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.
引文
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