压剪破坏条件下型煤的声发射特征研究
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摘要
为了给煤炭开采活动中煤岩体和巷道压剪破坏的预报预测提供一定的依据,采用微机控制试验机进行了型煤试块的压剪破坏试验,研究了压剪破坏条件下的声发射特征及压剪应力状态的影响.试验结果表明:声发射伴随于整个型煤压剪破坏的始终,压密阶段之后,声发射事件随应力的增减而增减;当压应力等于剪应力时,声发射事件与试样应力曲线变化趋势最为接近;随着型煤试样剪切破坏强度的下降,声发射事件的峰值也呈现逐渐减小的趋势;低剪切角条件下声发射事件高于高剪切角条件下声发射事件.
The chief purpose of this paper aims at studying the AE (acoustic emission)characteristics and influence of compression-shear stress state under the condition of compression-shear failure in order to provide the certain evidence for the forecast of the coal and rock mass and the compression-shear failure in the roadways during the coal mining activity.The compression-shear experiments of the mould coal sample were done by using the microcomputer-controlled testing machine.The experiment results showed that AE characters accompany the whole process of compression-shear failure of mould coal.After the pressure consolidation,the AE events increase with the stress;When compressive stress equals to shear stress,AE events are closest to stress change curve of samples;With the decrease of compression-shear failure's intensity of mould coal samples,the AE events' peak value decreases gradually;Compared with higher shear angle,AE events are more at lower shear angle.
The chief purpose of this paper aims at studying the AE (acoustic emission)characteristics and influence of compression-shear stress state under the condition of compression-shear failure in order to provide the certain evidence for the forecast of the coal and rock mass and the compression-shear failure in the roadways during the coal mining activity.The compression-shear experiments of the mould coal sample were done by using the microcomputer-controlled testing machine.The experiment results showed that AE characters accompany the whole process of compression-shear failure of mould coal.After the pressure consolidation,the AE events increase with the stress;When compressive stress equals to shear stress,AE events are closest to stress change curve of samples;With the decrease of compression-shear failure's intensity of mould coal samples,the AE events' peak value decreases gradually;Compared with higher shear angle,AE events are more at lower shear angle.
引文
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[3]黄炳香.煤岩体水力致裂弱化的理论与应用研究[D].徐州:中国矿业大学,2009.Huang B X.Research on theory and application of hydraulic fracture weakening for coal-rock mass[D].Xuzhou:China University of Mining&Technology,2009.
[4]付小敏.典型岩石单轴压缩变形及声发射特性试验研究[J].成都理工大学学报(自然科学版),2005,32(1):17-21.Fu X M.Experimental study on uniaxial compression deformation and acoustic emission property of typical rocks[J].Journal of Chengdu University of Technology(Natural Science Edition),2005,32(1):17-21.
[5]张茹,谢和平,刘建锋,等.单轴多级加载岩石破坏声发射特性试验研究[J].2006,25(12):2584-2588.Zhang R,Xie H P,Liu J F,et al.Experimental study on acoustic emission characteristics of rock failure under uniaxial multilevel loadings[J].2006,25(12):2584-2588.
[6]纪洪广,蔡美峰.混凝土材料声发射与应力-应变参量耦合关系及应用[J].岩石力学与工程学报,2003,22(2):227-231.Ji H G,Cai MF Coupling constitutive relation between ae parameter and stress-strain and its application[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(2):227-231.
[7]许昭永,梅世蓉,庄灿涛,等.真三轴压机刚度对岩石破裂声发射的影响及与地震活动性的联系[J].地震学报,1991,13(2):223-232.Xu Z R,Mei S R,Zhunag C T,et al.The influence of stiffness of the true triaxial testing machine on the rupturing and acoustic emission of rocks and its correlation with seismic activities[J].Acta Seismologica Sinica,1991,13(2):223-232.
[8]吴刚,赵震洋.不同应力状态下岩石类材料破坏的声发射特性[J].岩土工程学报,1998,20(2):82-85.Wu G,Zhao Z Y.Acoustic emission character of rock materials failure during various stress states[J].Chinese Journal of Geotechnical Engineering,1998,20(2):82-85.
[9]宋富喜,马胜利.利用声发射震源机制解研究Ⅲ型剪切断层变形破坏特征[J].岩石力学与工程学报,2004,23(23):4084-4089.Song F X,Ma S L.Study on deformation and rupture features of model iii shear faults using focal mechanism solution of acoustic emission[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(23):4084-4089.
[10]徐涛,杨天鸿,唐春安,等.孔隙压力作用下煤岩破裂及声发射特性的数值模拟[J].岩土力学,2004,25(10):1560-1565.Xu T,Yang T H,Tang C A,et al.Numerical simulation of failure and induced acoustic emission characteristics of coal-rock under pore pressure[J].Rock and Soil Mechanics,2004,25(10):1560-1565.
[11]陆菜平,窦林名,谢耀社,等.煤样三轴围压钻孔损伤演化冲击试验模拟[J].煤炭学报,2004,29(6):659-662.Lu C P,Dou L M,Xie Y S,et al.Experimental simulation of drilling impact of coal sample in three-axle enclosed pressure[J].Journal of China Coal Society,2004,29(6):659-662.
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