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Control mechanism of a cable truss system for stability of roadways within thick coal seams

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Abstract

Cable truss systems have been widely applied in roadways with complicated conditions, such as the large cross-sections of deep wells, and high tectonic stress. However, they are rarely applied to roadways with extremely thick coal seams because the control mechanism of the system for the deformation of the roof and the separation between coal rock segments is not completely understood. By using the relationship between the support system and the roof strata, a mechanical model was established to calculate the deformation of the roof in a thick coal seam with bedding separation under different support conditions: with an anchor truss support and without support. On this basis, the research was used to deduce a method for computing the minimum pre-tightening forces in the anchor truss, the maximum amounts of subsidence and separation with, and without, anchor truss support under the roof, and the maximum subsidence and the decreasing amounts of the separation before and after adopting the anchor truss. Additionally, mechanical relationships between the minimum pre-tightening force and the anchoring force in the anchor were analyzed. By taking a typical roadway with thick coal roof as an example, the theoretical results mentioned above were applied in the analysis and testing of a roof supporting project in a roadway field to verify the accuracy of the theory: favorable experimental results were achieved. In addition, the relationships among other parameters were analyzed, including the minimum pre-tightening forces applied by the anchor truss, the angle of inclination of the anchor cable, and the array pitch. Meanwhile, the changing characteristics of the amounts of roof separation and subsidence with key parameters of the support system (such as array pitch, pre-tightening force, and inclination angle) were also analyzed. The research results revealed the acting mechanism of the anchor truss in control of roadway stability with a thick coal seam, providing a theoretical basis of its application in coal mining.

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Author information

Authors and Affiliations

  1. Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining & Technology, Xuzhou, 221116, China

    Hong Yan  (严红) & Peng-fei Xing  (邢鹏飞)

  2. Faculty of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Fu-lian He  (何富连)

  3. Guizhou Xinlian Blasting Engineering Group Co., Ltd., Guiyang, 550002, China

    Lin-yue Li  (李林玥)

  4. Department of Mining and Mineral Resources Engineering, Southern Illinois University, Carbondale, Illinois, 62901, USA

    Rui-min Feng  (冯锐敏)

Authors
  1. Hong Yan  (严红)
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  2. Fu-lian He  (何富连)
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  3. Lin-yue Li  (李林玥)
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  4. Rui-min Feng  (冯锐敏)
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  5. Peng-fei Xing  (邢鹏飞)
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Corresponding author

Correspondence to Hong Yan  (严红).

Additional information

Foundation item: Project(51404248) supported by the National Natural Science Foundation of the Youth Science Foundation of China; Project(2017XKQY012) supported by Fundamental Research Funds for the Central Universities of China; Project(2014M551702) supported by the China Postdoctoral Science Foundation; Project supported by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions, China

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Yan, H., He, Fl., Li, Ly. et al. Control mechanism of a cable truss system for stability of roadways within thick coal seams. J. Cent. South Univ. 24, 1098–1110 (2017). https://doi.org/10.1007/s11771-017-3513-x

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  • DOI: https://doi.org/10.1007/s11771-017-3513-x

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