Abstract
Large rocky landslides induced by underground mining are the primary type of geological disaster in the karst mountains of southwestern China. In this study, by integrating field surface surveys, interferometric synthetic aperture radar (InSAR) monitoring, and discrete element simulations, we analyzed the deformation evolution of steep cliffs with karst structural planes under mining disturbance. Based on the stress transfer, deformation response, and instability precursors, a landslide instability model was developed. The results revealed that the instability boundaries and the instability mode were controlled by the large structural plane at the top of the mountain. Underground mining accelerated the uneven subsidence of the overlying strata, which led to expansion and penetration of the karst fissure structural planes and fracturing of the rock base, which are the main reason for the instability of the mountain. Underground mining caused internal stress fluctuation of the overlying strata, and the mountain experienced four stages during this process, i.e., development of karst fissure structural planes, fissures expansion and rock base fracturing, further fissures expansion and rock base crashing, and fissures penetration and shear failure. The mining-induced failure of mountain with large karst structural planes can be described as tensile shear-fracturing crashing failure. The InSAR monitoring results revealed that accelerated deformation occurred in the source area starting 20 days before the Baiyan landslide. In addition, 25 potential deformation landslides were identified in Zhijin County, Guizhou Province. Hence, InSAR technology can be used for early-stage detection and warning of similar landslides.
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Acknowledgements
We would like to thank all anonymous reviewers, European Space Agency (ESA) and Japan Aerospace Exploration Agency (JAXA), for providing Sentinel-1/2 and AW3d30 DSM datasets, respectively. The optical images are downloaded from Map-World.
Funding
This study was conducted with financial support from the National Key Research and Development Program Program of China (No. 2018YFC1504806) and the National Science Foundation of China (Nos. 42177172, 41929001, and 41874005).
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Li, B., Zhao, C., Li, J. et al. Mechanism of mining-induced landslides in the karst mountains of Southwestern China: a case study of the Baiyan landslide in Guizhou. Landslides 20, 1481–1495 (2023). https://doi.org/10.1007/s10346-023-02047-1
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DOI: https://doi.org/10.1007/s10346-023-02047-1