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以有机玻璃(PMMA)为试验材料,采用实验室模型试验的方法,结合LS-DYNA进行爆破数值模拟分析,研究了爆炸应力波与爆生气体对被爆介质的作用效应。结果表明,爆炸应力波的作用是粉碎区微裂纹形成的主要原因,爆生气体的作用是裂隙区裂纹形成的主要动力。爆炸作用下,弹性震动区介质的受力特征为先受压后受拉。此外,爆生气体的作用显著增加了爆破弹性震动区介质的应力、应变峰值和受力时间,说明爆生气体不仅具有准静态作用,还具有动态作用。同时指出,岩石爆破理论需要进一步修正和完善,严格考虑爆炸应力波和爆生气体实际作用过程的数值模拟算法亟待发展。
Taking PMMA as the experimental material, the numerical simulation of blasting with LS-DYNA was conducted by means of laboratory model test. The effect of explosive stress wave and explosive gas on the explosive medium was studied. The results show that the effect of explosion stress wave is the main reason for the formation of micro-cracks in the crushing zone. The effect of the gas explosion is the main driving force for the crack formation in the fracture zone. Under the action of the explosion, the force characteristics of the medium in the elastic vibration zone are tensioned first and then pulled. In addition, the effect of the unburden gas significantly increases the stress, strain peak and stress time of the medium in the blasting elastic vibration zone, which shows that the gas in the explosion gas not only has the quasi-static effect but also has the dynamic effect. At the same time, it is pointed out that the theory of rock blasting needs to be further revised and perfected, and the numerical simulation algorithm that strictly considers the actual process of explosion stress wave and gas explosion is in urgent need of development.