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Characteristics and dynamic process analysis of the 2018 Mabian consequent landslide in Sichuan Province, China

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Abstract

A consequent slope, comprising weak planes in the same dip direction along the slope face, is the most dangerous type of rock slope. Herein, a consequent landslide that occurred on May 5, 2018, in Mabian County, Southwest China, was investigated. This landslide occurred in a region with a complex geological background and strong geological activity and is considered a typical consequent landslide. Field investigations and aerial photographic interpretations revealed that the rock mass slipped along the contact surface of the strongly and moderately weathered rock mass, triggered by continuous rainfall. A depth-integrated continuum method was used to study the dynamic process of the landslide. The applicability of the depth-integrated method was verified by comparing the moving boundary of the landslide extracted from a video with the simulation results. The results show that the velocity of the landslide first increased and then decreased from the top to the bottom of the landslide and reached a maximum of 21 m/s in the middle of the landslide. Based on this method, we predicted the potential danger zones and velocity distribution of unstable masses next to the Mabian landslide. On comparing the calculated results of a depth-integrated continuum method with the Scheidegger method, in the case of the Mabian landslide, a reduction factor λ was added to the Scheidegger formula to achieve a modified formula that determines the velocity of such consequent landslides relatively accurately. This work could provide reference for the study of landslide velocity and disaster prevention.

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Acknowledgments

This research was funded by the Natural Science Foundation of China (Grant No. 41877266, 41790433), the National Key R&D Program of China (Grant No. 2017YFC1501000), the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Open Fund Research Project (Grant No. SKLGP2019K011), and the Youth Innovation Promotion Association. We wish to thank the anonymous referee for their careful reading and providing insightful comments to improve the initial version of this paper.

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Authors and Affiliations

  1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, Sichuan, China

    Dongpo Wang, Zhongwen Wang, Yizhi Li, Tianzhen Fan & Feng Ji

  2. University of Trento, 38100, Trento, Italy

    Dongpo Wang

  3. Key laboratory of Mountain Hazards and Surface Process & Institute of Mountain Hazards and Environment (IMHE), Chinese Academy of Sciences, Chengdu, 610041, China

    Chaojun Ouyang

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  1. Dongpo Wang
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  2. Zhongwen Wang
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  5. Chaojun Ouyang
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Correspondence to Chaojun Ouyang or Feng Ji.

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Wang, D., Wang, Z., Li, Y. et al. Characteristics and dynamic process analysis of the 2018 Mabian consequent landslide in Sichuan Province, China. Bull Eng Geol Environ 79, 3337–3359 (2020). https://doi.org/10.1007/s10064-020-01784-0

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