台阶爆破空孔和预裂缝减震效果研究  

Analysis of Damping Effect of Empty hole and Pre-splitting Crack of Bench Blasting

作　　者：张袁娟[1] 孙文标[1] 赵强 ZHANG Yuan-juan;SUN Wen-biao;ZHAO Qiang(Department of Safety Engineering , Henan Institute of Engineering, Zhengzhou 451191 , China;The Northern Blasting Technology Co. , Ltd. ,Beijing 100089 , China)

机构地区：[1]河南工程学院安全工程学院,河南郑州451191 [2]北方爆破科技有限公司,北京100089

出　　处：《煤》2017年第4期1-3,12,共4页Coal

基　　金：国家自然科学基金(51104111);河南工程学院博士基金(D2013022);河南省教育厅科学技术研究重点项目(14B440005);郑州市科技攻关项目(141PPTGG375)

摘　　要：减震措施的选择对降低爆破振动有重要的作用。为了对比分析空孔和预裂缝的减震效果,运用大型动力分析软件LS-DYNA分别对台阶爆破设置预裂缝和空孔的工况进行数值模拟。首先,从峰值振速的角度进行分析,得出预裂缝减震效果佳,两种工况减震效果相差比例最高可达约55%;其次,从波振理论的角度进行分析,预裂缝增加了振动波的传播距离,也增加了振动波的反射,故减震效果佳,论证了数值模拟结果分析的正确性;最后,数值模拟结合波振理论得出预裂缝减震效果佳的结论。文章的理论分析方法结合现场工况为设置减震措施提供一定支持。The selection of damping measures has important role in reducing the blasting vibration.In order to compare and analyze thedamping effect of the air hole and the pre crack,the large dynamic analysis software LS-DYNA is used for the numerical simulation ofthe bench blasting.First,from the angle of the peak vibration velocity,it is concluded that the damping effect of the pre-splitting crackis better,the effect of the difference of two kinds working conditions is up to about55%;Second,from the angle of the theoiy of wavevibration analysis,the pre-splitting crack increases the vibration wave propagation distance,also increases the vibration wave reflection,so the shock absorption effect is good,and proves the correctness of the numerical simulation results analysis;Finally,the numericalsimulation combined with the wave vibration theoiy,the results show that the pre-splitting crack damping effect is better.Inthis paper,the theoretical analysis method combined with the site conditions will provide some support for the field setting vibration reductionmeasures.

关 键 词：空孔 预裂缝 峰值振速 LS-DYNA 减震效果 

分 类 号：TD235.[矿业工程—矿井建设]