Seismic performance study of immersed tunnel with longitudinal limit device of flexible joint

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
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引用次数: 0

Abstract

Flexible joints represent the most vulnerable aspect of the immersed tunnel, necessitating effective waterproofing and the transmission of forces between tunnel segments. However, the role of longitudinal limit devices in the seismic behavior of immersed tunnels is frequently overlooked in contemporary research on their seismic robustness. This study develops a longitudinal force model for flexible joints that incorporates the longitudinal limit device, building upon the beam-spring model of the immersed tunnel. Concurrently, a scaled partial experiment on the immersed tunnel’s flexible joint is undertaken, and validated and compared to the theoretical model. Subsequently, this model is utilized in the seismic assessment of the Ruyifang immersed tunnel. The computational findings revealed a considerable improvement in the seismic resilience of the immersed tunnel following the integration of longitudinal limit devices. With the incorporation of these devices, the opening of flexible joints diminished by 20% to 50% compared to scenarios lacking such devices. In addition, the peak acceleration of the tunnel segments’ mid-point structural response decreased by approximately 50%, accompanied by a significant reduction in the internal force response within the tunnel segments. As proposed in this research, the longitudinal force model for flexible joints under longitudinal limit devices represents the behavior of immersed tunnels under seismic stress more accurately. These numerical simulation outcomes also offer valuable insights for designing flexible joints in immersed tunnels.

带有柔性接头纵向限位装置的沉管隧道抗震性能研究
柔性接缝是沉管隧道最脆弱的部分,需要有效的防水处理,并在隧道各段之间传递力。然而,在有关沉管隧道抗震稳固性的当代研究中,纵向限位装置在沉管隧道抗震行为中的作用经常被忽视。本研究以沉管隧道的梁-弹簧模型为基础,建立了一个包含纵向限位装置的柔性接头纵向力模型。同时,还对沉管隧道的柔性接头进行了局部缩放实验,并与理论模型进行了验证和比较。随后,该模型被用于如意坊沉管隧道的抗震评估。计算结果表明,采用纵向限位装置后,沉管隧道的抗震能力大大提高。与未安装纵向限位装置的情况相比,安装了纵向限位装置后,柔性接头的开口率降低了 20% 至 50%。此外,隧道段中点结构响应的峰值加速度降低了约 50%,同时隧道段内的内力响应也显著降低。正如本研究中所提出的,纵向限位装置下柔性接头的纵向力模型更准确地反映了沉管隧道在地震应力下的行为。这些数值模拟结果也为沉管隧道中柔性接头的设计提供了宝贵的启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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.
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