Field Test and Analysis on Subway Train Induced Vibration
With the development of society and the high-speed growing of urban population, traffic jam is becoming an increasing seriousness to people’s normal life. Subway construction as a result can be an efficient means to solve this problem. However, vibration
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Introduction Long-term vibration induced by subway train vibration can affect not only the structure of subway tunnel, but also the soil and superstructure around it. So it really necessary to understand the regularity of vibration’s propagating and damping properties. In the last few decades, many researchers all around the world have launched extensive and profound research on vibration induced by subway train. Pan Changshi and Li Dewu conducted a field measurement and a corresponding numerical simulation on Beijing subway tunnel in 1990 and discussed the influence of train vibration to the environment [1]. Bian Xuecheng developed a method of combining 2.5D finite element with boundary element, through which he analyzed the vibration in subgrade around tunnel [2, 3]. On the basis of field measurement, Zhang yu’e and Bai Baohong obtained an expression of track vibration acceleration induced subway train’s operation, deduced subway train’s vibration load which laid a foundation of analyzing train vibration load induced dynamic response of substructure [4]. Sun Xiaojing combined in situ measurement numerical simulation, laboratory test and theoretical analysis to present a comprehensive research of the vibration-induced influence on surroundings [5, 6]. Many scholars abroad have also done a lot of research on this. Kurzweil and Lang proposed a simplified prediction formula of vibration level changing with distance [7, 8]. Uger predicted the
H. Liu (&) J. Hu X. Bian Department of Civil Engineering, Zhejiang University, Hangzhou, China e-mail: [email protected] J. Hu e-mail: [email protected] X. Bian e-mail: [email protected] © Springer Nature Singapore Pte. Ltd. and Zhejiang University Press 2018 X. Bian et al. (eds.), Environmental Vibrations and Transportation Geodynamics, DOI 10.1007/978-981-10-4508-0_16
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vibration response induced by subway operation through determining the correction factor of different trains, tracks and tunnels [9]. In this paper, a field measurement of shield tunnel vibration induced by subway trains is conducted at Ningbo Metro Line 2. Subway train runs through the texting section at fixed speeds of 20, 30 and 40 km/h every other 10 min. At the same time, vibration measurements are undertaken till the vibration is small enough.
Field Text and Data Processing This text is undertaken in Ningbo Metro Line 2 before its commercial operation. As Ningbo is a city located in the southeast coast of China, the soil Ningbo Metro Line 2 crosses is mostly silt. Monolithic roadbed track is adopted in Ningbo Metro Line 2 which has good stability, strong integrity and long-term durability. The detailed structure is presented in Fig. 1. The width of track slab is 2.8 m, and track gauge is 1435 mm. The car running in this test is B2 type car with 6 carriages. The size of the car is shown in Fig. 2. A section has been selected between Qiuga Station and South Donghuan Road Station to install sensors according to the text conduction in the tunnel. Specific sensor-installing plan is s
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