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http://dx.doi.org/10.12814/jkgss.2022.21.4.041

A Study on the Dynamic Effect Influencing to Urban Railway Structures by Vibration from Near-field Excavating Work  

Woo-Jin, Han (Department of Transportation Policy & Management & System Engineering, Korea National University of Transportation)
Seung-Ju, Jang (Dept. of Transportation System Engineering, Korea National University of Transportation)
Sang-Soo, Bae (Dept. of Transportation System Engineering, Korea National University of Transportation)
Seung-Yup, Jang (Dept. of Transportation System Engineering, Korea National University of Transportation)
Myung-Seok, Bang (Dept. of Transportation System Engineering, Korea National University of Transportation)
Publication Information
Journal of the Korean Geosynthetics Society / v.21, no.4, 2022 , pp. 41-53 More about this Journal
Abstract
In the excavation work like blasting/excavator work bordering on the urban railway, the dynamic safety of railway structures like tunnel, open-cut box structure and elevated bridge was investigated by numerical analysis in this study. The practically presented criteria on influential zones at the blasting work in the construction industry was numerically checked in cases of the precise vibration-controlled blasting (type II) and the small scale vibration-controlled blasting (type III) and it was shown that the criteria on blasting work methods needed to be supplemented through continuous field tests and numerical analyses. The influence of excavation vibration by mechanical excavators was especially investigated in case of earth auger and breaker. The numerical analysis of tunnel shows that the criteria on vibration velocities from the regression analysis of field test values was conservative. The amplification phenomenon of excavating vibration velocity was shown passing through the backfilling soil between the earth auger and the open-cut box structure. It was shown that the added-vibration on the superstructure of elevated bridge was occurred at the bottom of pile like earthquake when the excavator vibration was arriving at the pile toe. The systematic and continuous research on the vibration effect from excavating works was needed for the safety of urban railway structures and nearby facilities.
Keywords
Urban railway; Excavating work; Soil vibration; Blasting; Box structure; Elevated bridge;
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