, PR China
Roles: [Methodology (Equal)], [Validation (Equal)], [Visualization (Equal)]
  • Find this author on Google Scholar
  • Search for this author on this site
Jie-yuan Zhang
1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, PR China
Roles: [Formal analysis (Equal)], [Investigation (Equal)], [Visualization (Equal)]
  • Find this author on Google Scholar
  • Search for this author on this site
Gang Fan
2College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, PR China
Roles: [Data curation (Equal)], [Investigation (Equal)], [Validation (Equal)]
  • Find this author on Google Scholar
  • Search for this author on this site
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Abstract

The 2019 Shuicheng landslide was a typical landslide in that failure occurred in the slope deposits and there was a close correlation with the antecedent rainfall. The initiation mechanism was analysed using field investigations, laboratory tests and numerical simulations and the characteristics of mass movement were quantitatively assessed. The numerical results indicated that the infiltration of rainfall decreased the shear resistance of the slope and increased the pore water pressure and soil weight, resulting in a large deformation of the slope and a gradual deterioration in its stability. After saturation, as the pore water pressure coefficient (ru) approached 0.3, the overall safety factor decreased to 1 and failure eventually occurred. Quantitative mass assessment showed that the unique terrain aggravated the erosion and entrainment effects and that the inclusion of loose material and water promoted the movement of the debris avalanche by changing it into a fluidized state, resulting in a much larger landslide volume with a long runout distance. As a result, the volume of the failed mass, which was calculated by an unmanned aerial vehicle and terrestrial laser scanning modelling techniques to be c. 4.7 × 105 m3 in the source area, almost quadrupled to >2.0 × 106 m3.

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Quarterly Journal of Engineering Geology and Hydrogeology: 54 (2)
Quarterly Journal of Engineering Geology and Hydrogeology
Volume 54, Issue 2
May 2021
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Initiation mechanism and quantitative mass movement analysis of the 2019 Shuicheng catastrophic landslide

Jia-wen Zhou, Hai-bo Li, Gong-da Lu, Yue Zhou, Jie-yuan Zhang and Gang Fan
Quarterly Journal of Engineering Geology and Hydrogeology, 54, qjegh2020-052, 19 October 2020, https://doi.org/10.1144/qjegh2020-052
Jia-wen Zhou
1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, PR China
Roles: [Methodology (Equal)], [Validation (Equal)], [Visualization (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Jia-wen Zhou
  • For correspondence: jwzhou@scu.edu.cn
Hai-bo Li
2College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, PR China
Roles: [Data curation (Equal)], [Formal analysis (Equal)], [Funding acquisition (Supporting)], [Investigation (Equal)], [Validation (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Gong-da Lu
1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, PR China
Roles: [Methodology (Equal)], [Visualization (Equal)], [Writing - Original Draft (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Yue Zhou
2College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, PR China
Roles: [Methodology (Equal)], [Validation (Equal)], [Visualization (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Jie-yuan Zhang
1State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, PR China
Roles: [Formal analysis (Equal)], [Investigation (Equal)], [Visualization (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Gang Fan
2College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, PR China
Roles: [Data curation (Equal)], [Investigation (Equal)], [Validation (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
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Initiation mechanism and quantitative mass movement analysis of the 2019 Shuicheng catastrophic landslide

Jia-wen Zhou, Hai-bo Li, Gong-da Lu, Yue Zhou, Jie-yuan Zhang and Gang Fan
Quarterly Journal of Engineering Geology and Hydrogeology, 54, qjegh2020-052, 19 October 2020, https://doi.org/10.1144/qjegh2020-052
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