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Geomechanics and Engineering
  Volume 24, Number 3, February10 2021 , pages 205-213
DOI: https://doi.org/10.12989/gae.2021.24.3.205
 


Effects of water saturation time on energy dissipation and burst propensity of coal specimens
Xiaohan Yang, Ting Ren, Lihai Tan and Alex Remennikov

 
Abstract
    Water infusion has long been taken as an effective way to eliminate coal burst risk as coal properties can be loosen and soften by water infusion. However, not all industrial trials of water infusion for coal burst prevention have been necessarily effective in all situations as the effectiveness of this method can be affected by water infusion time, coal properties and the parameters of water injection. Hence, some fundamental issues including the effects of water infusion time on burst propensity and energy evolution need to be further discussed. In this paper, four groups of coal specimens with 0 day, 5 days, 10 days, and 15 days water saturation time are tested under uniaxial compression load with the application of AE monitoring. To comprehensively compare the burst behavior of coal specimens under different water saturation time, stress-strain curves, AE counts, fragmentation characteristics and burst propensity of these groups are analyzed. It was found by this research that sufficient water saturation can mitigate the burst behavior of coal samples while insufficient water infusion might cannot reach the burst mitigation aims.
 
Key Words
    coal burst; mining geomechanics; water saturation; burst propensity; acoustic emission; coal fragmentation
 
Address
Xiaohan Yang, Lihai Tan and Alex Remennikov: School of Civil, Mining and Environmental Engineering, University of Wollongong, NSW 2522, Australia

Ting Ren: 1.) School of Civil, Mining and Environmental Engineering, University of Wollongong, NSW 2522, Australia
2.) State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Jiangsu, 221116, PR China
 

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