预裂爆破成缝机理的数值模拟研究及其应用  

Numerical Simulation Research on Mechanism of Cracks Formation Induced by Pre-splitting Blasting and Its Application

作　　者：安远英[1] AN Yuanying(School of Information Engineering, Tongren Polytechnic College, Tongren 554300, Chin)

机构地区：[1]铜仁职业技术学院信息工程学院,贵州铜仁554300

出　　处：《煤矿安全》2018年第5期178-182,共5页Safety in Coal Mines

摘　　要：为了验证数值模拟技术在预裂爆破中的实用性,根据云南省布沼坝露天煤矿西帮边坡治理实例,通过ANSYS/LS-DYNA软件对不同爆破参数条件下的预裂缝过程进行模拟,并对预裂缝的爆破效果进行了计算分析,得到几组爆破效果较好的线装药密度、孔间距、炮孔直径参数。将这几组预裂爆破参数分别应用于现场试验中,从坡面半孔率、坡面平整度、孔口位置岩体破碎状况、有无根底、孔壁岩石上有无爆生裂纹、有无超挖现象以及对保留岩体的减震效果几个方面对预裂爆破效果进行评价,得到1组最优参数。实践证明:采用数值模拟与爆破试验相结合的方法对爆破参数进行优化,爆破成缝效果明显。In order to validate the practicability of numerical simulation technology in pre-splitting blasting engineering, the western slope of Buzhaoba Mine in Yunnan Province is taken as an example. The pre-cracks of pre-splitting blasting are simulated through ANSYS/LS-DYNA software under the condition of different blasting parameters. In this paper, the blasting effect of pre-cracks is calculated and analyzed, and the density of wire charge, hole spacing and hole diameter parameters are obtained.The groups of pre-splitting blasting parameters used in the field test, respectively from the slope and porosity, slope surface roughness, hole position of rock breakage status, with or without roots, wall rock for the blasting crack, presence of over excavation and shock absorption effect of reserved rock mass, to evaluate several aspects of pre-splitting blasting effect, and get a set of optimal parameters. It is proved by practice that the blasting parameters are optimized by numerical simulation and blasting test and the blasting results are obvious.

关 键 词：预裂爆破 数值模拟 LS-DYNA 爆破参数 预裂缝 

分 类 号：TD235.371[矿业工程—矿井建设]