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Failure mechanism and control of deep gob-side entry

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Abstract

Gob-side entry (GSE) is defined as caving that is developed along the gob with a yield pillar. Compared to other entry layouts, GSE has many advantages, such as the advantageous stress environment, high recovery rate, and prevention of coal bumps. Recently, many Chinese coal mines have reached deep mining depths. As a result of the high stress in deep mining conditions, severe bulk and dilatant deformation has occurred in deep GSE (DGSE). The direct problems in this situation, such as interruptions to production, increasing rehabilitation cost, and high labor consumption, affect the safety and mining efficiency of deep coal seams. In this paper, based on analysis of the deformation characteristics of a typical DGSE, numerical modeling was used to study the causes and mechanism of DGSE failure. In addition, a series of strategies are proposed for DGSE deformation control. The case study presented indicates that the proposed control strategies can prevent severe deformation of the DGSE. Thus, the results of this research can be used as a reference for DGSE control in other deep mining settings.

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Acknowledgments

This research was financially supported by the National Natural Science Foundation of China through grant no. 51174195 and no. 51204166, Chinese National Programs for Fundamental Research and Development (973 Program) through grant no. 2013CB227905, and Graduate Student Research Innovation Project of the Ordinary University in Jiangsu Province (2013) through grant no. CXLX13_952. All support is greatly appreciated.

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Authors and Affiliations

  1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

    Meng Wang

  2. School of Mines, China University of Mining and Technology, Xuzhou, 221116, China

    Meng Wang, Wenfeng Li, Xiangyu Wang & Shenggen Cao

  3. State Key Laboratory of Coal Resource and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China

    Jianbiao Bai & Shenggen Cao

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  1. Meng Wang
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  2. Jianbiao Bai
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  3. Wenfeng Li
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  4. Xiangyu Wang
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  5. Shenggen Cao
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Correspondence to Jianbiao Bai.

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Wang, M., Bai, J., Li, W. et al. Failure mechanism and control of deep gob-side entry. Arab J Geosci 8, 9117–9131 (2015). https://doi.org/10.1007/s12517-015-1904-6

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  • DOI: https://doi.org/10.1007/s12517-015-1904-6

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