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Numerical simulation on tendency mining fracture evolution characteristics of overlying strata and coal seams above working face with large inclination angle and mining depth

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Abstract

In order to master the tendency mining-fracture-evolution characteristics of overlying strata and coal seams above working face with large inclination angle and mining depth in mining process, the 1221 working face in Zhao mine is selected as the engineering background and a mathematical model is established. The displacement variation, stress and strain of overlying strata and coal seams are simulated by using ANSYS software. In the mining process, the movement characteristics, displacement variation laws and fracture evolution characteristics of overlying strata and coal seams above working face with large inclination angle and mining depth along inclination direction are discussed. Simulation results show that with the advance of working face, the fracture development of overlying strata and coal seams is larger and larger; the area of gob is gradually expanding and the transverse stress of overlying strata and coal seams is also expanding. Stress contour of overlying strata and coal seams at both ends of gob becomes denser and denser; the activity of the overlying strata and coal seams near the up-roadway side of the gob is violent. The pressure relief zone is formed in the upper part of the strata and the roof above the gob. Large inclination angle of coal seam results in larger supporting pressure in the underside of the gob and smaller supporting pressure in the upper side of the gob. Along the inclination direction of the working face, the pressure relief zone is mainly concentrated in the outlet roadway of the working face; the fracture development and strata separation are obvious, which offer good passage for gas flow and migration.

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Acknowledgements

This work is supported by the National Natural Science Foundation Project of China (51004048, 51374003, 51434006) and Hunan Provincial Natural Science Foundation Project (2016JJ6038, E51523). Those supports are greatly acknowledged with thanks.

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Authors and Affiliations

  1. School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

    Qing Ye, Wei-jun Wang & Zhen-zhen Jia

  2. School of Chemical Engineering, the University of Queensland, Brisbane, QLD, 4072, Australia

    Qing Ye & Geoff Wang

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  1. Qing Ye
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  2. Wei-jun Wang
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  3. Geoff Wang
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  4. Zhen-zhen Jia
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Correspondence to Qing Ye.

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Ye, Q., Wang, Wj., Wang, G. et al. Numerical simulation on tendency mining fracture evolution characteristics of overlying strata and coal seams above working face with large inclination angle and mining depth. Arab J Geosci 10, 82 (2017). https://doi.org/10.1007/s12517-017-2856-9

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  • DOI: https://doi.org/10.1007/s12517-017-2856-9

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