自由面数量对爆破振动规律影响实验研究

Experimental Research on Effects of Free Surface Quantity on Blasting Vibration Laws

为研究自由面对爆破振动效应的影响,在黄土场地进行了不同数量自由面条件下的爆破振动测试实验。实验结果表明,自由面条件对爆破振动强度影响显著,即自由面数量越多,反映爆破振动强度的K值下降越多,衰减指数α也呈下降趋势。在炮孔近区,爆破振动速度衰减幅度更明显。

In order to study influences of free surface on blasting vibration effect, blasting vibration tests of different quantitative free surfaces were conducted at loess field. The test results showed that free surface had a remarkable influence on blasting vibration intensity. The more the free surface quantity increased, the more the value reflecting blasting vibration intensity went down, and attenuation index ct went also downtrend. Attenuate amplitude of blasting vibration velocity increased rapidly near the field of blasting hole.