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Mechanical Model and Engineering Measurement Analysis of Structural Stability of Key Aquiclude Strata

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Abstract

Mining accidents due to inrushing water are caused by sudden changes in seepage owing to structural damage to key strata of the aquiclude. The backfill mining method can be used to control the movement of the strata, weaken the evolution of fractures owing to damage by key aquiclude strata (KAS), and control the channel for inrushing water. This study develops a mechanical model of a composite beam on a non-uniform elastic foundation of the KAS by analyzing the coupling relationship between the filling body and the key water-resisting layer of the aquiclude. Equations of the deflection-induced deformation, bending moment, and maximum tensile stress of the KAS are analyzed, formulae to calculate the allowable tensile stress and backfill materials’ compaction ratio (BMCR) to ensure structural stability are derived, and are used to provide the critical BMCR for their structural instability. The results of field measurements show that the subsidence of the roof was 600–700 mm with an average BMCR of 80.63%. Damage to the overlying strata was controlled to ensure safe mining and the disposal of solid waste from the aquifer. The research here is useful for ensuring safety during mining while protecting water resources.

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 52104152), and the China Postdoctoral Science Foundation (Grant No.2020M671650).

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Authors and Affiliations

  1. School of Mines, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China

    Qiang Sun, Yuzhuo Jiang, Dan Ma, Jixiong Zhang & Yanli Huang

  2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, 221116, Jiangsu, China

    Qiang Sun

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  1. Qiang Sun
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  2. Yuzhuo Jiang
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Correspondence to Qiang Sun.

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Sun, Q., Jiang, Y., Ma, D. et al. Mechanical Model and Engineering Measurement Analysis of Structural Stability of Key Aquiclude Strata. Mining, Metallurgy & Exploration 39, 2025–2035 (2022). https://doi.org/10.1007/s42461-022-00651-8

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  • DOI: https://doi.org/10.1007/s42461-022-00651-8

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