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Simulation experiment study on the activity law of deep overburden with large mining

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Abstract

Deep and thick coal seam mining will occupy a very important position in our country’s future coal production, and deep large mining height comprehensive mining is an inevitable trend of deep and thick coal seam mining in our country. Through the overlying rock layer ‘three zones’ height theoretical calculation analysis, two-dimensional similar material simulation and UDEC software simulation, the movement and stress evolution of the overlying rock layer in the deep mining height mining yard, the law of the has been studied. The results show that the theoretical calculation has obtained the formula for the height of “three zones” of overburden rock in the high mining area of Pingmei mine, and the similar material simulation test and numerical simulation have verified the theoretical correction formula for the height of “three zones” of overburden rock. The results of both 3DEC simulations and similar material simulation experiments have obtained the activity law of overburden rock in the deep high mining area that after the workface advances 28 m from the open-cutting eye, the direct top collapse initially, and the top slab collapses periodically as the workface advances; and the periodic collapse step is 13 ~ 22 m; the height of the fall zone is generally about 14 m, which is about 2.3 times of the mining height, and the height of the fissure zone is 86 m, which is 14.times of the mining height; the overlying rock layer of the deep large mining site has inverted trapezoidal cut-off, and the convergence speed at the boundary of the open-cutting eye side is obvious. The pressure of the overburden rock in the deep high mining field changes dynamically with the mining of coal seam, which can be roughly divided into five zones: unaffected zone, stress increase zone, stress decrease zone, stress recovery zone, and stress re-stabilization zone. The study of the overburden rock movement and stress evolution law in deep large-height quarry is not only of great practical significance for guiding deep mines to adopt large-height comprehensive mining, but also can lay the foundation for deep compound dynamic hazard assessment.

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Funding

This work was financially supported by the National Key Research and Development Program of China (No.51774173).

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Authors and Affiliations

  1. School of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China

    Baoxin Jia, Hao Chen & Chengfang Yang

  2. Institute of Geology, China Earthquake Administration, Beijing, 100000, China

    Baoxin Jia

  3. School of Mechanics and Engineering, Liaoning Technical University, Fuxin, 123000, China

    Zhi Tang

Authors
  1. Baoxin Jia
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  2. Hao Chen
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  3. Chengfang Yang
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  4. Zhi Tang
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Correspondence to Hao Chen.

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Responsible Editor: Murat Karakus

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Jia, B., Chen, H., Yang, C. et al. Simulation experiment study on the activity law of deep overburden with large mining. Arab J Geosci 15, 551 (2022). https://doi.org/10.1007/s12517-022-09822-9

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  • DOI: https://doi.org/10.1007/s12517-022-09822-9

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