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Numerical modelling of the long runout character of 2015 Shenzhen landslide with a general two-phase mass flow model

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Abstract

High fluid content or pore-fluid pressure is generally the main reason for the triggering and high mobility of landslides. A catastrophic landslide occurred at Hongao construction waste dumpsite in the Guangming New District of Shenzhen, China, on Dec 20, 2015. Due to the high water content of soil in the source area, this landslide propagated over an extremely long travel distance, with maximum length and width of the affected area 1100 m and 630 m, respectively. High water content pesents a great challenge to numerical methods. In order to simultaneously include the evolution of the solid and fluid components in the mixture, a general two-phase mass flow model of Pudasaini (J Geophys Res 117: F03010, 2012) has been employed in our simulations. The complex interactions between the solid and fluid phases, including buoyancy, the virtual mass force, generalized drag and enhanced non-Newtonian viscous stress, are considered in this two-phase flow model. These are essential aspects in the motion of landslides consisting of viscous fluid and solid particles. Based on the actual geology and engineering conditions, runout characteristics of the Shenzhen landslide were analyzed numerically. The principal reasons for the long runout character and the inundation are discussed based on the physics-based model and high-resolution numerical results.

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Acknowledgements

This paper was supported by the National Key R&D Program of China (2017YFC1502502, 2017YFC1502506), National Nature Science Foundation of China (41672318,51679229,41372331),and 135 Strategic Program of the Institute of Mountain Hazards and Environment, CAS (No.SDS-135-1701). It was also supported by Youth Innovation Promotion Association of the Chinese Academy of Sciences (2018405). We sincerely thank two anonymous reviewers for their constructive and valuable suggestions, which help improving this manuscript substantially.

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Authors and Affiliations

  1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China

    Cheng Qiao, Guoqiang Ou & Huali Pan

  2. Key Laboratory of Mountain Surface Process and Hazards, Chinese Academy of Sciences, Chengdu, 610041, China

    Cheng Qiao, Guoqiang Ou & Huali Pan

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Cheng Qiao

  4. Anhui University of Science & Technology, Huainan, 232001, China

    Cheng Qiao

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  1. Cheng Qiao
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  2. Guoqiang Ou
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Correspondence to Huali Pan.

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Qiao, C., Ou, G. & Pan, H. Numerical modelling of the long runout character of 2015 Shenzhen landslide with a general two-phase mass flow model. Bull Eng Geol Environ 78, 3281–3294 (2019). https://doi.org/10.1007/s10064-018-1329-z

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