Field test on vibrations of pile foundation and shaft structure induced by blasting excavation of a valve shaft
LIU Zengwei1，CAI Yuanqiang1，2，SHI Li2，SUN Honglei1
(1.College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China；2. College of Civil Engineering and Architecture，Zhejiang University of Technology，Hangzhou，Zhejiang 310014，China)
Abstract：The blasting excavation of water-division valve shaft may cause excessive vibrations to adjacent pile foundation and its superstructure，i.e. the shaft structure. Thus it is of great significance to analyze the vibration characteristics of the pile foundation and the superstructure. The velocity sensors have been mounted on the pile top，the bottom and the top of the superstructure，respectively. The vibration velocities were recorded at the three locations and then analyzed for each round of blasting. It is revealed that vibration response at the pile top is the largest during the cutting blasting，while vibration responses at the bottom and top of the superstructure become the maximum for the auxiliary-hole blasting and the surrounding-hole blasting. The vibration amplification effect exists at top of the superstructure，i.e.，its average peak vibration velocity is 4.2 times and 5.2 times those at the wall bottom and the pile top，respectively，when the ratio distance is greater than 15 m/kg1/3. The probabilities for the main blasting-vibration frequency exceeding 20 Hz are 99.26%，99.48% and 95.71%，respectively，for vibration velocities at the pile top，the bottom and the top of the superstructure. Therefore，the probability of structural resonance induced by blasting excavation of the valve shaft is extremely low.
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LIU Zengwei1，CAI Yuanqiang1，2，SHI Li2，SUN Honglei1. Field test on vibrations of pile foundation and shaft structure induced by blasting excavation of a valve shaft. , 2019, 38(S2): 3338-3345.
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2019, Vol. 38 
