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Research on reasonable coal pillar width of roadway driven along goaf in deep mine

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Abstract

Driving roadway along a goaf is commonly adopted for mining face of thick seam in a deep mine. Determining a reasonable width of coal pillar is a key scientific problem for driving roadway along a goaf in a deep mine. The paper took a roadway driven along a goaf at Zhaolou coal mine which is a typical kilometer-deep mine in China as engineering background. Field monitoring, model test, and numerical experiment are conducted. Stress and displacement evolution mechanism are analyzed with different pillar widths. The test results show that with the increase of coal pillar width, the peak stress value at the coal pillar working slope and integrated coal beside the roadway increases firstly and then tends to be stable, its position is transferred to the side of the roadway, and the deformation of coal pillar decreases gradually during roadway excavation. The coal pillar deformation and roadway vertical displacement increased as the coal pillar width increases under high abutment pressure. In order to reduce the waste of non-renewable resources and meet the requirements of bearing capacity and stability of coal pillars, a method is proposed for setting a reasonable width of coal pillars and the specific width of coal pillars is designed and applied in engineering practices based on the above research. All the tests are significant in the study of driving roadway along a goaf in a deep mine.

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Acknowledgments

The authors of this article are so grateful to the reviewers for their valuable comments and modification suggestions on the improvement of this paper.

Funding

This work was supported by the Natural Science Foundation of China [grant numbers 51674154, 51704125], the China Postdoctoral Science Foundation [grant numbers 2016M590150, 2016M602144, 2017T100116, 2017T100491], Open Fund for State Key Laboratory for Geo-mechanics and Deep Underground Engineering, China University of Mining & Technology [grant numbers SKLGDUEK1519, SKLGDUEK1717], the National Key Research and Development Program [grant number 2016YFC0600901], and Natural Science Foundation of Shandong Province, China [grant numbers 2017GGC30101, ZR2017QEE013].

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Correspondence to Bei Jiang.

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Wang, Q., Gao, H., Jiang, B. et al. Research on reasonable coal pillar width of roadway driven along goaf in deep mine. Arab J Geosci 10, 466 (2017). https://doi.org/10.1007/s12517-017-3252-1

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  • DOI: https://doi.org/10.1007/s12517-017-3252-1

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