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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摘要利用TAW–2000 kN三轴试验系统和SH–II声发射系统，对循环载荷下煤样能量转化规律和声发射特征开展研究。试验结果表明：通过煤样破坏形态和循环曲线规律，c05破坏瞬时突然崩裂，c06曲线破坏前出现明显塑性跳跃，c08局部失稳累计成扰动破坏，破坏时曲线不断波动。从能量转化角度分析失稳前兆，一次初判通过耗散能加速增长，弹性能达到峰值及弹性能量指数达到极大值，二次终判通过弹性能不变，塑性能增加。随着循环载荷的增加，耗散能整体呈现上升趋势。通过阻尼比评价煤样抗震性顺序为c06＞c08＞c05，结论与单轴抗压强度一致。以径向弹性能和体弹性能均呈现降低趋势和径向塑性能和体塑性能均呈现升高趋势作为失稳判据有一定参考。加载阶段声发射计数峰值呈现倒“梯形”，卸载阶段声发射计数峰值呈现递减趋势。循环载荷加载前期Kaiser效应明显，后期Felicity效应明显。通过加载阶段和卸载阶段声发射特征参数变化规律可知，塑性能可以利用加载阶段声发射计数和能量表征，耗散能可以利用卸载阶段声发射计数表征；通过循环加卸载声发射特征参数变化规律，声发射累计计数与塑性能呈现一致规律，耗散能和声发射能量规律性一致。通过声发射能量突升和声发射幅值的突降来预判煤岩的失稳。

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	肖福坤
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	王一斐

关键词 ：采矿工程, 循环载荷, 能量转化, 声发射, 耗散能, 阻尼比

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

引用本文:

肖福坤，刘刚，申志亮，张峰瑞，王一斐. 循环载荷作用下煤样能量转化规律和声发射变化特征[J]. 岩石力学与工程学报, 2016, 35(10): 1954-1964.
XIAO Fukun，LIU Gang，SEHN Zhiliang，ZHANG Fengrui，WANG Yifei. Energy conversion and acoustic emission(AE) characteristics of coal samples under cyclic loading. , 2016, 35(10): 1954-1964.

链接本文:

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

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