高鐵列車於橋樑結構引致地盤振動之評估

Evaluation of Ground Vibration as Induced by High-Speed Trains on Bridge Structures

陳國彥(Kuo-Yen Chen)

指導教授 ： 陳逸駿

中原大學/工學院/土木工程學系/碩士(2008年)

https://doi.org/10.6840/cycu200900258

摘要

本研究藉由量測高鐵於橋樑結構所引致的振動資料進行回饋分析，量測地點包含不同的土層形式及基礎型式。對於衰減之分析，利用列車經過時所量測各測點之振動速度，取前5%質點速度與頻譜圖下的整體振動量分別來進行地盤振動衰減的分析，對於衰減的評估方法則利用一般常用的Bornitz法及Wiss法，本研究同時將頻率因素納入評估分析中。
經由分析結果可發現高鐵之振動分析採用線振源較點振源適合。振動衰減於淺基礎明顯高於深基礎，但深基礎於不同土層的衰減結果則顯示較複雜的行為。另外針對1/3八音階頻率分為低(1~8 Hz)、中(10~25 Hz)、高(31.5~100 Hz)等，各分析其衰減係數可更精確評估高鐵振動衰減的合理性。
本研究最後利用數種可能之預估方法來預測高鐵振動，藉由不同的預估方法可以了解其預測結果的差異性及可靠度，可供工程界於計畫案例初步評估之用。

關鍵字

地盤振動點振源 ； 橋樑結構 ； 高鐵

並列摘要

This study evaluates the behavior of the ground vibration as induced by high-speed trains on bride structures. Four sites with different soil types and foundation types were measured and analyzed in this study. For the evaluation of the vibration attenuation, both 5% of peak particle velocity from the measured vibration data and the overall vibration level of spectrum were used for analysis. Meanwhile, the attenuation analysis consist of both Bornitz and Wiss methods. The frequency factor is also considered in the evaluation of vibration attenuation.

Based on these analyses, the use of line-load source presents better results than point-load source for high-speed trains on bridge structures. The coefficients of attenuation for shallow foundations are much higher than for deep foundations. However, the attenuation for deep foundation in different soil types shows more complicated behavior. Three frequency ranges, including low frequency range (1 to 8 Hz), mid frequency range (10 to 25 Hz), and high frequency range (31.5 to 100 Hz) are further divided for analysis, and the suggested method for different frequency ranges can more precisely predict the vibration level.

Finally, several existing prediction methods are used and compare with the measured results. The difference of these prediction methods is given and the use of prediction method for engineering practice is also suggested in this report.

並列關鍵字

ground vibration ； bridge structures ； high-speed trains

參考文獻

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