【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.更多还原

【Abstract】 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.更多还原