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Rock Burst Monitoring by Integrated Microseismic and Electromagnetic Radiation Methods

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Abstract

For this study, microseismic (MS) and electromagnetic radiation (EMR) monitoring systems were installed in a coal mine to monitor rock bursts. The MS system monitors coal or rock mass ruptures in the whole mine, whereas the EMR equipment monitors the coal or rock stress in a small area. By analysing the MS energy, number of MS events, and EMR intensity with respect to rock bursts, it has been shown that the energy and number of MS events present a “quiet period” 1–3 days before the rock burst. The data also show that the EMR intensity reaches a peak before the rock burst and this EMR intensity peak generally corresponds to the MS “quiet period”. There is a positive correlation between stress and EMR intensity. Buckling failure of coal or rock depends on the rheological properties and occurs after the peak stress in the high-stress concentration areas in deep mines. The MS “quiet period” before the rock burst is caused by the heterogeneity of the coal and rock structures, the transfer of high stress into internal areas, locked patches, and self-organized criticality near the stress peak. This study increases our understanding of coal and rock instability in deep mines. Combining MS and EMR to monitor rock burst could improve prediction accuracy.

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Abbreviations

σ i :

Principal stress

ɛ i :

Principal strain

λ, G :

Lame constants

E :

Young’s modulus

v :

Poisson’s ratio

σ c :

Uniaxial compressive strength

m :

Distribution scale of the Weibull distribution

ɛ 0 :

Shape parameter of the Weibull distribution

ɛ :

Strain of the coal or rock micrograins

φ(ɛ):

Failure probability

N :

EMR pulses

N 0 :

Total EMR pulses

W 0 :

Energy per EMR pulse

W :

Total EMR pulses energy

W e :

EMR energy

E m :

EMR intensity

D :

Electric displacement

V :

Coal or rock volume

U :

Total potential energy

U E :

Strain energy

W L :

Potential energy

U s :

Dissipative energy

F 0 :

Initial force

k :

Dynamic stiffness

u 0 :

Displacement of the loading system

u :

Displacement of the coal or rock mass

f(u):

Constitutive curve of the coal or rock mass

\(f^{\prime } \left( u \right)\) :

Tangent slope of f(u) − u

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (51574231), Excellent Innovation Team of China University of Mining and Technology (2014ZY001), Fundamental Research Funds for the Central Universities (2015XKMS005), and A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). We thank anonymous reviewers for their comments and suggestions to improve the manuscript.

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Correspondence to Enyuan Wang.

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Li, X., Wang, E., Li, Z. et al. Rock Burst Monitoring by Integrated Microseismic and Electromagnetic Radiation Methods. Rock Mech Rock Eng 49, 4393–4406 (2016). https://doi.org/10.1007/s00603-016-1037-6

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  • DOI: https://doi.org/10.1007/s00603-016-1037-6

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