高台阶抛掷爆破速度规律的数值模拟  

Numerical simulation on pin-point blasting of sloping surface

作　　者：黄永辉[1] 刘殿书[2] 李胜林[2] 李祥龙[3] 王家磊[2] 

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]昆明理工大学国土资源工程学院,云南昆明650093

出　　处：《爆炸与冲击》2014年第4期495-500,共6页Explosion and Shock Waves

基　　金：国家自然科学基金项目(51304087);云南省级人培项目(KKSY201404056;KKSA201121083)~~

摘　　要：为了获得高台阶抛掷爆破作用下岩石的抛掷速度变化规律,结合现场实验,采用理论分析、高速摄影技术、数值计算方法开展研究.研究结果表明,炮孔内炸药起爆后,坡面岩石抛掷初速度达到最大值的时间在93～105 ms之间,最大抛掷初速度在18～28 m/s之间;坡面岩石的最大抛掷初速度在延炮孔内传爆方向呈增长、稳定、下降的趋势;岩石抛掷运动过程的最后阶段呈自由落体运动,个别岩块的运动速度存在增减现象,主要是由于岩体破碎后岩块间存在的相互碰撞作用;高速摄影实验结果验证了数值计算结果的正确性、RHT材料本构模型及参数在高台阶抛掷爆破数值计算过程中的可用性。In order to obtain the casting speed of rock in pin-point blasting of sloping surface,a research was carried out by the field test,theoretical analysis,the high-speed photography and numerical simulation.The results of research show that maximum casting speed of rock was in the range of 18-28 m/s which was reached in 93-105 ms after detonation; along the direction of detonation propagating,maximum casting speed of rock increased to a platform firstly,then declined with the same motion resistance; in the end of pin-point blasting,the rock fall as free-faller,and the casting speed of rock vibrated due to the collision of rock; the process of pin-point blasting of sloping surface was simulated with the RHT constitutive model and parameters assorted.The result of numerical simulation was proved by the measurement of high-speed photography

关 键 词：爆炸力学 速度场 RHT材料本构模型 高台阶抛掷爆破 高速摄影 

分 类 号：O389[理学—流体力学] TU313[理学—力学]