Long-runout fluidization disaster simulation analysis of clastic landslide under heavy rainfall: A case study of the Niuerwan landslide
The frequent occurrence of remote landslide disasters under heavy rainfall in the mountainous area with sand-mudstone strata in southwest China is a critical issue to be solved in disaster prevention and mitigation. Taking the July 13, 2020 Niuerwan landslide in Wulong, Chongqing as an example, tech...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
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Institute of Geomechanics, Chinese Academy of Geological Sciences
2022-12-01
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| Series: | Dizhi lixue xuebao |
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| Online Access: | https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.20222833 |
| _version_ | 1811164990062723072 |
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| author | WU Weile HE Kai GAO Yang LI Bin LIU Pengfei |
| author_facet | WU Weile HE Kai GAO Yang LI Bin LIU Pengfei |
| author_sort | WU Weile |
| collection | DOAJ |
| description | The frequent occurrence of remote landslide disasters under heavy rainfall in the mountainous area with sand-mudstone strata in southwest China is a critical issue to be solved in disaster prevention and mitigation. Taking the July 13, 2020 Niuerwan landslide in Wulong, Chongqing as an example, technical means including UAV image, field investigation, geological condition analysis, and PFC3D simulation were used to study the long-runout motion model of flowslide under heavy rainfall. The results show that the unique stratigraphic structure (Quaternary residual slope soil in the upper part and sand-mudstone in the lower part) is the root cause of the landslide instability and long-runout fluidization movement. Heavy rainfall is the key factor in causing the deep destabilization and overall decline of the landslide, and it also leads to the long-distance movement of the upper saturated residual soil. The long-runout fluidization disaster model of bedding landslide shows the characteristics of overall sliding of the lower layer, mixing of coarse and fine particles of the middle layer, and saturation fluidization in the upper layer. The long-runout fluidization process can be divided into three stages: the overall instability, the mixed acceleration, and the fluidization accumulation. Based on the above research, it is concluded that the investigation and prediction process of long-runout fluidization landslide in the mountainous area with sand-mudstone strata should be based on this particular disaster model to provide a quantitative scientific basis for disaster prevention and mitigation. |
| first_indexed | 2024-04-10T15:30:17Z |
| format | Article |
| id | doaj.art-7aee2dfec7894e93b3583961cf98cc2d |
| institution | Directory Open Access Journal |
| issn | 1006-6616 |
| language | zho |
| last_indexed | 2024-04-10T15:30:17Z |
| publishDate | 2022-12-01 |
| publisher | Institute of Geomechanics, Chinese Academy of Geological Sciences |
| record_format | Article |
| series | Dizhi lixue xuebao |
| spelling | doaj.art-7aee2dfec7894e93b3583961cf98cc2d2023-02-14T01:15:05ZzhoInstitute of Geomechanics, Chinese Academy of Geological SciencesDizhi lixue xuebao1006-66162022-12-012861115112610.12090/j.issn.1006-6616.20222833dzlxxb-28-6-1115Long-runout fluidization disaster simulation analysis of clastic landslide under heavy rainfall: A case study of the Niuerwan landslideWU WeileHE Kai0GAO YangLI BinLIU Pengfei1Key Laboratory of Active Tectonics and Geological Safety, Ministry of Natural Resources, Beijing 100081, ChinaChongqing Institute of Geological Environment Monitoring, Chongqing 401122, ChinaThe frequent occurrence of remote landslide disasters under heavy rainfall in the mountainous area with sand-mudstone strata in southwest China is a critical issue to be solved in disaster prevention and mitigation. Taking the July 13, 2020 Niuerwan landslide in Wulong, Chongqing as an example, technical means including UAV image, field investigation, geological condition analysis, and PFC3D simulation were used to study the long-runout motion model of flowslide under heavy rainfall. The results show that the unique stratigraphic structure (Quaternary residual slope soil in the upper part and sand-mudstone in the lower part) is the root cause of the landslide instability and long-runout fluidization movement. Heavy rainfall is the key factor in causing the deep destabilization and overall decline of the landslide, and it also leads to the long-distance movement of the upper saturated residual soil. The long-runout fluidization disaster model of bedding landslide shows the characteristics of overall sliding of the lower layer, mixing of coarse and fine particles of the middle layer, and saturation fluidization in the upper layer. The long-runout fluidization process can be divided into three stages: the overall instability, the mixed acceleration, and the fluidization accumulation. Based on the above research, it is concluded that the investigation and prediction process of long-runout fluidization landslide in the mountainous area with sand-mudstone strata should be based on this particular disaster model to provide a quantitative scientific basis for disaster prevention and mitigation.https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.20222833niuerwan landslidefluidizationhigh-elevation and long-runoutbedding landslide |
| spellingShingle | WU Weile HE Kai GAO Yang LI Bin LIU Pengfei Long-runout fluidization disaster simulation analysis of clastic landslide under heavy rainfall: A case study of the Niuerwan landslide Dizhi lixue xuebao niuerwan landslide fluidization high-elevation and long-runout bedding landslide |
| title | Long-runout fluidization disaster simulation analysis of clastic landslide under heavy rainfall: A case study of the Niuerwan landslide |
| title_full | Long-runout fluidization disaster simulation analysis of clastic landslide under heavy rainfall: A case study of the Niuerwan landslide |
| title_fullStr | Long-runout fluidization disaster simulation analysis of clastic landslide under heavy rainfall: A case study of the Niuerwan landslide |
| title_full_unstemmed | Long-runout fluidization disaster simulation analysis of clastic landslide under heavy rainfall: A case study of the Niuerwan landslide |
| title_short | Long-runout fluidization disaster simulation analysis of clastic landslide under heavy rainfall: A case study of the Niuerwan landslide |
| title_sort | long runout fluidization disaster simulation analysis of clastic landslide under heavy rainfall a case study of the niuerwan landslide |
| topic | niuerwan landslide fluidization high-elevation and long-runout bedding landslide |
| url | https://journal.geomech.ac.cn//article/doi/10.12090/j.issn.1006-6616.20222833 |
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