爆炸应力波与爆生气体对被爆介质作用效应研究

Action-effect study of medium under loading of explosion stress wave and explosion gas

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。

Using laboratory model test method with the material of PMMA,combining numerical simulation of LS-DYNA,action-effect on medium under loading of explosion stress wave and explosion gas was studied. The result showed that effect of explosion stress wave mainly led to formation of microcracks in the smash area,effect of explosion gas was the major impetus of crack formation in the crack area.Mechanics characteristic of medium in the elastic vibration area was compressive firstly and tensile secondly. The function of explosion gas dramatically increased peak values of stress（strain） and loading time of medium in the elastic vibration area,it proved that explosion gas had dynamic effect in addition to quasi-static effect. It indicated that the theory of rock blasting need further improvement and amendment,algorithm of numerical simulation which took the actual process of explosion stress wave and explosion gas into account need to be developed urgently.