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利用自主研发的真三轴岩爆试验系统,以中粗晶粒花岗岩为岩石试样,在实现低频周期扰动荷载与静载联合作用下岩爆过程模拟的前提下,研究不同荷载影响因素对岩爆的影响。研究结果表明:在其他荷载参数固定的条件下,在轴向低频周期动力扰动荷载作用下,轴向静应力、第三主应力和扰动荷载幅值均存在岩爆方面的门槛值,当达到或超过门槛值时,试样发生岩爆的可能性急剧增大,此时这3个影响因素的小幅变化可导致岩爆弹射动能与岩爆碎块破碎程度的显著变化;在其他荷载参数固定的条件下,在0~3 Hz频率范围内,随着扰动荷载频率的增加,岩爆弹射动能呈先增大后减小的变化规律;静载作用下试样积聚足够大的弹性能和扰动荷载持续输入足够大小和合适速率的能量是此类岩爆发生的能量条件;试样弹性应变能小幅度突增且弹性应变能极限存储能力快速下降的“双向背离效应”是此类岩爆发生的能量机制。
Using the self-developed true triaxial rock burst test system, using medium-coarse grained granite as a rock sample, under the premise of rockburst simulation under low-frequency cyclic perturbation and static loading, the effect of different loading factors on rock Impact of the explosion. The results show that under the condition of other fixed load parameters, the axial static stress, the third principal stress and the disturbance load amplitude all have the rockburst threshold value under the axial low-frequency cyclic dynamic disturbance load. When the When the threshold is exceeded, the possibility of rockburst increases sharply. At this time, slight changes of the three influencing factors can lead to significant changes in the rock ejection kinetic energy and the crushing degree of the rock burst. In other fixed load parameters Under the condition of 0 ~ 3 Hz, with the increase of disturbing load frequency, the kinetic energy of rock ejection increases first and then decreases; Under the static load, the sample accumulates enough elastic energy and disturbance load Continued input of sufficient magnitude and rate of energy is the energy conditions for such rockbursts; the elastic strain of the specimen increases slightly and the ultimate storage capacity of the elastic strain energy decreases rapidly. The “two-way divergence effect” The energy mechanism that occurs.