Calculation and application of hole by hole blasting vibration superposition based on measured delay times of detonators

被引：0

作者：

Wu H. ^{[1
]}

Gong M. ^{[1
]}

机构：

[1] School of Civil and Envioronmental Engineering, University of Science and Technology Beijing, Beijing

来源：

Baozha Yu Chongji/Explosion and Shock Waves | 2019年 / 39卷 / 02期

关键词：

Millisecond blasting; Second free surface; Single-hole; Superposed vibration velocity;

D O I：

10.11883/bzycj-2017-0415

中图分类号：

学科分类号：

摘要：

It's important to calculate the superposed vibration velocity of multi-segments' millisecond blasting for low vibration velocity control in urban tunnels, but each segments of non-electric detonators have delay errors which can't be ignore in vibration's millisecond superposition under a low vibration velocity criterion. If each waves initiated one by one in consider of delay ranges between segments, it will forms a huge number of probable superposed vibration velocity curves which will result in no way to find a solution. To solve this, single-hole blast curve is took as wave of blast source, Fourier series is used to fit the curve. According to the measured time delay ranges of each segments' detonators, logical language is used to write MATLAB routine such as multistage nested loops, it is succeeded to get the probable superposed vibration velocity curves of 8 segments' millisecond blasting. The influence of the delay errors on the blast vibration is analyzed from the same segment and the different segments. The second free surface creation time is determined by compare the computed superposed vibration curve with measured blasting vibration curve. All the probable vibration curves are superposed within the delay ranges of each segments before the surface's formation, the maximum charge is selected as the designed one whose maximum peak result is safe. The application in a tunnel project shows that the second free surface created at 60ms and the maximum superposed vibration velocity is 0.62 cm/s by 1.0 kg design charge, which is in good agreement with the measured results in the field. © 2019, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.

引用

共 15 条

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