摘要
针对单孔定向断裂爆破初期岩体的破坏过程进行了数值模拟研究。主要研究了聚能管装药结构下炸药起爆后爆轰波在聚能管中的传播过程,以及不同耦合系数、不同管壁厚度对岩体初期破坏的影响。结果表明:采用不耦合系数为1.67,管壁厚度为1 mm时,可以取得较好的聚能效果,不耦合系数过小,以及管壁过薄均不利于能量的汇聚;同时解释了大量的小比例模型实验中岩体多向劈裂现象产生的原因,聚能管作用岩壁过程中的X形应力集中分布以及过小的模型带来的单元尺寸效应,是导致小比例模型实验中岩体多向劈裂破坏的直接原因。
Numerlcal simulations of directional fraction blasting were carried out. Propagation processes of detonation wave in binding energy tube were simulated. The effects of non - coupling coefficient and tube thickness on the initial damage of rock were studied. The conclusions can be drawn as follows. Adopting non -coupling coefficient 1.67 and tube thickness lmm, the binding energy effect was significant. The small non - coupling coefficient and thickness had adverse influence. The reason of polydirectional splitting damage in scale model test was explained. Stress concentration like X＇character and size effect of small models were the main reasons for the splitring damage.
出处
《煤矿安全》
CAS
北大核心
2009年第7期14-16,19,共4页
Safety in Coal Mines
基金
国家863资助项目(2007AA06Z131)
关键词
数值模拟
定向断裂爆破
聚能管
不耦合系数
numerical simulation
directional fraction blasting
binding energy tube
non- coupling coefficient
