预裂缝长度对爆破效果的影响
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摘要
为了研究预裂缝长度对爆破效果的影响,运用大型动力显式软件LS-DYNA对长度分别为5 m和7 m的预裂缝与贯通裂隙对爆破效果的影响进行了模拟,从峰值振速衰减的角度结合数值模拟结果得出结论:针对3种工况,预裂缝越长,减震效果越好,预裂缝对峰值振速存在的屏蔽区也受预裂缝长度的影响.结论对预裂爆破的研究及爆破参数的设置有一定的借鉴作用.
In order to study the effect of pre-splitting crack length on the blasting,numerical simulation is carried out on the presplitting crack of length of 5 meters,17 meters and penetrative cranny using the explicit nonlinear dynamic analysis finite element program LS-DYNA,through the attenuation law of peak vibration of the three kinds of working conditions and numerical simulation results,it is obtained that the longer the pre-splitting crack is,the better the shock absorption effect will be.The shielding area of the pre-splitting crack is affected by the length of pre-splitting crack.The conclusions of this paper have some reference to study pre-splitting blasting and the setting of the blasting parameters.
In order to study the effect of pre-splitting crack length on the blasting,numerical simulation is carried out on the presplitting crack of length of 5 meters,17 meters and penetrative cranny using the explicit nonlinear dynamic analysis finite element program LS-DYNA,through the attenuation law of peak vibration of the three kinds of working conditions and numerical simulation results,it is obtained that the longer the pre-splitting crack is,the better the shock absorption effect will be.The shielding area of the pre-splitting crack is affected by the length of pre-splitting crack.The conclusions of this paper have some reference to study pre-splitting blasting and the setting of the blasting parameters.
引文
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[2]许名标,彭德红.边坡预裂爆破参数优化研究[J].爆炸与冲击,2008(7):355-359.
[3]汪涛,陈诚,徐海波,等.预裂爆破在预留岩体开槽爆破中的应用[J].矿业快报,2008(10):98-99.
[4]蔡路军,马建军.预裂爆破减震机理及效果分析[J].中国矿业,2005(5):56-58.
[5]吴成双,孙吉坤,璩世杰.露天矿边坡大孔径预裂爆破研究与实践[J].工程爆破,2011(1):28-30.
[6]李洪涛.基于能量原理的爆破地震效应研究[D].武汉:武汉大学,2007.
[7]白金泽.LS-DYNA3D理论基础与实例分析[M].北京:科学出版社,2005.
[8]赵生伟,张颖,王占江,等.小当量水中爆炸冲击波实验及数值模拟[J].实验力学,2009,24(3):259-263.
[9]时党勇,李裕春,张胜民.基于ANSYS/LS-DYNA8.1进行显式动力分析[M].北京:清华大学出版社,2005.
[10]柴修伟,梁开水.水下炮孔爆破不同方向的水中冲击波传播特性研究[J].爆破,2012,29(1):19-22.