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基于静力推覆试验的土体-沉管隧道反应机制研究

程新俊, 徐琨鹏, 景立平, 崔杰, 李亚东, 梁海安

程新俊, 徐琨鹏, 景立平, 崔杰, 李亚东, 梁海安. 基于静力推覆试验的土体-沉管隧道反应机制研究[J]. 岩土工程学报. DOI: 10.11779/CJGE20240022
引用本文: 程新俊, 徐琨鹏, 景立平, 崔杰, 李亚东, 梁海安. 基于静力推覆试验的土体-沉管隧道反应机制研究[J]. 岩土工程学报. DOI: 10.11779/CJGE20240022
The response mechanism of soil-immersed tunnel based on static pushover model test[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20240022
Citation: The response mechanism of soil-immersed tunnel based on static pushover model test[J]. Chinese Journal of Geotechnical Engineering. DOI: 10.11779/CJGE20240022

基于静力推覆试验的土体-沉管隧道反应机制研究  English Version

基金项目: 国家自然科学基金青年项目(52008081);国家自然科学基金重点国际(地区)合作研究项目(52020105002);国家自然科学基金地区项目(52168045);

The response mechanism of soil-immersed tunnel based on static pushover model test

  • 摘要: 目前地下结构静力推覆试验仅限于土层一致变形,缺乏面向土层相对变形作用时地下结构抗震分析的试验方法。为此,设计了局部推覆试验机制,开展了土体-沉管隧道静力推覆模型试验,重点分析了沉管隧道、场地土的变形与受力特征,揭示了接头失效模式,探讨了场地土-沉管隧道相互作用机制。试验结果表明:沉管隧道因柔性接头的作用,对场地的适应性强,随着土层相对变形的加剧,靠近推覆端与远离推覆端管节相同埋深处受到的土压力差最大可达71.6kPa,管节之间发生明显的相对位移;接头失效时,破坏现象主要集中在靠近推覆端管节剪力键处,其层间位移角达1/223,而远离推覆端管节仅为1/1024;场地土-沉管隧道相互作用主要经历了场地土挤密、土层相对变形迅速发展及接头失效三个阶段,场地土挤密阶段管节本体刚度维持较好,靠近推覆端与远离推覆端土-结构相互作用系数发展缓慢,土层相对变形迅速发展阶段管节之间发生明显的相对位移,靠近推覆端土-结构相互作用系数突破1,远离推覆端土-结构相互作用系数仍发展较缓,接头失效阶段,靠近推覆端土-结构相互作用系数可达3.1,远离推覆端土-结构相互作用系数仅为0.67。研究成果可为沉管隧道抗震性能分析与地震风险评估提供试验依据与技术支撑。
    Abstract: The static pushover test of underground structures mainly concentrates on consistent deformation of soil, with scarcely any studies considering soil dislocation. This paper proposes a regional pushover method. The static pushover model test of soil-immersed tunnel was conducted. The deformation and mechanical features of soil and immersed tunnel were carefully analyzed. The failure mode of the immersion joint and the soil-immersed tunnel interaction mechanism have been revealed. The test results show that the immersed tunnel exhibits strong adaptability to soil deformation owning to the flexible joint. With the increase of soil dislocation, the earth pressure difference at the same depth of two tunnel elements near and away from the pushover plate can reach up to 71.6kPa, and obvious relative displacement occurs between two tunnel elements. Structural failure phenomenon is mainly concentrated at the shear key of the tunnel element near the pushover plate, and the story shifts of the two tunnel elements near and away from the pushover plate are 1/223 and 1/1024, respectively. The soil-immersed tunnel interaction can be divided into three stages: soil compacting stage, rapid development of differential deformation stage, and joint failure stage. The stiffness of the tunnel element maintains well, and the soil-structure interaction coefficients obtained from two observation surfaces develop slowly during the soil compacting stage. Obvious relative displacement occurs between two tunnel elements during the rapid development stage of soil dislocation. Meanwhile, the soil-structure interaction coefficient that near the pushover plate exceeds 1. Furthermore, the soil-structure interaction coefficient that away from the pushover plate still develops slowly. The soil-structure interaction coefficients near and away from the pushover plate are 3.10 and 0.67, respectively, during the joint failure stage. The study can provide experimental and technical support for the seismic analysis and risk assessment of immersed tunnels.
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  • 被引次数: 30
出版历程
  • 收稿日期:  2024-01-07
  • 网络出版日期:  2024-12-23

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