航道整治水下钻孔爆破振动传播规律试验研究

Experimental study on vibration propagation law of underwater drilling andblasting for waterway regulation

航道整治水下钻孔爆破振动传播规律同时受高程效应和水体波动效应影响。根据某航道整治工程13组水下钻孔爆破振动试验结果,分析水下钻孔爆破振动速度和振动频率的传播规律,探讨能同时反映高差和水体波动影响的水下钻孔爆破振动预测公式。结果表明:1)采用三向分量中的最大值开展爆破振动速度预测的精度最高。2)垂直向Z分量主振频率随距离增大而衰减的规律显著,在爆破安全监测实践中应重点关注。3)与萨道夫斯基公式、仅考虑高程效应的修正公式和仅考虑水体波动效应的修正公式相比,同时考虑高程效应和水体波动效应的修正公式预测精度最高,且回归方程和回归系数显著,能够更准确反映水下钻孔爆破振动传播规律。研究结论对航道整治水下钻孔爆破振动安全监测工作具有借鉴意义。

The propagation law of underwater drill hole blasting vibration for waterway regulation is affected by elevation effect and water fluctuation effect at the same time.According to a waterway regulation project 13 groups of underwater drilling and blasting vibration test results,this study analyzes the propagation law of underwater drilling and blasting vibration velocity and vibration frequency,and explores the underwater drilling and blasting vibration prediction formula that can reflect the effect of elevation and water fluctuation at the same time.The results show that:1)The highest accuracy of blasting vibration velocity prediction is carried out by using the maximum value of the three-way component.2)The main vibration frequency of the vertical Z-component attenuates with increasing distance,which should be paid attention to in the practice of blasting safety monitoring.3)Compared with Sadovsky formula,the modified formula considering only elevation effect and the modified formula considering only water fluctuation effect,the modified formula considering both elevation effect and water fluctuation effect has the highest prediction accuracy,and the regression equation and regression coefficient are significant,which can more accurately reflect the vibration propagation law of underwater drilling and blasting.The research conclusions have reference significance for the safety monitoring of underwater drilling and blasting vibration in waterway regulation.