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- W2364600257 abstract "Acoustic emission characteristics of coal samples in two sizes from the No.3 coal seam in Lu'an Group Zhangcun Coal Mine under uniaxial compression were studied by the servo-controlled testing machine RMT-150B.The sizes of standard and large block coal samples are Φ50 mm×100 mm and 155 mm×155 mm×125 mm,respectively.Both samples contain different original bedding planes and fissures,and exhibit different deformation,strength and acoustic emission when subject to uniaxial compression.The experimental results show that deformation and strength in large block coal sample are obviously lower than that of the standard samples,and the decreases in amplitude of uniaxial compression strength,modulus of elasticity and modulus of deformation are 19.7%,35.7% and 55.4%,respectively.There are different acoustic emissions corresponding to the four stages of the uniaxial compression process for the two coal samples.These acoustic emissions can be divided into four stages in the following order quiet,transition,active and decay stages.The active stage can be used as a predictor for coal breakage.The strength and quantity of acoustic emissions in large block coals are obviously higher than those in the standard samples.The maximum and accumulative energies in large block coals are enhanced by 16.6 and 6.4 times,respectively.The maximum count of sample failure and the cumulated count are enhanced by 11.1 and 8.1 times;the peak number of sample failure and the cumulated count are enhanced by 7.4 and 6.6 times,respectively.It is conservative to predict coal and gas outburst,rock burst and other dynamic disasters of coal and rock using acoustic emission data of standard coal samples;it is better to use the ones of large block coal samples." @default.
- W2364600257 created "2016-06-24" @default.
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- W2364600257 date "2013-01-01" @default.
- W2364600257 modified "2023-09-23" @default.
- W2364600257 title "Research on acoustic emission characteristics of Zhangcun coal samples in two sizes subject to uniaxial compression" @default.
- W2364600257 hasPublicationYear "2013" @default.
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