扇形孔爆破裂隙的数值模拟  

Numerical simulation of fan-hole blasting-induced rock fracture

作　　者：李斌[1,2] 许梦国[1,2] 王文杰[1,2] 

机构地区：[1]武汉科技大学,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081

出　　处：《中国矿业》2014年第2期84-91,共8页China Mining Magazine

基　　金：国家自然科学基金项目资助(编号:50804036);湖北省教育厅重点项目资助(编号:D20111107);武汉市晨光计划项目资助(编号:201050231045)

摘　　要：对扇形孔爆破裂隙产生机理的认识可以为改进爆破方案提供科学依据。利用程潮铁矿中深孔落矿参数及岩石的基本力学参数,通过AUTODYN软件,应用Johnson-Holmquist(J-H)材料模型,来模拟岩石爆破产生的裂隙。通过在炮孔之间的孔底、中间和孔口位置添加高斯点来记录爆破过程中最大爆破应力变化。通过模拟结果分析,炮孔越是密集的地方爆破应力越大,爆破裂隙也越多;相邻炮孔间隔时间起爆可以大幅度提升孔底岩石的最大爆破应力;相邻炮孔间距较小时,间隔时间起爆的作用就不明显了,岩石受到的最大爆破应力主要受距离近的炮孔爆破应力波的影响。It can provide scientific basis for improving blasting scheme by understanding fan-hole blasting-induced rock fracture production mechanism. It is available to simulate blasting-induced rock fracture by using the parameters of Chenchao Iron Mine, AUTODYN software and Johnson-Holmquist（J- H） model. It can record the max burst pressure by adding gauge points at bottom, middle and orifice of boreholes. The simulation result shows that denser the boreholes are, the higher pressure is and the more fracture is. The result also shows that delay detonators could dynamic increase max burst pressure of bottom rock, and the effect of delay detonators become less evident when the borehole spacing getting small, because the max burst pressure is mainly effect by the blasting stress wave of the borehole nearby.

关 键 词：扇形孔 AUTODYN Johnson—Holmquist模型 裂隙 最大爆破应力 

分 类 号：TD235[矿业工程—矿井建设]