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An improved approach for evaluating the time-dependent stability of colluvial landslides during intense rainfall

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Abstract

The paper presents an improved analytical approach for evaluating the time-dependent stability of colluvial landslides during intense rainfall infiltration. The approach comprises two steps: first to simulate rainfall infiltration and then to compute the safety factor. In terms of the irregularity of the natural landslide surface in implementation of the method, the landslide is divided into several soil slices with approximately straight sides. Each single slice is regarded as a finite slope so that the infiltration formula and safety factor can be deduced. The infiltration formula is derived with combination of the Green–Ampt model and mass conservation law considering seepage perpendicular and parallel to slope surface simultaneously. In the modified infiltration model, both size effect and angle effect are vividly observed in the process of rainfall infiltration into the finite slope, while the former of which is not presented in the original Green–Ampt model. The safety factor is computed using the limit equilibrium method, with the influence of infiltrating water on the shear strength, gravity and seepage force of soil slices considered. By case study of the Shuping landslide in Three Gorges, decline in the safety factor and the decrease in the tendency are definite. Specifically under the rainfall intensity of 50 mm/h, the failure of Shuping landslide is most likely to occur at the time of 102 h. In addition, the results highlight shallow failure along the wetting front under intense rainfall.

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Acknowledgements

The work was supported by the Key Program of National Science Foundation of China (Grant No. 41230637) and the National Program on Key Basic Research Project of China (973 Program) (Grant No. 2011CB710600).

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Authors and Affiliations

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

    Ding-Jian Wang, Hui-Ming Tang, Chang-Dong Li & Lei Huang

  2. Department of Earth Sciences, The University of Hong Kong, Hong Kong, China

    Ya-Hui Zhang

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  1. Ding-Jian Wang
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  2. Hui-Ming Tang
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  3. Ya-Hui Zhang
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  4. Chang-Dong Li
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  5. Lei Huang
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Correspondence to Hui-Ming Tang or Chang-Dong Li.

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Wang, DJ., Tang, HM., Zhang, YH. et al. An improved approach for evaluating the time-dependent stability of colluvial landslides during intense rainfall. Environ Earth Sci 76, 321 (2017). https://doi.org/10.1007/s12665-017-6639-0

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