Abstract
This paper mainly discusses the problem of ground-borne vibrations due to the planned line 8 of Beijing metro which passes under the National Measurement Laboratory. A lot of vibration sensitive equipments are placed in the laboratory. It is therefore necessary to study the impact of vibrations induced by metro trains on sensitive equipments and important to propound a feasible vibration mitigation measure. Based on the coupled periodic finite element-boundary element (FE-BE) method, a 3D dynamic track-tunnel-soil interaction model for metro line 8 has been used to predict vibrations in the free field induced by trains running at variable speeds between 30 km/h and 80 km/h. Four types of track structures commonly used on the Beijing metro network have been considered: (1) high resilience direct fixation fasteners, (2) Vanguard fasteners, (3) a floating slab track and (4) a floating ladder track. For each of these track types, the vibration isolation efficiency has been compared. The results of the numerical study can be used to predict vibrations in nearby buildings and to decide upon effective vibration countermeasures.
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Project supported by the National Natural Science Foundation of China (Nos. 50538010 and 50848046), and the Research Council of K. U. Leuven (Bilateral Project BIL07/07), Belgium
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Ding, Dy., Gupta, S., Liu, Wn. et al. Prediction of vibrations induced by trains on line 8 of Beijing metro. J. Zhejiang Univ. Sci. A 11, 280–293 (2010). https://doi.org/10.1631/jzus.A0900304
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DOI: https://doi.org/10.1631/jzus.A0900304
Key words
- Ground-borne vibrations
- Coupled periodic finite element-boundary element (FE-BE) method
- Track structure
- Vibration isolation efficiency