从地下列车到多层建筑的振动传递:建模和现场测试数据验证

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL Underground Space Pub Date : 2024-07-15 DOI:10.1016/j.undsp.2024.04.004
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引用次数: 0

摘要

地下列车引起的过度振动已成为城市中一个严重的环境问题。为了研究从地下列车到附近建筑物的振动传递,我们开发了一个显式积分时域三维有限元模型。在该模型中,地下列车、轨道、隧道、土层和附近的典型多层建筑都是完全耦合的。涉及轨道部件和建筑物的复杂几何形状都被详细模拟,这使得从地下列车到建筑物的振动传递模拟更加逼真。该模型通过现场测试数据进行了验证,数值结果与实验结果在时域和频域上都取得了良好的一致性。提出的模型被用于研究建筑物沿楼层的振动传递以及土壤刚度对轨道-隧道-土壤-建筑物系统振动特性的影响。研究发现,地下列车诱发的建筑物振动在 P2 共振决定的频率上占主导地位,并受到建筑物振动模式的影响。由于高频内容和局部模态的损失,从地基到顶层,建筑物的垂直振动以波动模式减小。由于局部刚度不同,同一楼层不同房间的振动水平也会不同。空间较大、局部刚度较小的房间通常振动水平较高。较软的土层会使隧道衬砌和建筑物产生更多的低频振动。研究发现,土层刚度对建筑物各层振幅的影响是非线性的,且与频率有关,这需要进一步研究。
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Vibration transfer from underground train to multi-story building: Modelling and validation with in-situ test data

Excessive underground train-induced vibration becomes a serious environmental problem in cities. To investigate the vibration transfer from an underground train to a building nearby, an explicit-integration time-domain, three-dimensional finite element model is developed. The underground train, track, tunnel, soil layers and a typical multi-story building nearby are all fully coupled in this model. The complex geometries involving the track components and the building are all modelled in detail, which makes the simulation of vibration transfer more realistic from the underground train to the building. The model is validated with in-situ tests data and good agreements have been achieved between the numerical results and the experimental results both in time domain and frequency domain. The proposed model is applied to investigate the vibration transfer along the floors in the building and the influences of the soil stiffness on the vibration characteristics of the track-tunnel-soil-building system. It is found that the building vibration induced by an underground train is dominant at the frequency determined by the P2 resonance and influenced by the vibration modes of the building. The vertical vibration in the building decreases in a fluctuant pattern from the foundation to the top floor due to loss of high frequency contents and local modes. The vibration levels in different rooms at a same floor can be different due to the different local stiffness. A room with larger space thus smaller local stiffness usually has higher vibration level. Softer soil layers make the tunnel lining and the building have more low frequency vibration. The influence of the soil stiffness on the amplification scale along the floors of the building is found to be nonlinear and frequency-dependent, which needs to be further investigated.

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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
期刊最新文献
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