Abstract
Long-term field monitoring finds that serious surface subsidence can still occur even if the high strength cemented fill method is adopted. Combining the results of numerical simulations with global position system (GPS) monitoring, we took a typical filling mining mine with a steeply inclined ore body as an example, and explored its ground subsidence mechanism. The results show that the ground subsidence caused by the mining of steep ore body is characterized by two settlement centers and a significantly uneven spatial distribution, which is visibly different from ground subsidence characteristic of the coal mine. The subsidence on the hanging wall is much larger than that on the footwall, and the settlement center tends to move to the hanging wall with the increase of mining depth. The backfill improves the strength and surrounding rock bearing capacity, which leads to a lag of about 3 years of the subsidence. However, under the actions of continuous and repeated mining disturbances, the supporting effect of the backfill can only reduce the amplitude of the deformation, but it cannot prevent the occurrence of settlement.
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Acknowledgments
The research received support from the National Natural Science Foundation of China (Grant Nos. 42072305 and 41831293). We appreciate the kind support. Besides, the authors would like to express their sincere gratitude to Jinchuan Mine for their data support. In addition, the authors are grateful to assigned editors and anonymous reviewers for their enthusiastic help and valuable comments which have greatly improved this paper.
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Data curation, LI Guang, LIU Shuai-qi and HUI Xin; formal analysis, LI Guang and GUO Jie; methodology, LI Guang and MA Feng-shan; software, LI Guang and LIU Shuai-qi; writing—original draft, LI Guang; writing—review and editing, LI Guang. and MA Feng-shan; investigation, LI Guang, LIU Shuai-qi and HUI Xin; funding acquisition, GUO Jie and MA Feng-shan. All authors have read and agreed to the published version of the manuscript.
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Data Availability: Data sets generated during the current study are available from the corresponding author on reasonable request.
Conflicts of Interest: The authors declare no conflicts of interest.
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Li, G., Liu, Sq., Ma, Fs. et al. Ground subsidence mechanism of a filling mine with a steeply inclined ore body. J. Mt. Sci. 20, 2358–2369 (2023). https://doi.org/10.1007/s11629-023-8027-4
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DOI: https://doi.org/10.1007/s11629-023-8027-4