两条减震沟对爆破振动效应的影响研究

Study on the Influence of Two Shock Absorption Ditches on Blasting Vibration Effect

从减震沟条数对爆破振动效应影响的角度,运用大型显式非线性动力分析软件LS-DYNA,分别对一条减震沟和两条减震沟两种工况的数值模型进行数值模拟,根据数值模拟分析结合相差比例对比分析了两种工况的爆破振动峰值振速的衰减规律。结果表明,两种工况爆破振动相差比例最大可达60%,并结合现场试验论证了两条减震沟工况降振作用明显优于一条减震沟,为降振方法的选取和后续研究提供了一定的依据。

From the point of view of the influence of the number of shock absorption trenches on blasting vibration effect,the numerical models of one shock absorption trench and two shock absorption trenches are numerically simulated by using LS-DYNA,a large-scale explicit non-linear dynamic analysis software.Based on the numerical simulation analysis and the difference ratio,the attenuation law of the peak vibration velocity of blasting vibration under the two conditions is compared and analyzed.The results show that the two conditions are different.The maximum difference ratio of blasting vibration can reach 60%.Combining with field test,it is proved that the vibration reduction effect of two vibration reduction ditches is obviously better than that of one vibration reduction ditch,which provides a certain basis for the selection of vibration reduction methods and follow up research.