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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.
In order to provide a certain basis for predicting and predicting the pressure-shear failure of coal rock mass and roadway in coal mining activities, the pressure-shear failure test of briquette sample was carried out by computer controlled testing machine. The acoustic emission characteristics under pressure-shear failure And the impact of the compressive shear stress state.The results show that the acoustic emission along with the briquette shear failure of the briquette, the acoustic emission events increase and decrease with the increase or decrease of the stress after the compaction stage.When the compressive stress is equal to the shear stress, The acoustic emission event and the stress curve of the sample have the closest change trend. With the decrease of the shearing strength of the briquette sample, the peak value of acoustic emission also shows a decreasing trend. The acoustic emission event under low shear angle is higher than Acoustic Emission Events at High Shear Angle.