Shaking table test on a tunnel-group metro station in rock site under harmonic excitation

IF 2.9 3区 工程技术 Q2 ENGINEERING, CIVIL
Ruozhou Li, Weiguo He, Xupeng Yao, Qingfei Li, Dingli Zhang, Yong Yuan
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Abstract

A tunnel-group metro station built in rock site is composed of a group of tunnels. Different tunnels and their interconnections can show inconsistent responses during an earthquake. This study investigates the dynamic responses of such a metro station in a rock site, by shaking table tests. The lining structures of each tunnel and surrounding rock are modeled based on the similitude law; foam concrete and gypsum are used to model the ground-structure system, keeping relative stiffness consistent with that of the prototype. A series of harmonic waves are employed as excitations, input along the transverse and longitudinal direction of the shaking table. The discrepant responses caused by the structural irregularities are revealed by measurement of acceleration and strain of the model. Site characteristics are identified by the transfer function method in white noise cases. The test results show that the acceleration response and strain response of the structure are controlled by the ground. In particular, the acceleration amplification effect at the opening section of the station hall is more significant than that at the standard section under transverse excitation; the amplification effect of the structural opening is insignificant under longitudinal excitation.

谐波激励下岩层中隧道群地铁站的振动台试验
建在岩层中的隧道群地铁站由一组隧道组成。不同的隧道及其相互连接在地震中会表现出不一致的响应。本研究通过振动台试验研究了岩石场地中此类地铁站的动态响应。每个隧道和围岩的衬砌结构都是根据相似律建模的;泡沫混凝土和石膏被用来建模地面-结构系统,保持相对刚度与原型一致。采用一系列谐波作为激励,沿振动台的横向和纵向输入。通过测量模型的加速度和应变,可以发现结构不规则造成的不一致响应。在白噪声情况下,通过传递函数法确定了场地特征。测试结果表明,结构的加速度响应和应变响应受地面控制。其中,在横向激励下,站厅开口部分的加速度放大效应比标准部分更为显著;在纵向激励下,结构开口的放大效应不明显。
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来源期刊
CiteScore
5.20
自引率
3.30%
发文量
734
期刊介绍: Frontiers of Structural and Civil Engineering is an international journal that publishes original research papers, review articles and case studies related to civil and structural engineering. Topics include but are not limited to the latest developments in building and bridge structures, geotechnical engineering, hydraulic engineering, coastal engineering, and transport engineering. Case studies that demonstrate the successful applications of cutting-edge research technologies are welcome. The journal also promotes and publishes interdisciplinary research and applications connecting civil engineering and other disciplines, such as bio-, info-, nano- and social sciences and technology. Manuscripts submitted for publication will be subject to a stringent peer review.
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