径向不耦合装药爆破下页岩的动态应变分布及损伤分形特征Dynamic Strain Distribution and Damage Fractal Characteristics of Shale under Radial Uncoupled Charge Blasting
杨国梁,邹泽华,张赫,李峰
摘要(Abstract)：
为研究径向不耦合装药结构对炸药能量的传递和爆破效果的影响，提高炸药能量利用率，增强岩体破碎效果，通过将直径为50 mm,高度为100 mm的标准页岩试件钻孔后装填二硝基重氮酚，控制45 mg的小药量，同时设置1、1.5、2、2.5四种径向不耦合装药系数，进行爆破模型实验。通过超动态应变测试系统、互补集合经验模态分解方法处理试件轴向各测点应变波形，分析试件不同段应变规律，并基于计盒维数理论，计算比较应变变化以及各测点处截面的损伤分形维数，对比试件不同区段裂纹开展情况，结合应变曲线对四种径向不耦合系数爆炸能量传播规律进行分析。结果表明：通过对比应变曲线，总体上拉应变峰值大于压应变峰值，试件受到较大且反复的拉、压应力后，最终发生破坏。实验表明径向不耦合系数为1.5时显著提高炸药能量利用，能延长爆生气体作用时间。不耦合装药结构试件截面的损伤分形维数从上至下呈n型变化，当系数为1.5时试件各段损伤分布最均匀，裂隙区能充分扩展，爆破效果最好。
关键词(KeyWords)： 不耦合装药结构;爆炸应力波;动态应变;爆破损伤;分形维数
基金项目(Foundation): 国家自然科学基金（51934001）~~
作者(Author): 杨国梁,邹泽华,张赫,李峰
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