Abstract
In recent years, landslides induced by underground mining have attracted much attention as they cause great harm and early warning signals are difficult to detect. The key work of the early warning of a mining landslide is to clarify its initiation mechanism and evolution process. Due to the complexity of the deformation and failure of the goaf overburden and the lack of monitoring of the slope evolution process, the deformation and failure law and evolution characteristics of mining landslides have always been difficult to analyze. In this paper, a typical mining landslide, the Madaling landslide, was selected as the study object. The soft-hard interlayer structure of the slope was generalized and explored by centrifuge model tests and a 3D discrete element model. The results showed that the evolution of the Madaling landslide are divided into four stages: (I) the bending and collapse of the goaf overburden, the slope settlement and the formation of tensile cracks at the trailing edge; (II) the upwards extension of the subsidence cracks of the rock mass; (III) the occurrence of shear cracks in the rock mass, with gradual slope deformation as a whole; and (IV) the connection of shear cracks, with the initiation of landslides. The long-term gravity creep of soft rock and the extension of trailing edge tensile cracks cause the internal rock mass of the slope to become the key block controlling slope stability. The slope surface displacement (S)-time (t) curve of mining landslides is divided into the settlement stage, rock mass crack development stage and landslide evolution stage. The formation time of shear cracks in the rock mass crack development stage is a sign of the transformation of subsidence into a landslide. The relationship between the horizontal displacement and the depth of the rock mass effectively reflects the development stage of shear cracks. The horizontal and vertical displacement of the deep rock mass can serve as the early warning criterion for mining landslides.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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The code used or analyzed during the current study is available from the corresponding author on reasonable request.
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Acknowledgements
We gratefully acknowledge the helpful editing of the American Journal Experts (www.aje.com).
Funding
The research present in this manuscript is funded by National Natural Science Foundation of China (Grant No. 41877273), the Innovative Research Groups of the National Natural Science Foundation of China (Grants No. 41521002), and the Science and Technology Plan Project of Sichuan Province (Grant No.2021YJ0053).
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Lai Qiyi: conceptualization, data curation, participated in centrifuge model tests and numerical simulation, formal analysis, writing—original draft, writing—review and editing. Zhao Jianjun: investigation, resources, funding acquisition, methodology, project administration, writing—review and editing Shi Bin: participated in centrifuge model tests, writing—review and editing Liu Haofang: participated in centrifuge model tests, writing—review and editing Ji Lan: participated in centrifuge model tests and numerical simulation, editing Li Qingmiao: validation, visualization Huang Runqiu: supervision
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Lai, Q., Zhao, J., Shi, B. et al. Deformation evolution of landslides induced by coal mining in mountainous areas: case study of the Madaling landslide, Guizhou, China. Landslides 20, 2003–2016 (2023). https://doi.org/10.1007/s10346-023-02069-9
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DOI: https://doi.org/10.1007/s10346-023-02069-9