An Experimental Investigation into the Strainburst Process Under Quasi-static Loading

Rockbursts cause damage to underground excavations in a sudden and violent manner and are associated with mining-induced seismic events. We propose a simple experimental method to study strainburst process in the laboratory, that simply involves a common compression testing apparatus and rock-coal-r...

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Bibliographic Details
Published in:Rock mechanics and rock engineering 2020-12, Vol.53 (12), p.5617-5629
Main Authors: Gao, Fuqiang, Kang, Hongpu, Yang, Lei
Format: Article
Language:English
Subjects:
Acoustic emission
Civil Engineering
Coal
Compression
Compression tests
Compressive properties
Cracking (fracturing)
Earth and Environmental Science
Earth Sciences
Earthquake damage
Earthquakes
Ejection
Energy
Experimental methods
Failure mechanisms
Geophysics/Geodesy
High speed cameras
Original Paper
Pollution monitoring
Rockbursts
Rocks
Sediment samples
Seismic activity
Strain
Test equipment
Vertical loads
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Summary:Rockbursts cause damage to underground excavations in a sudden and violent manner and are associated with mining-induced seismic events. We propose a simple experimental method to study strainburst process in the laboratory, that simply involves a common compression testing apparatus and rock-coal-rock specimens. Strainbursts of coal samples are successfully produced and the burst process is monitored using high-speed camera and acoustic emission sensors. The strainburst mechanism is characterized by an initial ejection of small coal fragments followed by the ejection of large coal blocks. We found that the strainbursts are caused by the elastic strain energy stored in the rock samples during the uniaxial compression. The amount of the transferred energy is significantly less than the elastic energy stored in the coal sample but plays an important role in triggering strainbursts. The greater the transferred energy, the greater the damage severity of strainbursts occurred in the coal sample. Tensile cracking subparallel to the vertical loading direction and tangential compressive stress appears to play a dominant role in the strainburst failure mechanism.
ISSN:0723-2632
1434-453X
DOI:10.1007/s00603-020-02231-y