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Coal pillar safety and surface deformation characteristics of wide strip pillar mining in deep mine

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Abstract

The wide strip pillar mining of Tangkou coal mine in Eastern China is the engineering background in the paper. Coal pillar safety and surface deformation characteristics of wide strip pillar mining in deep mine are studied by using in situ measurement, three-dimensional similar material simulation test, and theoretical analysis. Results show that in deep mine, the plastic zone’s width of coal pillar becomes larger obviously and the vertical stress of coal pillar presents a saddle-shaped distribution. The lateral deformation of coal pillar mainly concentrates on the area 9.5 m from the edge of coal pillar, which is discontinuous, stepped, and mutational. In addition, if only one working face with strip pillar mining is mined, the influence extent caused by coal mining is weaker and the surface subsidence and curvature are smaller. If multiple working faces with strip pillar mining are mined, the surface subsidence is obvious, the subsidence factor is 0.22, the subsidence basin is larger but gentler and uniform, and the surface deformation is continuous and long term. On the basis of the characteristics of wide strip pillar mining in deep mine, the safety of wide coal pillar in deep mine is checked.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (grant no. U1361105, 51274132, and 51474134), the Program for New Century Excellent Talents (NCET-13-0880), and Shandong Provincial Natural Science Foundation (ZR2013EEZ001). We are also grateful to the editors and reviewers for their useful comments and suggestions.

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Authors and Affiliations

  1. State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China

    Weijia Guo, Hailong Wang & Shaojie Chen

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  1. Weijia Guo
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  2. Hailong Wang
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  3. Shaojie Chen
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Correspondence to Hailong Wang.

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Guo, W., Wang, H. & Chen, S. Coal pillar safety and surface deformation characteristics of wide strip pillar mining in deep mine. Arab J Geosci 9, 137 (2016). https://doi.org/10.1007/s12517-015-2233-5

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  • DOI: https://doi.org/10.1007/s12517-015-2233-5

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