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Simulation Experiment and Acoustic Emission Study on Coal and Gas Outburst

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Abstract

A coal and gas outburst is an extreme hazard in underground mining. The present paper conducts a laboratory simulation of a coal and gas outburst combined with acoustic emission analysis. The experiment uses a three-dimensional stress loading system and a PCI-2 acoustic emission monitoring system. Furthermore, the development of a coal and gas outburst is numerically studied. The results demonstrate that the deformation and failure of a coal sample containing methane under three-dimensional stress involves four stages: initial compression, elastic deformation, plastic deformation and failure. The development of internal microscale fractures within a coal sample containing methane is reflected by the distribution of acoustic emission events. We observed that the deformation and failure zone for a coal sample under three-dimensional stress has an ellipsoid shape. Primary acoustic emission events are generated at the weak structural surface that compresses with ease due to the external ellipsoid-shaped stress. The number of events gradually increases until an outburst occurs. A mathematical model of the internal gas pressure and bulk stress is established through an analysis of the internal gas pressure and bulk stress of a coal sample, and it is useful for reproducing experimental results. The occurrence of a coal and gas outburst depends not only on the in situ stress, gas pressure and physical and mechanical characteristics of the coal mass but also on the free weak surface of the outburst outlet of the coal mass. It is more difficult for an outburst to occur from a stronger free surface.

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Abbreviations

Θ:

Bulk stress

σ 2 :

Confining stress

η :

Instantaneous desorption rate

t :

Time

n :

Time effect divergence speed

B :

Constant parameter

σ Q :

Coal mass strength of a free gas surface

q :

Gas permeability

σ h :

Horizontal stress

σ 1 :

Axial stress

σ 3 :

Confining stress

η max :

Final desorption rate

t 0 :

Median desorption time parameter

a :

Constant parameter

p :

Gas pressure

p 0 :

Atmospheric pressure

σ v :

Vertical stress

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Acknowledgements

This study work is supported by the National Natural Science Foundation of China (21373416, 51304142), the Natural Science Project of Shanxi Province in China (2013021029-3).

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Authors and Affiliations

  1. College of Mining Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, China

    Hui Li, Dong Zhao & Dong Duan

  2. Institute of Mining Technology, Taiyuan University of Technology, Taiyuan, Shanxi, China

    Hui Li & Zengchao Feng

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  1. Hui Li
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  2. Zengchao Feng
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Correspondence to Hui Li.

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Li, H., Feng, Z., Zhao, D. et al. Simulation Experiment and Acoustic Emission Study on Coal and Gas Outburst. Rock Mech Rock Eng 50, 2193–2205 (2017). https://doi.org/10.1007/s00603-017-1221-3

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  • DOI: https://doi.org/10.1007/s00603-017-1221-3

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