Summary on the Monitoring of Vibration Caused by Blasting Excavation of Force-resisting Mass on the Left Bank of Jinping First Stage Hydropower Project

ZHAN Xue-jun; WU Cong-qing; LEI Ji-fei; ZHENG Yuan-fu

doi:10.3969/j.issn.1001-5485.2014.11.0362014,31(11):189-194

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Journal of Changjiang River Scientific Research Institute ›› 2014, Vol. 31 ›› Issue (11) : 189-194. DOI: 10.3969/j.issn.1001-5485.2014.11.0362014,31(11):189-194

ENGINEERNG DESIGN AND CONSTRUCTION MONITORING

Summary on the Monitoring of Vibration Caused by Blasting Excavation of Force-resisting Mass on the Left Bank of Jinping First Stage Hydropower Project

ZHAN Xue-jun, WU Cong-qing, LEI Ji-fei, ZHENG Yuan-fu

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Abstract

On the basis of measuring particle vibration velocity and macroscopic investigation of the force-resisting mass on the left bank of Jinping first stage hydropower project, we proposed the empirical formula of vibration spread regularity and the measures of controlling blasting vibration of the adjacent tunnel’s newly casted concrete. Testing results show that vibration control for the drainage hole of dam foundation is crucial. If the maximum explosive quantity of single shot as well as the angle included between cut hole’s axial direction and tunnel’s axial direction are suitable, and if the excavation and supporting time is rationally arranged, the safety controlling standard can be met. But for the sake of safety, the maximum explosive quantity of single shot should be strictly controlled. Furthermore, blasting vibration control and factors affecting the peak vibration velocity are analyzed. This research is a reference for similar engineering excavation.

Key words

force-resisting mass / blasting excavation / vibration monitoring / Jinping first stage hydropower project

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ZHAN Xue-jun, WU Cong-qing, LEI Ji-fei, ZHENG Yuan-fu. Summary on the Monitoring of Vibration Caused by Blasting Excavation of Force-resisting Mass on the Left Bank of Jinping First Stage Hydropower Project[J]. Journal of Changjiang River Scientific Research Institute. 2014, 31(11): 189-194 https://doi.org/10.3969/j.issn.1001-5485.2014.11.0362014,31(11):189-194

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