关键词: 抗力体, 爆破开挖, 振动监测, 锦屏一级水电站

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