航道扩建工程水下炸礁爆破振动安全性判据研究

Study on safety criterion of underwater reef blasting vibration for channel expansion engineering

水下炸礁爆破作为航道建设、扩建和疏浚工程中的重要环节,也是影响整个工程效率和安全的主要因素。为了分析爆破影响因素对安全性判别的影响,进行现场监测研究,采用考虑振速-频率双重影响因素和考虑振速-频率-爆破持续时间三重影响因素的研究方法对现场监测结果进行对比分析,得到拟合公式及相应的拟合精度。结果表明,三重影响因素公式的拟合精度更高;水下爆破引发振动时应考虑爆破持续时间这个重要的影响因子;式(5)为适用于水下爆破工程安全性的最优判据法。

Underwater reef blasting,as an important link in waterway construction,expansion,and dredging engineering,is also the main factor affecting the efficiency and safety of the whole project.To analyze the influence of blasting effect factors on the safety discrimination,we carry out the study on the field monitoring,adopt double factors of velocity-frequency and blasting vibration speed-frequency-duration of blasting with triple factors in research methods to compare and analyze the results of the field monitoring and obtain the fitting formula and the corresponding fitting accuracy.The results show that the formula of triple factors has a higher fitting precision.The duration of blasting should be considered as the important effect factor when underwater blasting induces vibration.Formula(5)is the optimal criterion method suitable for the safety of underwater blasting engineering.