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Field Investigation and Finite Element Analysis of Landslide-Triggering Factors of a Cut Slope Composed of Granite Residual Soil: A Case Study of Chongtou Town, Lishui City, China

Author

Listed:
  • Tiesheng Yan

    (Southern Zhejiang Comprehensive Engineering Surveying and Mapping Institute, Hangzhou 310030, China)

  • Jun Xiong

    (Southern Zhejiang Comprehensive Engineering Surveying and Mapping Institute, Hangzhou 310030, China)

  • Longjian Ye

    (Southern Zhejiang Comprehensive Engineering Surveying and Mapping Institute, Hangzhou 310030, China)

  • Jiajun Gao

    (School of Civil Engineering and Achitecture, Zhejiang Sci-Tech University, Hangzhou 310018, China)

  • Hui Xu

    (School of Civil Engineering and Achitecture, Zhejiang Sci-Tech University, Hangzhou 310018, China)

Abstract

Landslides caused by excavations and precipitation events are widespread types of slope failures in southwest Zhejiang, China, in areas with granite residual soil. Investigations of the effect of high precipitation on the hydrological response, stability, and evolutionary mechanism of cut slopes in granite soil areas are lacking. The characteristics of historical landslides in Chongtou Town in southwestern Zhejiang were summarized, and a typical slope was selected for analysis. The hydraulic and mechanical properties of the residual soil and fully weathered granite were tested, and the surface displacements on the slope were monitored. Geo-studio was utilized to establish a coupled seepage-deformation model to validate the numerical method and investigate the landslide-triggering factors of the cut slope. The results showed nearly all historical landslides in Chongtou Town were triggered by precipitation events, and the slide bodies consisted of residual soil and fully weathered granite with similar geotechnical properties. The simulated and measured horizontal displacements were in good agreement, indicating the reliability of the established model and parameters. The stability coefficient decreased with an increase in the gradient or height of the cut slope. The critical height values were 5.3 m, 5.5 m, 5.7 m, 6.0 m, and 6.3 m at slopes of 60°, 65°, 70°, 75°, and 80°, respectively. Long-term torrential rain and short-term high-intensity precipitation events are likely to trigger landslides when the precipitation event lasts longer than 26 h and 78 h, respectively. The landslide formation includes four stages: slope evolution, formation of unloading zone at slope foot, migration and loss of soil particles, and instability of the cut slope. The findings can be used to prevent and manage landslides on cut slopes in areas with granite residual soil.

Suggested Citation

  • Tiesheng Yan & Jun Xiong & Longjian Ye & Jiajun Gao & Hui Xu, 2023. "Field Investigation and Finite Element Analysis of Landslide-Triggering Factors of a Cut Slope Composed of Granite Residual Soil: A Case Study of Chongtou Town, Lishui City, China," Sustainability, MDPI, vol. 15(8), pages 1-25, April.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:8:p:6999-:d:1129489
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    References listed on IDEAS

    as
    1. Tian-shun Hou & Guang-li Xu & Da-qian Zhang & Hao-yu Liu, 2022. "Stability analysis of Gongjiacun landslide in the three Gorges Reservoir area under the action of reservoir water level fluctuation and rainfall," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 114(2), pages 1647-1683, November.
    2. Xinsheng Wei & Wen Fan & Xiaoqing Chai & Yanbo Cao & Yalin Nan, 2020. "Field and numerical investigations on triggering mechanism in typical rainfall-induced shallow landslides: a case study in the Ren River catchment, China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 103(2), pages 2145-2170, September.
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    Cited by:

    1. Hailin He & Xiujun Dong & Simin Du & Hua Guo & Yue Yan & Guohui Chen, 2024. "Study on the Stability of Cut Slopes Caused by Rural Housing Construction in Red Bed Areas: A Case Study of Wanyuan City, China," Sustainability, MDPI, vol. 16(3), pages 1-17, February.
    2. Yicheng Chen & Xiaowen Zhou & Xiaotao Ai & Mi Zhou & Yu Zhao & Zexin Lan, 2023. "Disintegration Characteristics of Remolded Granite Residual Soil with Different Moisture Contents," Sustainability, MDPI, vol. 16(1), pages 1-17, December.
    3. Wei Cao & Zheng Wan & Wenjing Li, 2023. "Stability of Unsaturated Soil Slope Considering Stratigraphic Uncertainty," Sustainability, MDPI, vol. 15(13), pages 1-24, July.

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