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Research on the Vibration Characteristic of Electronic Detonator Blasting for Water Diversion Tunnel |
CHENG Wei-feng , WANG Zhen-yu , CHEN Yin-lu, LIANG Xu , LIU Guo-hua |
Zhejiang University,Hangzhou,Zhejiang 310058,China |
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Abstract Research purposes:The shallow tunnels in urban areas, which are close to some surface buildings, are usually excavated by blasting because of line positions. Thus,the construction conditions are very complex. The vibration effects produced by blasting will endanger the safety of bulidings close to tunnels and will lead blasting accident disputes. This paper taking the shallow tunnel of Qiantang River diversion project as an example,the vibration characteristic of electronic detonator blasting and millisecond detonator blasting and their varying laws are studied so as to offer the basis for the decision-making on controlled blasting under complicated environment conditions.
Research conclusions:For the research on the analysis of measured data of blasting vibration,some useful results can be concluded. Firstly, the maximum vibration velocity of Electronic Detonator Blasting(EDB ) is smaller than that of Millisecond Detonator Blasting(MDB ),and EDB has a relative short sustained time. Secondly,the wave of EDB is well-distributed and steady. The frequency coverage of EDB is wider and has multiple peaks, the high-frequency components of EDB are more abundant than that of MDB. The time-energy density curve of EDB does’t have the abrupt and separated fluctuation,which indicates the interference and superposition of EDB are very distinct. Moreover Electronic Detonator has high precision and good safety performance,and it can effectively improve the blasting effect and reduce the consumption of explosives. The controlled blasting and tunnel support measures of this project have achieved a good effect, which provide the valuable reference to the study on controlled blasting for shallow tunnels in urban areas.
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Received: 22 November 2013
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