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Stability Analysis of Secondary Mining of Submarine Mine Under the Clamping Control of Fault and Fracture Zone

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Abstract

Sanshandao Gold Mine is the only undersea metal mine in China. To deal with the collapse and pumping of stopes and roadways caused by complex ore-rock occurrence conditions, the mine conducts filling and sealing of some areas, and the remaining ore reserves will be mined after treatment. Therefore, it is urgent to evaluate the stability of rock masses, fault fracture zones, and aquicludes during the secondary mining process. In this study, displacement and microseismic methods are employed to monitor rock deformation and fractures. Additionally, FLAC3D was used to simulate the process of secondary mining, reproducing the evolution of stress fields, displacement fields, seepage fields, and plastic zones at different mining stages. The combination of numerical simulation and on-site monitoring verification demonstrates that the deformation of surrounding rock presents a rapid growth at the initial stage of mining, followed by a gradual decrease in the growth rate, and finally tends to stabilize; the fracture zone area at the 151–159 exploration line on the − 320 m level (near the 7# and 8# stopes) exhibits poor stability, and monitoring measures should be strengthened; the deformation value of the aquiclude is less than the deformation value of I protection level in the Code for Design, the impact of secondary mining on the aquiclude is limited; fault and fracture zone deteriorate rock mass stability, and their impact is related to their spatial locations. Hanging wall fault has a more significant impact on the settlement of the aquiclude, while the footwall fracture zone has a greater impact on the development of the plastic zone.

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Funding

The research described in this paper was financially supported by the “National Key R&D Program of China (2022YFC2905005),” “Open Foundation of State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (SKLGDUEK2022),” and “the General Program of National Natural Science Foundation of China (no. 51974012, no. 52074020).”

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Authors and Affiliations

  1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Wenhao Xia, Yang Li, Weidong Song, Jianxin Fu, Chao Zhang & Ling Yu

  2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, 100083, China

    Yang Li

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  1. Wenhao Xia
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  2. Yang Li
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Correspondence to Yang Li.

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Xia, W., Li, Y., Song, W. et al. Stability Analysis of Secondary Mining of Submarine Mine Under the Clamping Control of Fault and Fracture Zone. Mining, Metallurgy & Exploration 41, 909–924 (2024). https://doi.org/10.1007/s42461-024-00937-z

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