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Analysis of Deformation, Permeability and Energy Evolution Characteristics of Coal Mass Around Borehole After Excavation

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Abstract

The mining of underground coal seam often induces the dynamic disasters of coal seam, such as rock burst and gas outburst. The determination of evolution characteristics of mechanical parameters and seepage parameters of coal mass after excavation is the basis for analyzing the formation mechanism of dynamic disasters. In this study, a coupled hydromechanical numerical approach is developed and their complex interactions are analyzed using the energy method to study the influence of outburst factors during underground excavation. A finite element model of porous media, which represents the gas flow field, the coal deformation field, the coal damage field and the cross-couplings between them, is established and the reliability of the model is ensured by numerical and experimental validation. Subsequently, during underground excavation, the coal deformation and gas flow properties around the borehole associated with different factors, including gas sorption, the matrix-fracture characteristics of coal and the seepage characteristics, are analyzed quantitatively using numerical simulations. Furthermore, an energy index is developed based on the energy method to analyze the comprehensive influence of in situ stress and gas pressure on coal mass. The results revealed that in the damage zone, coal permeability increases greatly by one to two orders of magnitude and the gas pressure remains low. Gas adsorption not only affects the stress and deformation of coal, but also affects the extent of the damage zone. High in situ stress, high gas pressure and low coal strength cause the failure range to increase.

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Acknowledgments

This study is sponsored by the National Natural Science Foundation of China (51679199 and 51979225), the Project Supported by Natural Science Basic Research Plan in Shaanxi Province of China (2019JQ-275), the Scientific Research Program Funded by Shaanxi Provincial Education Department (19JK0578), the Postdoctoral Research Projects of Shaanxi Province and the China Postdoctoral Science Foundation (2019T120929 and 2018M633549).

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Authors and Affiliations

  1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an, 710048, China

    Yi Xue, Faning Dang, Jia Liu & Songhe Wang

  2. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Yi Xue, Faning Dang, Jia Liu & Songhe Wang

  3. Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Building 60, Melbourne, VIC, 3800, Australia

    P. G. Ranjith

  4. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Tongqiang Xia & Yanan Gao

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  1. Yi Xue
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  4. Jia Liu
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Correspondence to Yi Xue or Jia Liu.

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Xue, Y., Ranjith, P.G., Dang, F. et al. Analysis of Deformation, Permeability and Energy Evolution Characteristics of Coal Mass Around Borehole After Excavation. Nat Resour Res 29, 3159–3177 (2020). https://doi.org/10.1007/s11053-020-09644-0

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  • DOI: https://doi.org/10.1007/s11053-020-09644-0

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