循环载荷作用下煤样能量转化规律和声发射变化特征

doi:10.13722/j.cnki.jrme.2015.1549

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Abstract TAW–2000 kN triaxial experiment system and SH–II AE signal acquisition system were used to investigate the energy conversion and acoustic emission characteristics of coal under uniaxial cyclic loading. The coal sample c05 suddenly burst when failed. The curve of c06 had a plastic jump before destruction. The local buckling of c08 was accumulated into interferential damage and the curve fluctuated and dropped suddenly when the sample failed. The instability precursor was analysed through the perspectives of energy conversion. Elastic energy reaching the peak value and the elastic energy index reaching the maximum through accelerated growth of the dissipated energy was the first judgment. In the second judgement，the elastic energy is constant，and the plasticity is increased. With the increase of cyclic loading，the dissipated energy presented an overall upward trend. The vibration resistance of coal samples evaluated according to the damping ratio was in the order of c06＞c08＞c05，which was consistent with the uniaxial compressive strength. The radial elastic energy and the volumetric elastic energy both showed a trend of decrease and the radial plastic energy and the volumetric plastic energy both tended to rise，which may be taken as the instability criterion. The peak count of acoustic emission in the loading stage presented a trapezoidal shape，and the peak count in the unloading stage showed a decreasing trend. The Kaiser effect of the cyclic loading is obvious，while the felicity effect in the later stage of cyclic loading is obvious. The variation of characteristic parameters of AE in the loading and unloading stage indicated that the plastic properties can be showed with the AE count in the loading stage and the energy and dissipation energy can be characterized with the AE count in the unloading stage. The accumulative count of AE and the plastic properties showed consistent regularity，the dissipation energy and AE energy showed consistent regularity. The sudden increase of AE energy and the sudden reduction of AE amplitude can be used to predict the breaking of coal and rock.

Key words： mining engineering cyclic loading energy conversion acoustic emission(AE) dissipated energy damping ratio

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	Articles by authors
	XIAO Fukun
	LIU Gang
	SEHN Zhiliang
	ZHANG Fengrui
	WANG Yifei

Cite this article:

XIAO Fukun,LIU Gang,SEHN Zhiliang, et al. Energy conversion and acoustic emission(AE) characteristics of coal samples under cyclic loading[J]. , 2016, 35(10): 1954-1964.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1549 OR http://www.rockmech.org/EN/Y2016/V35/I10/1954

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