不同耦合系数条件下岩石损伤特性的研究

发布时间：2018-06-13 20:54

本文选题：冲击波压力峰值 + 不耦合系数　；参考：《中国矿业》2017年10期

【摘要】：在预裂爆破中,采用合理的空气比和不耦合系数能有效控制爆炸荷载对岩体的破坏。利用Autodyn有限元动力分析软件,研究预裂爆破中空气间隔不耦合装药产生的爆炸荷载对岩石的损伤特性和孔壁冲击波峰值的变化规律。通过改变装药空气比,分析空气间隔装药产生的爆炸冲击波沿孔壁的压力分布,以及间隔装药时不耦合系数对孔壁冲击波峰值和应力波传播的影响。结果表明:连续装药条件下,爆破近区的压力峰值高于岩石动态抗压强度,离炮孔越远应力波衰减的越慢;在空气间隔装药条件下,岩石的损伤深度随空气比的增大而减小,孔内空气柱周围的岩石破坏不明显;在间隔不耦合装药时,不耦合系数越大,冲击荷载的强度越低,孔壁的损伤半径也越小。
[Abstract]:In pre-splitting blasting, the failure of rock mass caused by explosion load can be effectively controlled by using reasonable air ratio and uncoupling coefficient. Autodyn finite element dynamic analysis software is used to study the damage characteristics of rock caused by the explosion load caused by air-spaced uncoupled charge during pre-splitting blasting and the variation law of the peak value of the shock wave in the hole wall. By changing the ratio of charge to air, the pressure distribution of blast wave produced by air spacer charge along the hole wall and the influence of the uncoupling coefficient on the peak value of shock wave and the propagation of stress wave are analyzed. The results show that under the condition of continuous charge, the peak pressure near the blasting area is higher than the dynamic compressive strength of rock, and the attenuation of stress wave is slower than that of the blasting hole, and the damage depth of rock decreases with the increase of air ratio under the condition of air spacer charge. The rock failure around the air column in the hole is not obvious, and the larger the uncoupling coefficient is, the lower the impact load is, and the smaller the damage radius of the hole wall is.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【分类号】：TD235.1

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