Abstract
An experimental study and theoretical analysis were carried out to explore the ground-borne vibration generated by elevated high-speed railway in rock strata. Taking a typical rail line constructed on rock area in China as the research object, a set of field tests was performed on Rizhao-Lankao High-Speed Railway, the bridge and ground vibrations were measured as trains passed at 330–340 km/h, then the transferring law and spatial distribution under individual frequencies were investigated. The experiment results indicate that the bridge frequency spectrum exhibited relatively high-frequency vibration peaks caused by short-wavelength irregularity; ground vibration farther than 30 m away can be amplified with a higher frequency and numerous components. Furthermore, the wave propagation equation of a stratified rock strata was established based on direct-stiffness method to explore the vibration attenuation rules via frequency-domain analysis. It is found that the rock area has a weaker correlation between vibration transmissibility and frequency, thicker and harder rock strata loss their vibration attenuation capacity. It can be concluded that the high-speed railways induced vibration on rock strata shows a wide frequency band and large amplitude, the design of reducing vibration aimed at specific frequency is important according to next more detailed numerical study.
摘要
本文以典型基岩浅埋地层的日兰高铁为研究对象,在线路联调联试阶段对某32 m 简支梁桥区段展开现场测试。 采用时频方法对桥梁和地面振动响应进行分析,研究了弹性波在特殊地质条件下的传递规律与衰减特性。 结果表明:距离桥墩较远的30 m 范围之外的地面振动幅值出现放大现象; 岩石介质高速铁路环境振动具有宽频段、大幅值两大特征; 土-岩二元结构地层与岩石一元结构地层的系统传递特性差异较大,岩层越厚、等级越坚硬的岩石介质呈现振动传递率与频率的弱相关性,振动衰减能力下降。
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Project(2016YFE0205200) supported by the National Key Research and Development Program of China; Projects(U1734207, 51978585) supported by the National Natural Science Foundation of China
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WANG Ping provided the concept of manuscript. XING Meng-ting analyzed the calculated results and wrote the first draft of the manuscript. ZHAO Cai-you conducted the literature review and edited the draft of manuscript. WU Xue and KANG Xiu-shan analyzed the measured data. All authors replied to reviewers’ comments and revised the final version.
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XING Meng-ting, WANG Ping, ZHAO Cai-you, WU Xue and KANG Xiu-shan declare that they have no conflict of interest.
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Xing, Mt., Wang, P., Zhao, Cy. et al. Ground-borne vibration generated by high-speed train viaduct systems in soft-upper/hard-lower rock strata. J. Cent. South Univ. 28, 2140–2157 (2021). https://doi.org/10.1007/s11771-021-4758-y
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DOI: https://doi.org/10.1007/s11771-021-4758-y