可液化夹层场地盾构隧道地震响应数值模拟研究

IF 1.9
Lianjin Tao, Shuya Li, Jing Pan, Bohan Song
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引用次数: 0

摘要

地震荷载作用下的土体液化对盾构隧道的结构安全构成重大威胁,特别是处于可液化层间地基中的盾构隧道,更容易发生严重的破坏。本研究采用CycLiqCPSP模型建立了饱和土-盾构隧道二维相互作用框架,研究了5种可液化土层空间构型下盾构隧道的地震响应。采用共振柱试验和三轴试验对北京地区可液化土的本构模型参数进行了标定,并通过单元试验模拟验证了本构模型参数的准确性。结果表明,与均匀液化土中的盾构隧道相比,可液化夹层的空间分布对土-结构相互作用体系的地震响应有显著影响。这种影响导致隧道结构的变形、内力和明显更高的破坏水平。当隧道基底穿越可液化层时,横向变形明显放大,结构破坏严重,是最不利的抗震设计情景。此外,在地震活动期间,双线隧道中段可能形成排水通道,增加了液化的风险。研究还显示,隧道后腰和脚趾处的内力和变形明显高于其他位置,需要特别注意这些区域的潜在损害。这些研究结果为强震下可液化层间地基盾构隧道抗震设计提供了重要的理论指导和科学见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Simulation Study on the Seismic Response of Shield Tunnels in Liquefiable Interlayer Site

Soil liquefaction under seismic loading poses a significant threat to the structural safety of shield tunnels, especially those located in liquefiable interlayered grounds, which are more prone to severe damage. This study employs the CycLiqCPSP model to develop a two-dimensional saturated soil-shield tunnel interaction framework, examining seismic responses of shield tunnels under five spatial configurations of liquefiable soil layers. Resonant column tests and triaxial tests were conducted to calibrate the constitutive model parameters for liquefiable soils in the Beijing area, and the accuracy of these parameters was validated through element test simulations. The results indicate that, compared with shield tunnels in homogeneous liquefiable soils, the spatial distribution of liquefiable interlayers has a significant impact on the seismic response of the soil-structure interaction system. This influence leads to increased deformation, internal forces, and significantly higher damage levels in the tunnel structure. When the tunnel's base crosses the liquefiable layer, lateral deformation is notably amplified, causing severe structural damage and representing the most adverse seismic design scenario. Additionally, during seismic events, drainage channels may form in the middle section of double-track tunnels, heightening the risk of liquefaction. The study also reveals that the internal forces and deformations at the tunnel's haunches and toes are significantly higher than at other locations, necessitating special attention to these areas for potential damage. These findings offer essential theoretical guidance and scientific insights for the seismic design of shield tunnels in liquefiable interlayered grounds under strong earthquakes.

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